Reference request: there are only two integer solutions to $2^{2a} + 3^{2b} = 5^c$.

I believe there are only two non-negative integer solutions to $$2^{2a} + 3^{2b} = 5^c.$$ The solutions I have are $a=1,b=0,c=1$ and $a=2,b=1,c=2$. I'm not certain this is correct. I'd like to know if there are other solutions, or if there a theorem that says these are the only solutions. For further context, I'm generating Pythagorean triples as $$(r^2 - s^2, 2rs, r^2 + s^2)$$ where $r$ and $s$ are powers of $2$ or $3$. The solutions above correspond to the $(3,4,5)$ and $(7,24,25)$ Pythagorean triples. Thanks for reading, Daniel


Which biological process causes the feeling of having "Butterflies in the body"?

If someone is under stress, he or she may feel a strange feeling in the belly; it can be said that he or she feels that butterflies spread through the belly.  For other emotional reactions like being in love, similar, but different feelings can be caused.  What causes this symptoms? Is it because of the muscle tension varies, is it an electric current through the nerves?


Continuity and existence of directional derivatives at all directions of a $f:\mathbb{R}^{2} \to \mathbb{R}$ given by $f(x,y)=\frac{2x^2y}{x^2+y^2}$

Let $f(x,y)=     \begin{cases}       \frac{2x^2y}{x^2+y^2} & if & (x,y) \neq (0,0) \\       0       & if & (x,y)=(0,0) .  \end{cases}$  (i) Prove the directional derivatives of $f$ exist in any direction at the point $(0,0)$.  (ii)¿Is $f$ continuous on (0,0)?  For (i) I took $u=(u_{1},u_{2}) \in \mathbb{R^{2}}$ such $\|u\|=1$ and $0=(0,0)$. So $$\lim_{t \to 0} \frac{f(0+ t u)-f(0)}{t}=\lim_{t \to 0}\frac{2(tu_{1})^2 (tu_{2})}{(tu_{1})^4+(tu_{2})^2}=\lim_{t \to 0}\frac{(t^2 u_{1}^2)(t^2 u_{1}^{2}) tu_{2}}{t^{4}u_{1}^{4}+t^{2} u_{2}^{2}}.$$ But I cannot find the limit when $t$ aproaches to $0$. Which by finding them I would prove the directional derivative exist at every direction right?  For (ii) I got the intuition $f$ is not continuous at $(0,0)$ so I took $\lbrace (\frac{1}{k},\frac{1}{k}) \rbrace_{k \in \mathbb{N}}$ and $\lbrace (\frac{1}{k},0) \rbrace_{k \in \mathbb{N}}$ which are two different sequences in $\mathbb{R}^{2}$ converging to $(0,0)$. However, $\lbrace f(\frac{1}{k},\frac{1}{k}) \rbrace_{k \in \mathbb{N}}=\lbrace \frac{1}{k^{2}} \rbrace_{n \in \mathbb{N}} \to 0$ and $\lbrace f(\frac{1}{k},0) \rbrace_{k \in \mathbb{N}} \to 0$. So maybe my intuition was not right? Can anyone help me end the proof of continuity or not continuity , please?


I have two equations like   \begin{equation} a \end{equation} \begin{equation} b \end{equation}   I need the equations to be numbered as (1a) and (1b). How to do that? Can anybody help me to solve this?


Regex to extract string between third and fourth underscore

How would I use regex to extract the string between the third and fourth underscore in the following example: 123456-AB_ABC_ABC123_Extract This_ABCDEFG  I tried ^(?:[^_]+_){3}([^_]+)  But it seems to return all of the characters up to the fourth underscore instead of starting after the third underscore like I imagined. What'd I miss there? Thanks!


I want to install Steam for Linux. As I have only 256gb SSD and not enough space for games, I'd like to install it (and all it's games) to a USB3 flash drive.  How to do that? Preferably using sudo apt-get install ****. Haven't find a way to specify the installation location.


Copying files with spaces in the name using a shell script

I am using this script to mv all the files from a shared directory to another directory:  cd /share while : do   for allfiles in $(find /share/ -maxdepth 1 -type f -iname "*" -mmin +1); do   sudo mv "$allfiles" /schoolstore/   done   sleep 15s done   But, I get error when a filen contains a space within its name, where can I fix the script to get it to work for all files name?


How to open multi terminal on Ubuntu server?

I have installed Ubuntu 12.04 LTS server .  How can i run more than .sh file in the same time  (opening more than terminal)  I can use it on desktop version but i use server version.  Is it possible? if yes how can do?


In The Force Awakens…      Rey is drawn to Luke Skywalker’s lightsaber, which gives her an intense series of visions. She sees Luke being betrayed by Han’s son, causing Luke to leave. She then immediately sees herself as a little girl screaming for her father not to leave her.    This pretty clearly tells us that …      Luke is her father. Especially since the movie ends with her reuniting with him.   So who is Rey’s mother?    Is there anything in the other movies or books about the identity of       Luke’s wife?


Impossible to select edge loops with shortcut

In Blender 2.8 it's impossible to select edge loops with Shift + Alt and left (or right) click. Why?


How to determine how reliable my logistic regression probability is?

When building a logistic regression, the probability of an observation belonging to a class can be calculated. But is there a way to determine how reliable that probability is? If the accuracy is of the model is low then how good is the probability?


Displaying tikzpicture code alongside it

I used the following code for displaying the tikzpicture code alongside it.  Is there an easy way to automate displaying the code (centered alongside the picture) without modifying it.  \documentclass{article} \usepackage{verbatim} \usepackage{tikz} \begin{document} \begin{tabular}{cc} \begin{tikzpicture} \draw[thick, blue] (1,0) -- (0,0) -- (0,1) -- cycle; \end{tikzpicture}  &  \textbackslash begin\{tikzpicture\}\\  & \textbackslash draw[thick, blue] (1,0) -- (0,0) -- (0,1) -- cycle;\\  & \textbackslash end\{tikzpicture\}  \\ \end{tabular} \end{document}


I'm not so sure what moderators are, but I know they are separated from other users by a diamond. I thought moderators are employees but from time to time I see someone without a diamond near his name who says something like this:     We have .....   Which conveys that he is a stackexchange employer.  Here is my question:  Are there moderators without a diamond?


Let $A_{n\times n}$ is Hermitian matrix,and $A_{n\times n}\neq I_{n\times n}$,where $I_{n\times n}$ is Identity matrix,  prove or disprove   $$4A^5+2A^3+A=7I$$  my try: if such this condition: then matrix $A$ Characteristic polynomial  $$4\lambda^5+2\lambda^3+\lambda=7$$ $$(\lambda-1)(4\lambda^4+4\lambda^3+4\lambda^2+4\lambda+7)=0$$  then I can't  since  Hermitian matrix :


what is the error in the following mysql statement

What is this error in MYSQL statment  mysqli_query($con,"INSERT INTO stores(name, store_type, hours, rating_txt, rating_star, address_id) VALUES (".$name.",".$store_type.",".$hours.",".$rating_text.",".$rating_star.",".$address_count.")"))


Align anchor tag to bottom of 2 div's without position absolute

So I've been working on a website now I have some subscription cards which show the features. Now I wanted the cards to always have the same size so I used display table and table-cell so that the smaller card always matches the height of the other card. But both cards have a button (I use anchor tags for button) and I want these to always be on the bottom of the div. But for some reason I can't get it to work. I do not want to use position absolute so I'm wondering are there any other ways to do it?  As you can see in this image I want the button of 'Free' to be on the same height as the one from 'Pro'   HTML

Free

$0.00/mo

Feature

Feature

Feature

                     Get started

Pro

$4.99/mo

Feature

Feature

Feature

Feature

Feature

Feature

Feature

Feature

                     Get started

   CSS  .pricing-row {   display: table;   width: 100%;   border-spacing: 50px; }  .pricing-card {   position: relative;   display: table-cell;   border: 1px solid #515151;   min-height: 100px;   border-radius: 10px;   border-top-left-radius: 15px;   border-top-right-radius: 15px;   text-align: center; }  .pricing-card > h3 {   width: 100%;   font-size: 1.5rem;   font-weight: 500;   background-color: #000;   color: #fff;   padding: 15px;   border-top-left-radius: 10px;   border-top-right-radius: 10px; }  .pricing-card > ul {   list-style: none;   color: #6c757d; }  .pricing-card > ul li {   margin: 5px 0px; }  .pricing-card > a {   display: inline-block;   text-decoration: none;   color: #ff7700;   border-radius: 5px;   border: 1px solid #ff7700;   width: 97.5%;   padding: 10px;   margin: 10px 0px; }  .pricing-card > a:hover {   transition: 0.3s;   color: #fff;   background-color: #ff7700; }  .pricing-value {   color: #4e575f;   font-size: 2.5rem;   font-weight: 500;   margin: 20px 0px; }  .pricing-length {   color: #6c757d;   font-size: 2rem; }   Thanks in advance


Why is there not a standardized email   regex? I was recently involved in a   project where we had a hickup where   the email passed our email regex but   failed when creating the MailMessage   object. A small error but it had   rather big consequences         Is the MailMessage constructor using a email regex when checking if   an email address is correct?   Why are there so many different versions of an email regex?         this is an ASP.Net application and we   used the System.Net.MailMessage object   This is a duplicate of


Which one is correct ─ "on time" or "in time"? Are both correct? If so, when is one or the other used? This has been very confusing to me. I have tried to thrash out a simple rule when one or the other could be used: "in time" could be used when you are able to take a one-off action (say "x") within due time; but, when "x" is not a one-off action ─ that is to say, is a continuous-kind of action ─ you use "on time" (or, in certain cases, even "before time") to say that "x" has been done within due time. The rule could be further explained by taking example of a train. When you refer to the running of a train, you say that the train is running "on time"; but when refer to the reaching of the train a particular station, you say the train reached the station "in time". I do not know if I am correct. Can anyone tell me if I am correct?


Unable to execute below query  Update tbl SET alias_seq= (Select seq from tbl where analysed_object = 'data' order by seq LIMIT 1)   getting below error     #1093 - You can't specify target table 'tbl' for update in FROM clause


trouble installing pygame on ubuntu 16.04 LTS

I had a hard time installing pygame on my ubuntu 16.04 LTS. I use python 3. these are the steps I took to install pygame:  1.first I installed pip:  sudo python3 get-pip.py   this is the output of running pip --version:  pip 10.0.1 from /usr/local/lib/python3.5/dist-packages/pip (python 3.5)    I executed the following commands:   sudo apt-get install python3-dev mercurial  sudo apt-get install libsdl-image1.2-dev libsdl2-dev libsdl-ttf2.0-dev   then I executed the following command:   pip install --user hg+http://bitbucket.org/pygame/pygame  and this is the result in terminal:  Collecting hg+http://bitbucket.org/pygame/pygame   Cloning hg http://bitbucket.org/pygame/pygame to /tmp/pip-req-build-hxy86__i abort: error: Connection reset by peer Command "hg clone --noupdate -q http://bitbucket.org/pygame/pygame /tmp/pip-req-build-hxy86__i" failed with error code 255 in None   and it fails to install pygame. what should I do??


