Succinct and understandable term when "turn up"/"turn down" is ambiguous

In particular, think of the home air conditioner or the power setting on the kitchen refrigerator: the intensity of effort is opposite to the numbering of the related quality. So "Turn up the air conditioner" can be interpreted as a request to set it colder (make the machine work more) or warmer (change the control to a larger number).  What terms would be good to use instead, that are grammatically equivalent so they are drop-in replacements and don't require re-arranging the sentence, are succinct, and are understandable (even if  not immediatly familiar) by folks lacking a Chirchhillesque vocabulary? And, the whole point is that they are completely unambiguous.  Ideally the pair of terms should match nicely, but that's not necessary.  I know the confusion can be avoided by phrasing it differently, and that's what I actualy do if I notice it. But I've wondered if there's a better term that could be used in this place that is simply not ambiguous at all.


Ubuntu SSH connection hangs when I run ifconfig with IPv6 enabled

I've been playing around with IPv6 and setup a DigitalOcean droplet. The only difference between now and before is that I told it to setup IPv6. More often than not, when I run ifconfig the