What is the probability of a coin landing tails 7 times in a row in a series of 150 coin flips?

If you were to flip a coin 150 times, what is the probability that it would land tails 7 times in a row?  How about 6 times in a row?  Is there some forumula that can calculate this probability?


how to extend root (/) partition by freeing ext4 partition?

My root (/) partition is full and i want to extend my root file system by freeing extra memory present in other partition which is ext4.  How to free some space with ext4 allocation and how to extend that freed memory to root(/) part.?  Here is image showned by gparted.   And here is the output of df -h  Filesystem      Size  Used Avail Use% Mounted on /dev/sda1        19G   15G  2.9G  84% / none            4.0K     0  4.0K   0% /sys/fs/cgroup udev            2.0G   12K  2.0G   1% /dev tmpfs           396M  1.1M  395M   1% /run none            5.0M     0  5.0M   0% /run/lock none            2.0G  416K  2.0G   1% /run/shm none            100M   40K  100M   1% /run/user /dev/sda6       662G  132G  497G  21% /home   Please guide in doing this. Thanks in advance.


Can Arcane Abeyance allow you to cast a spell longer than one action in one action?

I recently did this in a campaign of mine and it... ruffled the DM's feathers to say the least. Arcane Abeyance is a 10th level Arcane Tradition for the Chronurgy Wizard that allows the caster to condense a 4th level spell or lower into a "mote":  When you cast a spell using a spell slot of 4th level or lower, you can condense the spell's magic into a mote. The spell is frozen in time at the moment of casting and held within a gray bead for 1 hour. This bead is a Tiny object with AC 15 and 1 hit point, and it is immune to poison and psychic damage. When the duration ends, or if the bead is destroyed, it vanishes in a flash of light, and the spell is lost. A creature holding the bead can use its action to release the spell within, whereupon the bead disappears. The spell uses your spell attack bonus and save DC, and the spell treats the creature who released it as the caster for all other purposes.  Emphasis mine. As one might tell from my profile, I'm a huge fan of the wonderfully balanced . The following occurred last night in our campaign:  Obnoxious, power-gaming Wizard and party come face to face with a horrible monster with many claws. With an initiative of 31 (because Chronurgy Wizard is wonderfully balanced), the Wizard releases his pre-prepared mote of Leomund's Tiny Hut and summons a hemispherical dome inside of the dungeon, blocking the exit with the party inside. Because Leomund's Tiny Hut allows for objects to pass out of the barrier but not in, the party peppered to death the poor monster without it having any ability to respond while the Wizard smoked his pipe wistfully. The monster, having no magical ability whatsoever, proceeds to waste its turns digging and attempting to dodge as the party massacres the creature in its own home.  My question is, was the above situation legal, RAW? Is this really allowed and can Arcane Abeyance allow for spells with long cast times to be shortened to a single Action?


I use following commands very often, and they're too long.  sudo /etc/init.d/kerio-kvc start sudo /etc/init.d/kerio-kvc stop   how can I create a shortcut command for them? something like sudo kerio start or sudo kerio stop


'int' object is not iterable while using "list.extend"

Hi could someone help with this code,i am getting the error: " 'int' object is not iterable " at line 28(A.extend(n)) since i am new to python i am unable to figure out a solution any help is appreciated   Edit:I tried append earlier and got a memory error earlier and was wondering if extend() was the correct way to add elements but it seems like I made a mistake and the ended up with a infinite loop  Thanks for the advice it really helped me   print("Ax^2+Bx+C") a = int(input("a")) b = int(input("b")) c = int(input("c")) i, j, k, l = 0, 0, 0, 0 A = [] C = [] B = [] ano = []   bno = []   no = 0 noc = 0   n = 2 a2 = a c2 = c  if (a != 1) or (b != 1): while i != 1:     while a2 % n == 0 and c2 % n == 0:         if a2 % n == 0:             a2 /= n             # A.extend(n)             no += 1         if c2 % n == 0:             c2 /= n             # A.extend(n)             no += 1     A.extend(n)     ano.extend(no)     no = 0     n += 1     if a2 == 1:         A.extend(1)         A.extend(1)           i = 1


Can we perform deleting object through a pointer to one of its base classes?

Does it cause UB if we define a virtual destructor? For intance:  struct A{ virtual ~A(){ } };  struct B : A { };  A *a = new B;   int main() {     delete a; //UB? }


How to update 17.10 from a 17.04 VM whose disk needs partitioning with GParted that's not installed?

I need to update a 17.04 VM of lubuntu running in Oracle VirtualBox to 17.10. When I try the update, there was not enough free space despite removing any data files (the VM disk was only 10G, so not much space to reclaim).   I successfully grew the VirtualBox .vdi file to many more gigs, but following the steps , I need to run gparted, which sadly is not on my 17.04 machine! It's a catch-22, because I can not install it since the (17.04) mirrors are no longer available anymore because it's EOL. Am I SOL?  I checked out   -  but it seems to apply to Windows (and is really complex).  Is there a solution which doesn't require a fresh install? I'd like to keep my config of the 17.04 if possible.    Edit: As I already pointed out, I know 17.04 is EOL.  is related but not a duplicate. I need to modify the partition of a drive to do an update, but can't get the software.


Not start a new page with scanty number of words, lines

This script   \documentclass{article} \usepackage{lipsum} \begin{document} \lipsum[1-5] \lipsum[6][1-2] \end{document}   produces the output    How can I avoid starting page 2 with such a scanty number of words, lines?


Partial sums for $\sum_{j=1}^\infty\frac{1}{3^j}$ and similar.

I'm trying to take the limit of a series involving $\sum_{j=1}^\infty\frac{1}{3^j}$ and thinking that this might have a partial sum representation.  Here it says that $\sum_{i=1}^n \frac{1}{3^{i-1}} = \frac{3}{2}(1-\frac{1}{3^n})$ is the partial sum representation for $\sum_{i=1}^n \frac{1}{3^{i-1}}$:    But how is this derived?


guards wont stop killing me in skyrim and i need help?

If i go to markarth my bounty is over 1000. I have yet to do the forsworn mission, and I don't even know what I did to receive that bounty. Still the guards keep killing me even if I just stand there when my weapon is sheathed. I just want to pay and do the other 4 missions i have there right now.


Should long paragraphs be aligned justified or just left aligned?

For better readability which would be better for long paragraphs: align-justified or aligned-left?  Reason for asking: Aligned justify gives a better visual appeal but many tutorial and learning sites do not align-justify. Why?


:(){:|:&};: How does this BASH fork bomb work in detail?

I have a very fragmentary understanding of shells, subshells, functions, background processes and therefore I am insecure in understanding how this fork bomb works in detail,   However I tell you how what I know:   :() Here the colon is simply an unusually looking function name {...} Here is described what the function is doing {:()} Here the function calls the next iteration of itself {:()&} Here the function calls itself and puts the next iteration of itself into the background of the shell ...;: The last colon is the starting point of the function's actual execution, what is before is just its definition   So, my basic understanding is, it is a recursive function, which works like a spawning machine, spawning copies of itself until the point the system can not proliferate social wellfare anymore.  But, I do not really understand in a visually way what is happening step by step.  For instance   :()|:()&  Why are both function callings combined through a pipe symbol? Is the fork bomb spawning in a linear fashion, a constant number of processes per time unit or is it more abombically exponential like the two function calls suggest.   Could some one provide additionally a visual step by step comic strip of the spawning process, no matter how sloppy?


Proving $\prod_{p\in \pi(m+1,2m)}p \leq {2m \choose m} $

Let $\pi (m,n)$ denote the set of prime numbers in the interval $[m,n]$  Show that $\prod_{p\in \pi(m+1,2m)}p \leq {2m \choose m} $.    My attempt: $${2m \choose m} =\frac{m!(\prod_{p\in \pi(m+1,2m)}p)(\prod_{q\in [m+1,2m]-\pi(m+1,2m)}q)}{(m!)^2}=\frac{(\prod_{p\in \pi(m+1,2m)}p)(\prod_{q\in [m+1,2m]-\pi(m+1,2m)}q)}{m!}$$  All I have to do now is explain why: $$\frac{\prod_{q\in [m+1,2m]-\pi(m+1,2m)}q}{m!} \geq 1$$  but I'm struggling with a formal proof.


How much detail to include for an award listed on a CV

I would like to have a section titled 'Awards/Honors' in my CV and I am confused about how much detail to include for the items in this section. Here are some formats and levels of detail I am considering:    Harry Potter scholarship. Hogwarts school of Witchcraft and Wizardry, Harry Potter scholarship. Hogwarts school of Witchcraft and Wizardry, Harry Potter scholarship: awarded to one student every year for demonstrated excellence in horcrux-gathering.   For certain things, I feel like the first does not include enough context, beyond some very well-known things (such as a Fulbright or Goldwater, neither of which I have received). For some particular names I have in mind the second looks pretty clunky and does not always fit on a single line. The third option is even clunkier, and might be perceived as an attempt to add fluff to inflate the CV. I am personally leaning towards the second option, but I don't know that it adds much value beyond the first option.   Is there an accepted way to list awards/scholarships? Should I even be listing them at all?  Some context. I am a PhD student in Mathematics and I will be on the academic job market this coming year. I am currently based in the US and intend to apply to jobs here as well as internationally if I find any that are interesting. I am wondering both about the CV I keep that lives on my professional website and the one I hope to send as part of my job applications.    Edited to add: The first couple of answers suggest that one might choose the format/level of detail based on the type/prestige of award. If I were reading a CV and came across inconsistent formatting within a section, I would find it quite jarring. Is this something that only worries someone mildly-OCD such as myself (I notice things like en-dashes and em-dashes) and therefore perhaps to not be worried about, or should I be careful about such things (e.g. consistency of formatting) when creating a CV?


What is the secondary part of a book/play title called?

It''s quite common for academic papers and such to have a short title intended to catch the casual browsers's interest, followed by colon and a longer more explanatory alternative.  I know  is a lousy example (I couldn't easily find a better/shorter one), but even so I'm sure this Catchy Title : Longer version conveying more information about the work format is also used in fictional works.  Is there a standard name for that secondary title. It's not really an "alternative title". The only thing that comes to mind for me is , but I know that's not right either.


Do you have to cast Shield prior to your opponent's attack roll?

The entry for Shield says that the reaction is triggered by being hit by an attack, which would tend to imply that you can wait to see if your opponent actually succeeds on their attack roll (otherwise they would not be hitting you with their attack) to beat your AC before deciding whether or not to cast the spell. However, wouldn't that be considered meta gaming? After all, my character does not know whether the attack will hit or miss; only that he or she is being attacked.


Java like statement of condition?a:b in python

Is there a way to make the print_str function be more concise and becomes one line?      def print_str(str):         if len(str)>0:             print(str + ", "+ "hi")         else:             print("hi")     if __name__ == '__main__':         print_str(("John"))         print_str((""))   In java we can do something like  print(str + (str.equals("") ? "" : ", ") + "hi");


Can't install libsfml-dev on 16.10; unmet dependencies

I'm new to Linux, but I'm really interested in learning it and using it as my main development platform. I'm running into trouble, though, installing a library I use in my projects.  Whenever I try to install SFML with sudo apt-get install libsfml-dev I end up with an error:  The following packages have unmet dependencies: libsfml-dev : Depends: libgl1-mesa-dev but it is not going to be installed or                         libgl-dev E: Unable to correct problems, you have held broken packages.   And if I try to sudo apt-get install libgl1-mesa-dev I get:  The following packages have unmet dependencies: libgl1-mesa-dev : Depends: libgl1-mesa-glx (= 12.0.3-1ubuntu2) but 12.0.6-0ubuntu0.16.04.1 is to be installed E: Unable to correct problems, you have held broken packages.`   Like I said, I'm new to Linux and have more or less no idea what I'm doing here. Any help would be greatly appreciated.  Thanks!


How to find fixed points for DES weak keys

Can someone explain me this  please I am a bit confused?  It's from a texbook I am reading (block cipher companion)  it says that:      each weak key has  $2^{32}$ fixed points $m$ where $\operatorname{DES}_w(m) = m$ ( $w$ is a DES weak key). In other words encrypting a fixed point gives exactly the same point. To see this consider the $2^{32}$ ciphertexts after 8 rounds of encryption for which the two 32 bit halves are equal. For a weak  DES key, the round keys of the eighth and ninth rounds are equal. Thus the intermediate texts after seven rounds and after nine rounds of encryption will be equal. Since the round keys of the 7th and the 10th rounds are equal, the intermediate texts after 6 rounds and after 10 rounds of encryption will be equal. Continuing like this it follows that the plaintext will be equal to the ciphertext.    Now did not quite get :   Why are there $2^{32}$ fixed points?  And why after the eighth round of encryption the two halves must be equal? What does the author mean by the intermediate texts exactly? And how are they being equal?   P.S.: This question is not asking for what the weak keys are. I am asking for "fixed points" not exactly weak keys. For this reason I think it is not a duplicate of any other question. There is one similar question to what I've asked for which I have checked and saw that no satisfactory answer has been given there either.  Here is the similar question with no proper answers:


I know how to do it in WinForms  byte[] binaryData = Convert.FromBase64String(bgImage64); image = Image.FromStream(new MemoryStream(binaryData));   but how do i do the same thing in WPF?


Why are water waves transverse or up and down?

why are  transverse? why aren't the Longitudinal?


I'm a graphic designer (at least I like to call myself that) specializing in illustration and vector graphics. I'm self-tauggt and I work with Photoshop, CorelDraw and Blender. I really want to get into web design but I have no idea where to start. Do I really need to get awesome at PHP/HTML5/CSS/Java/Flash to get anywhere in this field? Any blogs/websites that I can add to my RSS feed, magazines I can check out? Are there any good courses (online, free or paid) or books that would help me on my endeavour? Must-have software? I've tried to google the subject but couldn't really find anything meaningful and the courses I've stumbled upon are always coding-only. I've really been trying to tackle this myself but I guess it's time to admit defeat and seek help from people smarter than me. Thank you to anyone who decided to read this (and answer) and sorry for any language errors.


Deleted or Added Item does not get affected after save in Community Section

Previously I have posted a bug related to duplication selection community section. Anna Lear has corrected that issue. Now I got another issue in Add/Delete item.  When I try to delete any item. It gets deleted. I did not get any problem. But, after save the deleted item still shows in the list. It only removed after refreshing page. This happens also when I add a new item.  -Stack Overflow community has deleted from the list.   -After save community settings still Stack Overflow shows in the list.   I have noticed that some time it does not give any bug on add/remove item from community list. but, if you try to add and remove multiple time it happens.  EDITED: You can download and see the video. . The file is compressed in rar file.


I am having real dramas with getting any form of Ubuntu to load onto a server and I'm tearing my hair out... I have a server based on a Commell LV-67K mother board with 8Gb RAM that I am trying to get any install of Ubuntu on to burned through Etcher. The image USB loads fine gets up to the bit where it asks you if you want to try or install etc. you select install it runs its commands and the brings up the Beaver/Panther head screen... and that's it! No window to to continue the installation or anything like that. The ISO works as it should when I run it up through Parallels on my Mac and does all the things it should. I've tried different versions of Ubuntu, different HDD and nothing works...any ideas greatly received!


How to hide my Android WiFi hotspot from being detected?

I have a Samsung Galaxy Young phone and a 3G connection. I use my phone as a wireless modem, but I don't want other devices to find my WiFi hotspot when they search for WiFi. How can I stop other devices from seeing my hotspot?


Solve the equation $ { \sqrt{4+\sqrt{4+\sqrt{4-x}}}}=x $


I have 2 gb DDR3  1333mhz laptop ram and i want to buy another 4 gb ram DDR3 of 1333mhz but of differnt brand . so is it ok if only frequencies of 2 rams are matching or do i need to look into another parameters of RAM? I mean matching frequencies is suffice, even though brands are differnt?  Thanks in advance


I am trying to ssh to localhost, but it's asking for a password every time.   What I tried:   ssh localhost ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa  cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys


Can a monk/druid use Flurry of Blows while in wild shape?

In D&D 5e, can a monk/druid use the monk ability Flurry of Blows in wild shape?


I received 4 .mov files from a client that they want on their mobile website via SlideShowPro. Each original file was between 200 and 400 mb. I've gotten each one down to about 30 mb using transmageddon as described , but that's still really big for a mobile connection.   Is there any way to shrink them even further? Maybe it's the settings; I used Output Format = MPEG4, Audio = AAC, Video = H264 (which is what is suggested by SlideShowPro.)


Prove $$\sin x\ge x-\frac{x^3}{3!}$$ for $x\ge 0$.  I know that a calculus/continuity proof exists, but I am curious if this can be proved without that. Here is a sketch I have made.; we will use for $x\ge 0$;  $$\sin x\le x\le \tan x$$  proof of this see   I got a weaker bound : $$\tan\left(\frac{x}{2}\right)\ge \frac{x}{2}$$ $$\sin\left(\frac{x}2\right)\cos\left(\frac{x}2\right)\ge \frac{x}{2}\cos^2\left(\frac{x}{2}\right)$$ $$\sin x= x\left[1-\sin^2\left(\frac{x}{2}\right)\right]\ge x\left(1-\frac{x^2}{4}\right)= x-\frac{x^3}{4}$$ Thus $$\sin x \ge x-\frac{x^3}{4}$$ As you can see is there any way I can take this to strengthen the inequality, to get $$\sin x\ge x-\frac{x^3}{6}.$$ Also could this possibly be extended by strengthening inequality further to get the Taylor series. I think I am going too far!


Using SRTM Global DEM for Slope calculation

I have downloaded SRTM GDEM (~90m resolution). I am using ArcGIS 10. I have tried to use the Spatial Analyst tool to compute for slope. However, I cannot compute for the slope. The output values has only two ranges 0 and 0.1-90. I am not really sure what the problem is.


Can I make an object invisible in Cycles without letting the camera see what is behind it?

I would like my mountain to be invisible after rendering. And I want just Objects in front of it (like trees) to be seen, but not behind the mountain.


Do you have to give others a chance to say "Uno"?

I have a friend "J" who will say uno when you say uno to make you draw the the penalty. Does he have to give you a chance to say uno?


Why don't the effects of time dilation cancel out?

Say we have two objects: A and B. In A's IRF, B moves with velocity +v. Then, B undergoes time dilation, and from B's perspective, the passage of time for A has sped up. However, in B's IRF, A moves with velocity -v. Then, A undergoes time dilation, and from B's perspective, the passage of time for B has sped up. This is a contradiction, the passage of time in A can't have sped up relative to B. What am I missing?


Prove that every unbounded sequence contains a monotone subsequence that diverges to inifnity.

I think I have the basic framework for this proof, but I am having trouble putting everything together in a convincing way.    I plan on showing that by the definition, an unbounded sequence $(a_n)$ has infinitely many $n$ such that $a_n>M$ where $M>0$, for some natural number $n$. I'm not sure how it is implied that there exists some $a_{n_k}$ such that $a_{n_k}>M$ for some natural number $k$.  Let me know if I'm on the right track, and please help me string these ideas together!


What does ord38s08-in-f14.1e100.net mean?

This address with minor variations keeps showing up as a request to my system and I've been getting hacked. Is this how?


Compact operator maps weakly convergent sequences into strongly convergent sequences

I found the following property of compact operators in a proof, and I can't prove it.     Prove that if $T \in \mathcal{L}(E,F)$ is compact, and if $u_n \rightharpoonup u$ (the sequence converges weakly to $u$ in $\sigma(E,E^*)$) then $Tu_n \to Tu$ strongly in $F$.   I was able to prove that $Tu_n$ has a convergent subsequence ($u_n \rightharpoonup u$ implies that $(u_n)$ is bounded in $E$. Then, because $T$ is compact it must follow that $(Tu_n)$ must contain some strong convergent subsequence), but didn't manage to finalize the proof.  Any reference or hints are welcome.


The store says WINE is installed, but I don't see it in my apps, or an option to use WINE to open a .exe file.


Length of angle bisector in terms of sides.

If the bisector of $\angle A$ in triangle $ABC$ meets $BC$ at $U$, prove that $AU^2=bc(1-a^2/(b+c)^2)$. (Where a, b, c are sides opposite to $A, B, C$ respectively).   I am not able to do anything. A hint to solve this in pre college level will be appreciated.


Could we (as a couple) stay together in a hotel in Dubai?


Clojure - Side Effects Happening Out Of Order

While dabbling in Clojure I've written a very basic program to echo whatever the user types into it. However, it doesn't run in a way that I'm perceiving to be natural. Here's the code:  (defn goo []   (print "echo> ")   (def resp (read-line))   (print resp) )   I would expect the code to run like this (for me typing in foo as the input to read-line):  user=> (goo) echo> foo foonil   But instead, the echo and read-line is switched:  user=> (goo) foo echo> foonil   Why does this happen? Is there a subtlety I'm missing?  EDIT: From Joe's answer, the updated correct solution is:  (defn goo []   (print "echo> ")   (flush)   (def resp (read-line))   (print resp)   (flush) )   Also, the flushes aren't necessary if you use println instead of print.


My Question is clear. I know that there exists infinite groups with finite exponent, But I want an example of such a group.  Any idea?


How to check for missing drivers in Ubuntu 14

Can anyone can help me to know if need to install a driver in my notebook, and where to check to see what drivers are available to be installed?.


This question was asked in my topology quiz and I was unable to solve it and examiner don''t gave any solutions.  Question: Consider the following set of functions on $\mathbb{R}$.   A= The set of all functions on $\mathbb{R}$.  How can I prove that A has cardinality strictly greater than $\mathbb{R}$? I am unable to think of a reasoning and I will not be able to provide a attempt. Background: I have read set theory from 1st chapter of Munkres topology.


Manually editing raster to improve classification using ArcGIS Desktop?

I have a land cover classification derived from Landsat TM imagery - I created this classification using ENVI. I would like to edit individual and groups of cells in some areas of the classification in order to improve the accuracy of the output by comparing it with aerial imagery.  Is there a way, using ArcGIS Desktop, to manually edit large groups of cells by selecting them and assigning them to a new or existing class?   I am aware of merging methods based on class statistics, but the area I'm classifying has a high amount of spectral confusion due to thin cloud cover - it seems like a manual edit is the only way to go.


Consider $X = (a+b)^n-a^n-b^n$  where  $a$ and $b$ and $a+b$ are not divisible by $n$, $n>=3$ is positive and prime, $a \ne b$ and both are greater than 1.  By the binomial expansion we know $X$ is divisible by $n$, but how can we study whether $X$ is divisible by $n^2$ or other powers of $n$? Specifically I am interested to prove $X$ is NOT divisible by $n^2$, but I am not sure how to prove or disprove it.


Is there a ruler symbol in some LaTeX package?  I would like something similar to the clock symbol in the wasysym package.


What causes a steel gurney to accelerate towards an MRI machine?

What is the basic concept in electromagnetism that explains the MRI projectile effect in which steel objects such as gurneys crash into an MRI machine with a force that is sufficient to kill or severely injure a person?


Bulletin board doesn't show 3 featured questions at a time

We know that questions with  are visible throughout the network in the bulletin board i.e., The Yellow Box. Currently there are 3  questions out of which only two are visible on the side bar. New question with this tag i.e.,   is not visible to network wide audience.   On Science Fiction and Fantasy which has both hot meta posts and  from per site meta.    After two featured questions from Meta Stack Exchange, rest of the space is taken up by per site meta questions.  Following is from Movies & TV  which doesn't have a featured question from their per site meta.    Even though there is space for all question to get featured, third question is not shown.   This bug report is related to my old bug with a     Shog9 made changes to show featured questions throughout the network irrespective of the date the tag is added or the date they are created.   Despite this change, the number of questions shown in the community bulletin is limited to 2 only. The goal of the tag is to make the network users aware of the changes happening on Meta Stack Exchange but that is not fulfilled. Due to this the goal of addition of the tag will not be achieved.  Can this be fixed to show all the featured questions in the bulletin board?


Geotools: Unexpected result reprojecting bounding box to EPSG:3035

I have a bounding box given in EPSG:4326 and I want to reproject it into EPSG:3035. How should I be doing it?  Here’s what I tried:  try {     CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:4326");     CoordinateReferenceSystem targetCRS = CRS.decode("EPSG:3035");     MathTransform trans4326to3035 = CRS.findMathTransform(sourceCRS, targetCRS);     ReferencedEnvelope bounds4326 = new ReferencedEnvelope(5.0, 15.0, 47.0, 55.0, sourceCRS);     Envelope bounds3035 = JTS.transform(bounds4326, trans4326to3035);     System.out.println(bounds3035); } catch (Exception e) {     e.printStackTrace(System.err); }   Result:  Env[-917569.8210525657 : 536626.7649395498, 8365819.661985753 : 9500037.05372034]   But these coordinate values are not what I expected. Cross-checking in QGIS, the values should be approximately 3900000 : 4700000, 2600000 : 3600000. This makes sense, because the center of projection of EPSG:3035 is 10°E, 52°N and the false easting/northing is 4321000/3210000, so the reprojected bounding box should be around that.  My Geotools version is 15.1.


Does the +1 enchant bonus for masterwork weapons apply to enchantment cost calculation?

A weapon must be masterwork to be , it also must have +1 enhancement bonus before it can be enchanted. Does the +1 enhancement bonus* from being  apply?   Example Calculation: +1 Benevolent Rapier  Rapier         20gp   Masterwork    300gp  Benevolent   2000gp  Total:       2320gp  *Note: This is a non-magical bonus to attack rolls


I was wondering if the anyone has seen the people in the Walking Dead eat meat from animals. Are all animals infected so they can't eat any of them after they kill it, or if they catch a fish they are good to go and can eat it without any casualties? The same with deer, cows and pigs? I don't remember seeing them eat on the farm, maybe eggs. I thought I saw a zombie horse or maybe it was just being attacked it never showed the aftermath.


Install Ubuntu onto USB stick? (Not installer?)

I'm a total newbie, so sorry if this is a stupid question.  I was wondering if I could make a version of Ubuntu I could run straight from the USB stick. Not like the installer, but I'd plug it in and it would be a full version of Linux that saves my stuff and all of that.  At first I tried plugging in 2 USB sticks into my computer. One empty one, one with the installer, and install from one onto the other. The installation took a few hours but went fine. However, once it said it was going to reboot, the whole computer crashed. I let it sit for about ten minutes before turning off the PC. When I turned it back on, it seemed fine, but I couldn't boot the USB stick I just installed Ubuntu onto. I can still boot the installer USB fine (I'm actually using the "Try Ubuntu" feature on it to write this), but the installed one doesn't work.  Now I just want to know if there's a straight-forward, newbie-friendly guide on how to make a bootable Ubuntu stick. All the official ones I could find were just for putting the installer on a USB.  Thanks in advance!


Purpose of “ASCII text, with overstriking” file format

After downloading the source code for Bash, I was browsing through the doc directory and came across the following files:    is a regular  file used to build the man page.  is like a plain text version of the man page – only that it has the  liberally distributed throughout it.   These control characters are not displayed in the representation provided by the Git web interface but the  and examined in text editor such as Vim.  Running the file command on bash.0 prints the following output:  bash.0: ASCII text, with overstriking   I’ve never come across this file format before and I was wondering what its purpose is and how it’s used. Searching the Web for the phrase “ASCII text, with overstriking” hasn’t been very enlightening.


Proof Nonexistence of Surjective Function

If there is a nonempty set $A$ and the set of its subsets $P(A)$. How can I show that there is no surjective function $f: A \longrightarrow P(A)$? Tip: Observe the elements $a$ within $A$, for which $a$ isn't an element of $f(a)$ As far as I know it is pretty obvious that there is no such function, because there are much more objects in the image set than there are in the domain. So there is no function which has this characteristic, but that is not a formal proof. I hope this is not regarded as a stupid question. Thank you very much for your help!


If $R$ is a commutative ring, the nilpotents form necessarily an ideal of $R$?

This is an algebra question from an exam a few years ago:     Let $R$ be a ring, and let $N = \{a \in R: a^n = 0 \text{ for some } n \in \mathbb{N}, (n \text{ depends on } a) \}$. Prove or disprove: If $R$ is commutative, then $N$ is an ideal of $R$?   So, clearly $N$ is nonempty and it is easy to show that it is closed under multiplication. However, for showing that $N$ is closed under subtraction, I believe this is not possible for we do have that $R$ is commutative, however, we don't have that $R$ is of characteristic $p$ and so the freshman's dream is just that...a dream. So, I would conclude that $N$ is not an ideal. Am I right about this?  I don't really understand the solution given in:  and also isn't it not necessarily true that $a^m + b^n = (a+b)^{m+n}$?


How can I save specific cookies in Chrome but automatically delete all others (including those from the same domain) upon browser close or open?

How can I save one or more specific cookies in Chrome but automatically delete all others (including those from the same domain) upon browser close or open?  My original thought was to find a cookie extension which either:   Whitelisted a specific cookie and gave me the ability to delete all others at start up or shutdown  or Allows me to auto-import a cookie on start up, and use the Chrome cookie settings to remove them all at shutdown.   However the problem seems is that I can't find an extension that does what I want. There are extensions like Vanilla Cookie Manager which allow me to whitelist cookies for a specific domain and delete all others but this fails to accomplish what I need.  Are the extensions or other options which allow me to accomplish either of the above?


The order of variables in ANOVA matters, doesn't it?

Am I correct to understand that the order in which variables are specified in a multifactorial ANOVA makes a difference but that the order does not matter when doing a multiple linear regression?  So assuming an outcome such as measured blood loss y and two categorical variables   adenoidectomy method a, tonsillectomy method b.   The model y~a+b is different to the model y~b+a (or so my implementation in R seems to indicate).  Am I correct to understand that the term here is that ANOVA is a hierarchical model since it first attributes as much variance as it can to the first factor before trying to attribute residual variance to the second factor?  In the example above the hierarchy makes sense because I always do the adenoidectomy first before doing the tonsillectomy but what would happen if one had two variables with no inherent order?


Turning on a 5v circuit with an 3.3v control signal (from a Raspberry PI)

I want to run a NE555 timer in astable mode, but I only want it to turn on when a 3.3v is supplied, I want to make use of a transistor to do the switching.  At the moment i am using a 2N2222 transistor, but cant seem to get the design right. Can someone please help me to design the switching transistor.    Will this circuit work?


Getting java.lang.NullPointerException error when assigning values to an array of user-defined class

I'm trying to create a simple JavaFX application that switches between 2 screens, one where you can change the variables stored and one that just displays, I have a function defined in the main method that just returns a nullpointerexception when compiling the project in the error log it says its on the line that reads  taskList[i].setTaskName(taskNames[i]);   I tried adding an if statement, similar to the one for the section for the getTechAssigned method, because this variable will be constantly changing, while the taskName variable will be unchanged. I'm just not sure why it's coming up, here's the full code:   variable declarations  Button assignTask, finalizeTask;     FlowPane pane1, pane2;     Scene scene1, scene2;     Stage theStage;     String[] taskNames = {"Notes", "Paging", "Event Mgmt - Early",                            "Event Mgmt -Late", "Airhub 2DA", "Airhub 1DA"                           "GSSD", "GSSI", "GSSRR", "Publishing",                           "Check Holdovers", "Radio", "PTI Walkoff", "Phones                           1300"};     task[] taskList = new task[taskNames.length];     GridPane taskGrid = new GridPane();   function that is causing the error:  public void initializeTasks() {     for (int i = 0; i < taskList.length; i++) {         taskList[i].setTaskName(taskNames[i]);         Text t = new Text(taskList[i].getTaskName());         taskGrid.setRowIndex(t, i);         taskGrid.setColumnIndex(t, 0);          if(taskList[i].getTechAssigned() == null) {             taskList[i].setTechAssigned("Not Assigned");             }          Text r = new Text(taskList[i].getTaskName());         taskGrid.setRowIndex(r, i);         taskGrid.setColumnIndex(r, 1);         }      }


How can i use a bash command in python for example :  # ifconfig eth0 promisc   in code like :  import socket # the public network interface HOST = socket.gethostbyname(socket.gethostname()) # create a raw socket and bind it to the public interface s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_IP) s.bind((HOST, 0)) # Include IP headers s.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1) # receive all packages s.ioctl(socket.SIO_RCVALL, socket.RCVALL_ON) # receive a package print s.recvfrom(65565) # disabled promiscuous mode s.ioctl(socket.SIO_RCVALL, socket.RCVALL_OFF)   instead of s.ioctl because linux doesn't support this command ?


Can't calculate the integral $\int_0^{\pi/2}\ln(a^2\cos^2x+b^2\sin^2x)\,dx$

Let $I(a,b):= \int_0^{\pi/2}\ln(a^2\cos^2x+b^2\sin^2x)\,dx$  Calculate $I(a,b)$.  My attempt:  Define function $F(a,b,x)$ as following $\frac{\partial f}{\partial a}F(a,b,x)=\ln(a^2\cos^2x+b^2\sin^2x)$  Then $I(a,b):=  \int_0^{\pi/2}\ln(a^2\cos^2x+b^2\sin^2x)dx= \int_0^{\pi/2}\frac{\partial f}{\partial a}F(a,b,x)= \frac{\partial f}{\partial a}\int_0^{\pi/2}F(a,b,x)$  The last equality is done by using Leibniz integral rule, I must prove that the function is well defined in a 3-dimension cube.  Calculating F:  $F(a,b,x)=\int \ln(a^2\cos^2x+b^2\sin^2x)\,da$  Using the integral by parts, $u'=1, u=a, v=\ln(a^2\cos^2x+b^2\sin^2x), v'=\frac{2a\cos^2x}{a^2\cos^2x+b^2\sin^2x}$  $F(a,b,x)=uv-v'u=a\ln(a^2\cos^2x+b^2\sin^2x)\space-\space \int\frac{2a^2\cos^2x}{a^2\cos^2x+b^2\sin^2x}\,da= a{\ln(a^2\cos^2x+b^2\sin^2x)} \space-\space \int\frac{2a^2\cos^2x}{a^2\cos^2x+b^2\sin^2x}da= a{\ln(a^2\cos^2x+b^2\sin^2x)}\space-\space \int\frac{2a^2\cos^2x+b^2\sin^2x-b^2\sin^2x}{a^2\cos^2x+b^2\sin^2x}da= a{\ln(a^2\cos^2x+b^2\sin^2x)}-\int 1-\frac{b^2\sin^2x}{(a^2\cos^2x+b^2\sin^2x)}da$  And I am stuck.. I don't know how to handle that integral. I am not even sure I am solving it correctly..  Any tips?


Is there a tool in Ubuntu to automatically merge two images having a common strip? I need to scan a large image, which will not fit at once in the scanner. I was thinking about scanning it in two parts and hand-editing the result in Gimp to join them. But probably an automatic tool can do the same more quickly and better.  EDIT I think I may have not made my point clear. My difficulty is not aligning two images. My problem is that one has to compensate for the rotation or distortion introduced by the manual process of putting the sheet into the scanner, and an automatic tool should obtain more precise results at analyzing common patterns in the two images to rotate and align them seamlessly.


What are Ghostable and Unghostable Pages? Is there a listof pages which are Ghostable and Unghostable? How would I know whether a page is Ghostable or unghostable? If we just add a document to a Ghostable Page, will it be called as Unghostable?


The OR and 95% CI for logistic regression were very high!

I have done binary logistic regression for a dichotomous outcome and used 5 predictors (3 continuous and 2 dichotomous); one of the dichotomous predictor gave a big number of OR and 95% CI (108.28, CI= 6.64- 1764.6, $p < .001$). Is such a big number okay to report, or is something wrong? Sample size was 55 cases.  By the way, the continuous independent variables were linearly related to the logit of the dependent variable. I tested this Box-Tidwell procedure by adding the interaction terms between the existing continuous independent variables and their natural log transformations to the logistic regression, and they were nonsignificant.


PNG export from Gimp not keeping tranparency

Here are the steps I done:   Opened PNG (not transparent) Selected white areas that I want to make transparent. Layers > Transparency > Add Alpha Channel Deleted selected areas (I see transparency in GIMP) Saved as .xcf file. Exported as PNG (tried various format settings) Reopen PNG in Gimp or other software --> Background is always white, no transparency. Added a transparent layer behind my main image. Re-exported as PNG. (Optionally) tried changing "Lock alpha channel" on both layers. Reopened PNG in Gimp or other software --> Background is now always black, no transparency.   How do I actually export a PNG with transparency from Gimp ?


What is the difference between "in" and "at"?

While I know very well the difference between "on" and "in", or even between "on" and "above", I didn't get what the difference between "in" and "at" is, that many specific things strictly get just one of them (such as "at the university", "in the building", "in / at the morning".).   Is there a clear rule where to use this one (at) and where to use the second one (in)?


Are there wizards with speech impediments?

As we can see  inflection is very important in spell-casting.  Can lisping wizard cast a spell (without harm to himself)? Can someone with another pronunciation problem?  Can we find this type of wizard in books?


When to use \par and when \\, \newline, or blank lines

What is the difference between \par, \newline, \\ and blank lines? When should I use which one?


Chewbacca (Chewie to his friends) is the Wookiee in the original Star Wars trilogy.  We know his name because people other than he say his name.  Whenever he speaks, it's in growls and other noises, he can't verbalize Basic like the humans and C-3P0 can.  But, he also can't enunciate the name 'Chewbacca'.  Other Wookiees have the same issue, they have names that they obviously couldn't pronounce.  How does Chewbacca have that name, when he himself cannot pronounce it?


I am new to Ubuntu Linux. I installed 18.10 and recently upgraded to 19.04.  My laptop is multi OS with Ubuntu 19.04 & Windiows 7. I am facing a blank screen issue after selecting Ubuntu OS after booting. Despite of waiting for more than 30 minutes, nothing is happening. If I ran it with advance option then only I can see Disco Dingo desktop.  Please help.


How can I accept the Microsoft EULA agreement for ttf-mscorefonts-installer?

After a recent update, ttf-mscorefonts-installer prompted me to accept its license agreement.     ┌─────────────────┤ Configuring ttf-mscorefonts-installer ├─────────────────┐  │                                                                           │   │ TrueType core fonts for the Web EULA                                          │                                                                               │ END-USER LICENSE AGREEMENT FOR MICROSOFT SOFTWARE                             │                                                                               │ IMPORTANT-READ CAREFULLY: This Microsoft End-User License Agreement           │ ("EULA") is a legal agreement between you (either an individual or a          │ single entity) and Microsoft Corporation for the Microsoft software           │ accompanying this EULA, which includes computer software and may include      │ associated media, printed materials, and "on-line" or electronic              │ documentation ("SOFTWARE PRODUCT" or "SOFTWARE"). By exercising your          │ rights to make and use copies of the SOFTWARE PRODUCT, you agree to be        │ bound by the terms of this EULA. If you do not agree to the terms of          │ this EULA, you may not use the SOFTWARE PRODUCT.                              │                                                                               │                                  <Ok>                                         │                                                                           │   └───────────────────────────────────────────────────────────────────────────┘    Screenshot:   For some reason my terminal will not allow me to accept, or for some reason I am pressing the wrong hotkey...  I've tried every letter on the keyboard and Enter among others...  I'm sure there is a very simple and obvious solution to this.  I've also just tried to remove the package completely however the terminal states that due to the package not being correctly installed, I should reinstall the package before removing it.  Very frustrating!  Essentially, because I cannot successfully install this package, I can't really ever upgrade my system because I always have to end up terminating the terminal with the license agreement (thus the upgrade fails).


So this is something I was not expecting, this is very simple but not giving the results I expect.  I would expect doing a simple equation of 5.1 - 4.9 to return 0.2, but this does not appear to be the case. I can use the round function to work around it, but I just find it confusing that 5.1 - 4.9 = 0.19999999999999.  Could anyone advise why this happens, and the best way to work around it.  ' returns 1.1 myvalue = 5.1 - 4 msgbox myvalue  ' returns 0.6 myvalue = 5.1 - 4.5 msgbox myvalue  ' returns 0.3 myvalue = 5.1 - 4.8 msgbox myvalue  ' returns 0.19999999999999 myvalue = 5.1 - 4.9 msgbox myvalue  ' returns 9.999999999999996E-02 myvalue = 5.1 - 5 msgbox myvalue  ' returns 0.2 myvalue = Round(5.1 - 4.9,2) msgbox myvalue


Trying to find the name of a story about humanity having the power to collapse quantum states in their favour

So I never read it personally, but I recall hearing about a story set in the future in which it's discovered that as observation collapses quantum states, it's possible to - through cybernetic brain alterations - actively choose which way you want it to collapse, generally to make matters of odds turn out slightly in your favour/slight reality-altering powers.  As it turns out, humans' observational powers are unique, and other races in the galaxy are being gravely endangered as humanity makes observations regarding the rest of the universe that conflict with what they necessarily need to survive/exist. To remedy the situation, the aliens are apparently erecting a massive opaque sphere around the solar system.  I believe the plot proper has to do with someone trying to investigate the rise of some kind of virus capable of hijacking a person's will and directly controlling their observational powers, with the intent of using the collective observational power of millions to massively warp reality - I think just for anarchic reasons.  That's about all I can think of at the moment, I'd really appreciate it if anyone's heard of this.  And I am 99.999% certain this is not The Quantum Thief...


Show that any set of 7 distinct integers includes two integers $x$ and $y$, such that either $x-y$ or $x+y$ is divisible by 10. I'm trying to apply the pigeonhole principle, but haven't been able to come up with a convincing argument.   Though similar to , I think the difference between the two is enough to warrant a second post.


Linear programming - Maximizing negative objective function

How can I turn this into canonical form and then use the two-phase simplex method to solve it? Would I need to add slack variable AND surplus variables?  $$\max\quad -2x_1-x_2-x_3 \\ \text{subject to: }-x_1-x_3 \le -1 \\ -x_1+x_2 \le -2 \\ -x_2+x_3 \le -1 \\ x_1,x_2,x_3 \ge 0 $$  When I put it into the tableau with only slack variables there are no negative coefficients in the bottom room to find the column to pivot around.


How can I get past hitting "Continue" over and over?

I am trying to get my Windows 10 to detect my 2nd hard drive. For reference, I have an Alienware M17xR3 with 2 hard drives. The main hard drive is C:\ and the one I am trying to detect is B:\.  I found a way to do it , but this led to the screenshot below. I can't sit here and click Continue for every single file that it can't find. Can someone help me find a workaround?


Equal homomorphism on Z implies equal homomorphism on Q

An exercise from Hungerford's Algebra.     Let $\mathbb Q$ be the field of rational numbers and $R$ any ring. If $f,g:\mathbb Q\rightarrow R$ are homomorphims of rings such that $f=g$ on $\mathbb Z$, then $f=g$ on $\mathbb Q$.   The hint given by author asks me to show $f(1/n)g(n)=g(1)$, which is easy to check, and hence $f(1/n)=g(1/n)$, where I get stuck because I think $nf(1/n)=ng(1/n)$  may not imply $f(1/n)=g(1/n)$ since $R$ can have character $\neq0$.  Can anyone help me to figure it out?


Why didn't Ingrid grow up in Storybrooke but Henry did?

I was watching "Shattered Sight" in season 4 again, and I realized something. When Emma asks Ingrid the reason she didn't grow up, she said that no one grows up in Storybrooke.  But Ingrid was not cursed, just like Henry. So why did Henry grow up and she didn't?


A proposition is non-falsifiable. So what?

Does Karl Popper argue that non-falsifiable theories are not true/have no truth value, or simply that they are not provable? Put another way: according to Popper, could a non-falsifiable theory conceivably be true?   An answer citing a textual source would be welcomed...  Related:


Groovy adds the execute method to String to make executing shells fairly easy;  println "ls".execute().text   but if an error happens, then there is no resulting output.  Is there an easy way to get both the standard error and standard out?  (other than creating a bunch of code to; create two threads to read both inputstreams, then using a parent stream to wait for them to complete then convert the strings back to text?)  It would be nice to have something like;   def x = shellDo("ls /tmp/NoFile")  println "out: ${x.out} err:${x.err}"


Unable to boot Ubuntu in dual boot system - Error says kernel panic

I installed Ubuntu using a pendrive. Everything worked well the first time after which there was a request to update the system. Once the update happened (don't know what the update was for - I'm a first time Linux user), I'm unable to login to the system. It's a dual boot by the way and the windows 10 works just fine. Please advice. Attached is the pic of the error.


SQL Server 2016 Standard edition: licensing per core or per server/CAL

We've 1500 users (no connection from internet/extranet). This number is stable and will be stable. These users will use around 150 different databases each of them have not a really intensive workload and not really large (between 1Go and 100Go, total of 5 To). We want to use SQL Server 2016.  According to my calculations, I've the following possibilities:  Standard edition per server/CAL:    1500 CAL = 270k$ 10 servers = 10k$ (each with max. 24 cores = 240 cores) Total = 280k$   For the same amount, if I use the Standard edition per Core licensing model   280k$ / 3.8k$ (price per 2-cores) = 150 cores (around 6 servers)   and if I want to add an additional server, the first option will cost me only 1k$ and the second 40k$ (for 24-cores).  According to many info on the net, the per server/cal licensing is designed for company with a really low number of users (less than 30). But my calculations show that in my case I  should go for this type of license (and I've many more users).  I'm lost and I think there is mistake somewhere but can't spot it.    I misinterpreted the licences or missed something in the licensing model  I've too many servers for this potential workload and should go for less cores. 100 cores is probably more than needed to handle 1500 users and 5To according to your experience. Anything else?   Thx for sharing your expertise on this.


Why is the graph of 2logx different from log(x^2)?

According to Logarithmic exponent rules: log(x^y) = y ∙ log(x)  For example: 2 log x = log x^2  However take the following graphs:  y=2logx   y=logx^2   The graphs seems to display something that should not be the case, what am I missing or misunderstanding? I am quite confused.


How to know the model has started overfitting?

I hope the following excerpts will provide an insight into what my question is going to be. These are from .  The learning then gradually slows down. Finally, at around epoch 280 the classification accuracy pretty much stops improving. Later epochs merely see small stochastic fluctuations near the value of the accuracy at epoch 280. Contrast this with the earlier graph, where the cost associated to the training data continues to smoothly drop. If we just look at that cost, it appears that our model is still getting "better". But the test accuracy results show the improvement is an illusion. Just like the model that Fermi disliked, what our network learns after epoch 280 no longer generalizes to the test data. And so it's not useful learning. We say the network is overfitting or overtraining beyond epoch 280.  We are training a neural network and the cost (on training data) is dropping till epoch 400 but the classification accuracy is becoming static (barring a few stochastic fluctuations) after epoch 280 so we conclude that model is overfitting on training data post epoch 280.  We can see that the cost on the test data improves until around epoch 15, but after that it actually starts to get worse, even though the cost on the training data is continuing to get better. This is another sign that our model is overfitting. It poses a puzzle, though, which is whether we should regard epoch 15 or epoch 280 as the point at which overfitting is coming to dominate learning? From a practical point of view, what we really care about is improving classification accuracy on the test data, while the cost on the test data is no more than a proxy for classification accuracy. And so it makes most sense to regard epoch 280 as the point beyond which overfitting is dominating learning in our neural network.  As opposed to classification accuracy on test data compared with training cost previously we are now placing cost on test data against training cost. Then the book goes on to explain why 280 is the right epoch where the overfitting has started. That is what I have an issue with. I can't wrap my head around this. We are asking model to minimize the cost and thus cost is the metric it uses as a measure of its own strength to classify correctly. If we consider 280 as the right epoch where the overfitting has started, have we not in a way created a biased model that though is a  better classifier on the particular test data but nonetheless is making decisions with low confidence and hence is more prone to deviate from the results shown on the test data?


apt-get update: "Conflicting distribution of mono... Skipping acquire of configured file ... as repository 'mono' doesn't support architecture 'i386'"

When I ran sudo apt-get update, I got the following error at the end: W: Conflicting distribution: http://download.mono-project.com/repo/ubuntu stable-xenial/snapshots/5.12.0.226 InRelease (expected stable-xenial/snapshots/5.12.0.226 but got xenial) N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'https://download.mono-project.com/repo/ubuntu stable-focal InRelease' doesn't support architecture 'i386'  How can I resolve this?


Why can't a combination of two diodes connected back to back act like transistor?

I saw an explanation of the transistor working  by Bill Beaty. I absolutely loved it. But I'm not entirely sure why the action cannot be achieved by two diodes connected back to back by a metal piece in between. Here's what I'm thinking, Metal wire obviously has large number of charge carriers in it so any electron in base that accidentally enters the metal will cause a small current at the other end of the wire by pushing an electron into the collector region just like it happens in case of transistor. Where did I go wrong? And where does the mechanism fail exactly?


I'm having trouble dual-booting 12.04 alongside Windows 8. It's a self-assembled PC, so there's no OEM UEFI or anything like that (just to be safe, I checked the BIOS settings and it was set to legacy). So the problem is I boot from the live DVD, allow Ubuntu to carve out its own partitions (by selecting "install alongside Windows 8"), it proceeds to a screen where it tells me installation was successful, then a message pops up saying    "Executing 'grub-install /dev/sda' failed. This is a fatal error."   So I chose to finish the installation without a bootloader. Before I go further, here is the return for fdisk -l:  Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000     Device Boot      Start         End      Blocks   Id  System /dev/sda1               1  1953525167   976762583+  ee  GPT Partition 1 does not start on physical sector boundary.  Disk /dev/sdb: 60.0 GB, 60022480896 bytes 255 heads, 63 sectors/track, 7297 cylinders, total 117231408 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x89e1bf3c     Device Boot      Start         End      Blocks   Id  System /dev/sdb1   *        2048    86843397    43420675    7  HPFS/NTFS/exFAT /dev/sdb2        86845438   117229567    15192065    5  Extended /dev/sdb5        86845440   100560895     6857728   83  Linux /dev/sdb6       100562944   117229567     8333312   82  Linux swap / Solaris   I have it set up so that /dev/sda is my storage HDD with files accessible by both Ubuntu and W8. /dev/sdb is my SSD that I want to run both OSs on. /sdb1 is my existing Windows installation, sdb5 is the currently unbootable 12.04 installation, and sdb6 is swap.   What I have tried so far is deleting the partitions and redoing the whole thing, except initiating it by running   ubiquity --desktop %k gtk_ui   in sudo. No change in behavior. I have tried running grub-install in sudo and it completes successfully. However, when rebooting it boots what I would assume to be the GRUB terminal. Obviously the GUI form is preferable. Anyway, I'm a Linux noob, so I'm open to suggestions.


What happened to Otonashi and Kanade in the last episode?

In the last episode, Kanade graduated and disappeared. After that, there's a scene where Otonashi meets Kanade outside in the afterlife world. Did they reincarnate and meet again, or have they met before when they were still alive?


Lightning Components: What is the meaning and purpose of the scope parameter of Action.prototype.setCallback()?

Typically we use setCallback() to invoke apex methods from components like so  var call1 = cmp.get("c.myServerSideAction_1"); call1.setCallback(this,function(res)) {     if(res.getState()=='SUCCESS') {           // ... some logic here     } }); $A.enqueueAction(call1);   The documentation in the Aura Sourcecode suggests to use this as scope.  Now in the context of a different question I found that I'm passing in most cases null instead of this because I moved all invocations to a static resource where I have no meaningful this context to feed into setCallback().  Unfortunately I can't figure what the meaning and reason for this super strange scope parameter is at all. It feels just useless and as an obstacle to me and I passed null out of frustration. Surprisingly it worked with no difference. Now in the context of a differnt question here    about nested apex invocations I have performance issues and @CasparHarmer guessed the scope parameter could have an impact on performance.  I would like to understand scope  Can anyone point me to where I can read more about this scope or explain to me it's purpose? I can't find more background information on it.  This question is similar to this    but has actually received a better and more detailed answer.


What's the difference between Flat and Material design illustration? Even, Are they any different? For example, what can I call the picture below?


Is it possible to generate {!Community_Url} dynamically in the apex and then pass it on to VF email template? Does the link created programatically have the encrypted key to take the user to the password set screen and log them to the community?


Why is $\mathbb{Z}[\sqrt{-5}]$ an integral domain?

I could use some help with this.  I know that  $\mathbb{Z}[\sqrt{-5}]=\{a+b\sqrt{-5\} }|a,b\in\mathbb{Z}\}$. I then put $$0=(a+b\sqrt{-5})(c+d\sqrt{-5})=ac-5bd+(ad+bc)\sqrt{-5}$$ which leaves me with $$0=ac-5bd$$ and $$0=(ad+bc)\sqrt{-5}$$  now how do I proceed from here? I know that I have to prove $a+b\sqrt{-5}=0$ for $c+d\sqrt{-5}\neq0$.


Cannot edit email update schedule for Favorite Tags filter

When trying to edit my Favorite Tags email subscription from every 3 hours to daily I found that clicking the edit link does nothing. Digging into the issue a little, it seems that when clicking the edit link the code attempts to click on an element with class filter-edit but no such element exists in the source code. Favorite tags URL is  Screenshot showing the event handler:  Video attempting to show that clicking does nothing:  I've tried Chrome, IE, and Firefox.  All of them do nothing when clicking the link. I was able to edit the schedule by using the dev console to show the form manually then submit it.


Sorry, if this question is trivial...  There are two ways of initializing fields  For example:  The first way is:  Public class A{     int a;     A(){         a = 5;     } }   The second way is:  Public class A{     int a = 5;     A(){     } }   Which way is better? Why or why not?


Is there a tool for exporting equation images to TeX? Probably something related to OCR. I have a lot of image-equations in a word document that I'd like to convert to TeX.  Note that the equations are actually images, so no word2tex-like apps would help.


How to edit the Applications Menu in GNOME 3?

I am using Ubuntu 16.04, with Gnome 3.18. Using extensions I have gotten rid of the dash panel and only use the Applications Menu in the upper left-hand corner of the screen. (I don't have Unity.) What I can't figure out is how do you add a new program, move software around to different categories, and create new categories?  Also, any keyboard shortcut to access the Applications Menu?


How to pass raw data in API request using Retrofit2

I am trying to call login API using Retrofit2.  But in onResponse i alwasy get null as response.  Login API endpoint  @FormUrlEncoded  @POST("/api/login/{mobile}")  Call<ResObj> userLogin( @Field("phoneNumber") String mobile );   And the API implementation   private void doLogin(final String mobile){         Call<ResObj> call = userService.login(mobile);         call.enqueue(new Callback<ResObj>() {             @Override             public void onResponse(Call<ResObj> call, Response<ResObj> response) {                      ResObj resObj = response.body(); // here i am getting null response.body()                      if(resObj.getMessage().equals("true")){                          Intent intent = new Intent(Login.this, ListActivity.class);                         intent.putExtra("mobile", mobile);                         startActivity(intent);                      } else{                         Toast.makeText(Login.this, "Phone Number is incorrect!", Toast.LENGTH_SHORT).show();                      }                 }              @Override             public void onFailure(Call<ResObj> call, Throwable t) {                 Toast.makeText(Login.this, t.getMessage(), Toast.LENGTH_SHORT).show();             }         });      }   ResObj class:  public class ResObj {     private String message;      public String getMessage() {         return message;     }      public void setMessage(String message) {         this.message = message;     } }   I just want to  know what causes the error and what are possible solutions.  UPDATE  POSTMAN


How to provide a counterexample for if $n$ is prime, then $2^n -1$ is prime

I have the following question where I need to provide a counterexample     if $n$ is prime, then $2^n -1$ is prime   The statement is invalid and I now that $2^n -1$ is not prime when $ n = 11$, but other than plugging in prime numbers is there any other way to figure out whether $2^n -1$ is prime if $n$ is prime?


Cannot install Pulseaudio after upgrade to 18.04

I upgraded to 18.04 (actually it said partial upgrade) and now have no sound, I tried to install pulseaudio as it seems to be missing but I ge the message below.   dave@Dave-PC:~$ sudo apt install pulseaudio [sudo] password for dave:  Reading package lists... Done Building dependency tree        Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:  The following packages have unmet dependencies.  pulseaudio : Depends: libpulse0 (= 1:10.0-2ubuntu3.1) but 1:11.1-1ubuntu7 is to be installed E: Unable to correct problems, you have held broken packages. dave@Dave-PC:~$    How do I fix this?


Differences between "however", "although","albeit", etc

What are the differences between albeit, although, howbeit, however, and though?


If the scalar product is non degenerate then the metric matrix is invertible and symmetric : why?

I would like to know how to prove that if if the scalar product is non degenerate then the metric matrix is invertible and symmetric.  It is probably trivial, probably not but I really don't know how to prove it.  They define a non degenerate scalar product, a scalar product verifying :  $\forall w ~ \langle v |w\rangle =0 \Rightarrow v=0 $


How can I use Kinect for voice chat during gaming?

How do we use the Kinect to chat instead of a headset for game chat?  For example, using Kinect for chat while playing Call of Duty: Ghosts.


Update Manager message "New Hardware Support is Available"

I haven't seen this message from Update Manager before, and I have not been able to google up any info.  What will be installed when I click Install?  (Clicking "Description of Update" got me nothing...)


How do I open the Dahl chest in Sanctuary?

In the house with Tannis and the Safe in Sanctuary (the Crimson Raider hideout) there's a red Dahl branded chest behind a gate. There's a green-lit switch to the left of the door but pulling it doesn't work. Later on in the story the switch turns red and won't turn, I still can't get into the gate.  How do I open the gate and get to that chest?


Why root cannot access ".android_secure" directory on external SD card?

I have an Android 9 tablet, rooted by way of Magisk. It has an external SD card mounted as sdfat on /mnt/media_rw/1234-5678 which is mounted on four other mount points, all as type sdcardfs, with some variation in owner and group.  From a terminal window I type ls -al /storage/1234-5678. Lots of files and directories are shown with one error message:  ls: permission denied: .android_secure   I try as root. I get the same result. Using /mnt/media_rw/1234-5678 and root, I can see the entry for .android_secure. I'm told that .android_secure itself is empty.   The external SD card is FAT32.  Anything on it has the same set of permissions.  How is .android_secure different from everything else on the card? Even if .android_secure has different permissions from the other files in the directory, why is that stopping me from displaying the directory entry? I become root and I still can't even display the directory entry for .android_secure. How can that be?   I tried stat. I tried lsattr. Still: permission denied.  I have read  but it doesn't answer my questions:   If I have the permissions needed to list some directory entries, how am I being forbidden to list a specific entry in that directory? How is it ever possible to deny root the ability to list a directory entry?  (And then change the protections on that entry.)   I can accept that the magic filesystem and/or SELinux makes it possible to have different protections on one file.  I just can't understand root being unable to even see what those different protections are.


One-time pad encryption of ASCII characters

I can't understand a question I came across in a course.     You observe three ciphertexts all resulting from encryption of ASCII   plaintexts containing English letters and spaces only, using the   one-time pad and the same key. The 10th byte of the first ciphertext   is 0xA8, the 10th byte of the second ciphertext is 0xED, and the 10th   byte of the third ciphertext is 0xBD. What is the 10th ASCII character   of the third plaintext?   I XORed 0xA8 and 0xBD and got 00010101 I XORed 0xED and OxBD and got 01010000 so clearly 0xED is a space and 0xBD is a character.  What I don't understand is why it is the letter 'p'.  Thank you in advance.


Trying to install Windows XP; bootmgr is missing

I recently installed Ubuntu 13.04, and I wish to go back to windows XP.  I have all the install files on a USB, but when I go to install it, I get an error that says      bootmgr is missing, press ctrl alt delete to restart    Any help?


How to add and later remove or disable a CSS rule in JavaScript?

Is there a way to add and remove or disable a CSS rule in JavaScript? Here is the CSS:   #myElement *, #myElement *:before {    outline:1px dotted red; }   Here is what I have so far:    var myCSS = "#myElement *, #myElement *:before {outline:1px dotted red;}"; // document.addCSS(myCSS);   EDIT: I can't add the rules to the HTML page and toggle between them. I need to be able to create a rule in JavaScript after the page loads and also switch it on and off in JS.


Can I allow a standard user to execute only certain sets of command in terminal?

Can I create a whitelist of commands that a standard user can execute in the terminal in Ubuntu 12.04 desktop?  I don't want to block the terminal for the standard user.


DC Motor as a Generator Voltage and Current

Is there any way to calculate the expected voltage and current, assuming I am turning it at the specified RPM value, when using a DC motor as a generator without physically testing it?  In my case I wanted to use a DC motor with the following parameters:  DC 6V 6300 RPM Torque: 0.1Kg.cm


Does the order of $f(x)$ divide the order of $x$ if $f$ is a group homomorphism?

Suppose $f : G_1 \to G_2$ is a group homomorphism and let $x\in G$ be of finite order. Does the order of $f(x)$ divide the order of $x$?


What is the correct way to install proprietary ATI Catalyst Video Drivers (fglrx) directly from AMD?

I am planning on doing a fresh install of Ubuntu and want to know what is the correct way to install ATI Catalyst Video Driver?      There are multiple valid answers for this question spanning over several versions of Ubuntu. For your convenience an index of each below:


This code snippet:  Math.pow(10,20)+20000 == Math.pow(10,20) + 10000   evaluates to true. Is this a JS bug?


how to redirect pages to newdomain pages?

hi guys I have a domain named old.com and it has some pages , how can I redirect all those pages to their new address using htaccess? currently only old.com redirects to new.com but old.com/posts/ won't redirect to new.com/posts/ . Can anybody give me a htaccess code that passes the pagerank to new.com and redirects all pages to their new address ?


Missing detail on the object when baking normals

I have been having some trouble with normal baking . I am trying to make a die. After the bake is finished, I get the edge detail of the high poly mesh on the maps, but the numbers don't show up at all. I used the text object then converted it to a mesh and aligned everything to where it should be.   When I used a boolean modifier to attach the numbers to my high poly die, the numbers showed up in the bake, but there were lots of artifacts. In my most recent attempt, I filled everything in (cut out the bottom faces of the numbers and attached them to the cube) to make it all one object. What can I do to get this map baked out right? Is this sort of thing even possible? Thanks in advance.


What is the symbol on the supply voltage that looks like a shaded-in capacitor?

I am looking at  (dual low-voltage power amplifier). On the fourth page, there is a sample circuit; right at the V+ input there is a symbol that looks like a capacitor. However, it looks like it is shaded in. What is that?


I have a very slow school computer and the school year is wrapping up soon. I'm using the video editing part of blender, putting in my own music and videotaping for an English project. I rendered it with the default settings (because I don't know how to change them, started yesterday) and there's no sound. I went to go see what was wrong and opened my project back up, but the ability to edit the video or audio was completely blank. I just want my complete video rendered in .MP4 so my teacher can see it;; I'd like to save it so he can hear the audio as well, but when  I render it it saves as a .png and doesn't have sound.


Linear Transformation from $\mathbb R^n$ to $\mathbb R^m$: image of $1$ dimensional subspace has dimension $1$ or $0$

I am struggling to comprehend the question below. Especially the meaning of 'the image of $L$ under $F$'. Let $F : \mathbb R^n \to \mathbb R^m$ be a linear transformation. Prove that if $L$ is a $1$-dimensional subspace of $\mathbb R^n$, then  $$F(L)=\{y \in \mathbb R^m \mid y=F(x),x \in L\}$$  the image of $L$ under $F$ is a subspace of $\mathbb R^m$ with dimension $1$ or $0$. Hence prove that if the kernel of $F$ is $\{0\}$, the image of $L$ is a $1$- dimensional subspace of $\mathbb R^m$ (and so in this case, $F$ takes lines in $\mathbb R^n$ to lines in $\mathbb R^m$).


Updating file locations in QGIS projects?

I have about 30 different QGIS Project files for 30 different clients. Each is saved onto my computer and all their relevant vector and raster files are all saved locally.  We are now in the process of moving office and upgrading our computers.    As a result, I need to move all my files from my computer onto the network drive, thus destroying any previous file references.  Aside from manually clicking on each file and looking for each ones new location, is there any other way around this.  (Each project could have a few hundred links to update)


What kind of lubrication should I use for a lock?

I recently made the Yale lock on my front door much easier to open by spraying some WD-40 in there.  However, I just saw  on WD-40 not being a “true” lubricant, and wondered whether it was appropriate to use on Yale locks?


Throughout my playthrough of Fallout 4, I've never once felt the need to use VATS. I never even considered using it since my understanding of it is that it's just letting the game do the shooting or hitting for you and you're leaving it up to RNG to win a battle.   The only reason I see to use V.A.T.S. is for the critical hits (assuming that criticals only occur through VATS outside of sneak attacks) and for determining if a distant NPC is friend or foe.  What are (if any) the other reasons to use V.A.T.S.?


How does $\mathcal E(\rho)=\mathrm{Tr}_{env}[U(\rho\otimes\rho_{env})U^\dagger]$ turn into $P_0\rho P_0+P_1\rho P_1$?

In the Quantum Operations section in Nielsen and Chuang, (page 358 in the 2002 edition), they have the following equation: $$\mathcal E(\rho) = \mathrm{Tr}_{env} [U(\rho \otimes \rho_{env})U^\dagger]$$ They show an example with $\rho_{env} = |0\rangle \langle0|$ and $U = \mathrm{CNOT}$, and claim that the final solution is: $$P_0\rho P_0 + P_1\rho P_1,$$ where $P_0=|0\rangle \langle0|$ and $P_1=|1\rangle \langle 1|$. These are my steps so far to get this, but I don't know how to trace out the environment after this: Let $\rho$ be $|\psi \rangle \langle \psi |$, so that $\rho \otimes \rho_{env} = |\psi, 0\rangle \langle \psi, 0|$. Applying the unitary $U$, we have $$ |00 \rangle \langle 00| \psi, 0 \rangle \langle \psi, 0 | 00 \rangle \langle 00 |  + |00 \rangle \langle 00| \psi 0 \rangle \langle \psi 0 | 10 \rangle \langle 11 | \\  + |11 \rangle \langle 10| \psi 0 \rangle \langle \psi 0 | 00 \rangle \langle 00 |  +  |11 \rangle \langle 10| \psi 0 \rangle \langle \psi 0 | 10 \rangle \langle 11 |. $$ I don't know how to trace out the environment in the above state. Also, I realize that I have considered only a pure state, if anyone can show it for a general state that would be great.


Wifi not working with broadcom bcm43142 on hp envy, ubuntu 16.4

My problem is that I can't connect to the internet on my HP envy laptop, with Ubuntu 16.04 installed on it in dualboot with windows 10. UEFI secure boot is disabled. bcmwl-kernel-source is already installed.The same for broadcom-sta-*. I am an inexperienced user of Ubuntu. But, I can tell that Wifi worked for a while and then,  it doesn't anymore. I have looked for a solution on the internet but I couldn't find (or understand ?) how to solve my problem. I have no internet connection from this computer. The result of $ lspci -nn | grep -i net gives : 01:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev01)  The result of: $ rfkill list 0: hci0: Bluetooth Soft blocked: yes Hard blocked: no  Then, $ ifconfig -a lo Link encap:Boucle locale inet adr:127.0.0.1 Masque:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 Packets reçus:26316 erreurs:0 overruns:0 fram:0 TX packets:26316 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:1000 Octets reçus:1954296 (1.9 MB) Octets transmis:1954296 (1.9 MB)  EDIT : $ lspci -knn | grep Net -A3 01:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev01) Subsystem: Hewlett-Packard Company BCM43142 802.11b/g/n [103c:804a] 02:00.0 Unassigned class[ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader [10ec:522a] (rev01) Subsystem: Hewlett-Packard Company RTS22A PCI Express Card Reader [103c:80df]  EDIT : $ uname -r 4.15.0-29-generic  Tell me if you need more info about this. Thanks in advance for your answers. Remi


Remove link to elections.se from all network sites which conducted an election

As can be seen in , the site  is closed until further notice (which can take long weeks/months) hence all the links pointing to it are dead.  I would like to suggest removing the dead links from the election results page in Stack Exchange sites, e.g. on :        The link More Information about the candidates points to the URL  which returns a 404.


Does Intel Pentium Quad Core N5000 processor, 1.10 GHz suitable for UBUNTU 18.04.3 LTS installation and reasonable performance?

I am using HP15 074tu laptop. Processor is Core i3 4005U 1.70 GHz *4. I am using UBUNTU 18.04.3 LTS and it is working fine.  I want to know if any other laptop with intel Pentium 1.10 GHz processor support UBUNTU 18.04.3 LTS  in same way as my present laptop.


Looking for a book where the planet is a device to rebuild the universe

I'm looking for a scifi book with an old guy and a group of youngsters that find an anomaly on a planet that looks like a massive pit but ends up being a gate to another world created by this race of aliens that are top shaped with tentacles coming from their mouths.  The old man turns out to be one of them but had forgotten everything until it started to come back when he came to that world. also the world has a seemingly infinite number of land types that cycle randomly, and when a person goes through this gate they get send to a specific land type and their body is changed in order to fit that space.  I think the plot revealed that the planet was a control device used to rebuild the universe. if anyone could help me that would be awesome.


I came across a physics experiment video showing three balls released from a point A, going down three different kinds of ramps leading to a point B ()  Assuming no friction and a point mass for simplicity, is there an ideal curve to get it from point A to B in the shortest time (e.g. is it parabolic)?  Assuming this significant simplification, can it be proven that for any curve between A and B, the point mass should pass B at the same velocity?  I.e. a different curve will only affect the time it takes to get to B, but not the velocity?


Table where last column has width so the whole table not bigger than line

I want to have table, for instance with 3 columns, where the first two columns will have natural width, so the text doesn't wrap and the last column will wrap if the whole table will be bigger than text width. Is it possible in latex?  --------------------------------------- // line | a | asfafasf | asfasfasff           | | b | saf      | asafasfsafasfasfasfs | | c | safasf   | asasffsaf asfasf     | |   |          | asasfsafaf           |


Do I have to reinstall Windows 8 when upgrading my motherboard, cpu and memory, but not my HDD?

I am upgrading my PC, but I'm sticking to my old HDD and gfx card. I would like to avoid reinstalling Win 8. Is this possible? Or, at least, is it possible to use Windows 8's refresh pc option?  UPDATE  It worked like a charm. Windows acted as if it was the first boot and displayed the "Getting devices ready %  " progress bar. I am not sure if this proves you can do it in every scenario, but my new gear is relatively modern (some gigabyte board with two PCIe 3.0 slots and USB 3.0 support + i5), so I guess we can agree the reinstall is unnecessary in most cases.


Using variable in building a Regular Expression

I have seen several similar questions on SO, but not exactly what I'm looking for.   I want to use a variable in my regEx so that when I call it, I can easily pass in a number.  Here's the hard coded regEx:    'mywonderfullString'.match(/.{1,3}/g)   Here's what I need:  'mywonderfullString'.match(/.{1,variableHERE}/g)   So when I call the regEx, I would do something like   'mywonderfullString'.match(/.{1,3}/g)   I've seen some examples using the replace regEx, but I can't seem to my example working.


Confirm that $\int_{0}^{\infty}t^{-1}\sin t dt=\pi/2$.  The guide book I am using gives the following help:  Consider $\int_{\gamma}z^{-1}e^{iz}dz$, where for $0<s<r<\infty$ the contour of integration is described by $\gamma=[s,r]+\gamma_r+[-r,-s]-\gamma_s$, with $\gamma_r(t)=re^{it}$ and $\gamma_s(t)=se^{it}$ on $[0,\pi]$. Recall Exercise IV$.4.20.$  Exercise IV$.4.20.$ For $r$ with $0<r<\infty$ let $I(r)=\int_{\gamma_r}z^{-1}e^{iz}dz$ with $\gamma_r(t)=re^{it}$ on $[0,\pi]$. Show that $I(r)\rightarrow 0$ as $r\rightarrow \infty$ and also that $I(r)\rightarrow \pi i$ as $r\rightarrow 0$  Using the hint, I know that $\int_{\gamma}z^{-1}e^{iz}dz=0$ for the Cauchy theorem, with which $\int_{[s,r]}z^{-1}e^{iz}dz+\int_{\gamma_r}z^{-1}e^{iz}dz+\int_{[-r,-s]}z^{-1}e^{iz}dz-\int_{\gamma_s}z^{-1}e^{iz}dz=0$, but I do not know what else to do here, could someone help me please? Thank you very much.


Isn't "const" redundant when passing by value?

I was reading my C++ book (Deitel) when I came across a function to calculate the volume of a cube. The code is the following:  double cube (const double side){     return side * side * side; }   The explanation for using the "const" qualifier was this one: "The const qualified should be used to enforce the principle of least privilege, telling the compiler that the function does not modify variable side".  My question: isn't the use of "const" redundant/unnecessary here since the variable is being passed by value, so the function can't modify it anyway?


Modifying your own question because you have a better solution?

Curious as to what the protocol is here for when you want to answer your own question.  Say for example I post a question with code illustrating the question. I later on come up with a solution. Now, even with the "improved" code, it could be better.  Is it taboo to answer your own question?  Or is it better to add the "second version" of the code to the original question? Append, prepend?  Or should I delete the original question, and post a new one with the code I came up with?  Other thoughts?


I got my tourist Italian Schengen visa (multiple entry) but in the last minute I am changing my first port of destination to Germany as we decided to go for a one day music festival in Düsseldorf. Mostly I will be staying 5 to 6days in Germany and go to Italy afterwards. I will be staying in Italy for 13 to 14days.   Is it OK to do this and travel to Germany first instead of Italy with my tourist Italian Schengen visa?


How do we calculate factorials for numbers with decimal places?

I was playing with my calculator when I tried $1.5!$. It came out to be $1.32934038817$.   Now my question is that isn't factorial for natural numbers only? Like $2!$ is $2\times1$, but how do we express $1.5!$ like this?


Kolmogorov-Smirnov for Pareto distribution on sample

I want to use the Kolmogorov-Smirnov test to test if a sample is drawn from a Pareto distribution. Unfortunately, the only way to estimate the distribution's parameters is from the sample.  Does anybody know of the existence of tables with modified critical values or any other way to perform the test in this case?


Eeeek! Something stole the protection! (Why is this protected question unprotected?)

asked me to report this (apparent) bug.  When he tried to protect  question someone (or something) stole the question's protection, which has since been missing:          The question shows no sign of having the protection removed, thus I believe it was abducted. I am sure justice will be done, and this poor question will receive the protection it deserves.     I recommend interrogating the  that was said to have announced this question to the world, I bet it would have some useful information.


dpkg exit with error parsing file `/var/lib/dpkg/status`, what to do?

When I try to install any software, I encounter this error, and therefore I cannot update.  Preconfiguring packages ... dpkg: error: parsing file '/var/lib/dpkg/status' near line 51245 package 'oracle-xe':  mixed non-coinstallable and coinstallable package instances present N: Ignoring file 'gcl' in directory '/etc/apt/sources.list.d/' as it has no filename extension N: Ignoring file 'gcl' in directory '/etc/apt/sources.list.d/' as it has no filename extension E: Sub-process /usr/bin/dpkg returned an error code (2)


make it so laptop doesn't install automatic updates while sleeping

If automatic updates are awaiting install and my Windows 7 computer is sleeping that computer will magically wake up and install these updates. I find this to be quite annoying and am curious if there's a way to disable this behavior.  It also seems like it could be pretty problematic if my computer was running on battery. It's asleep, in my backpack, turns on to install updates and then the battery goes dead because Windows was a little too trigger happy to install automatic updates.  Any ideas?  Thanks!


How to cook fall-off-the-bone beef spare ribs in oven or on stove top?

All,  I would like to cook spare ribs to a fall-off-the-bone consistency.  I don't have access to a grill.  I know how to do that with pork shoulders (dry rubbed, then uncovered in the oven at low heat for 6-8hrs), but spare ribs are a different type of animal.  They are individually smaller pieces (my ribs are sawed in chunks), and they are fairly fatty, with a big bone.  What should I do?  Should I pan-sear them first, do I need some liquid in the dish?  Should I cover them?  Thanks,  JDelage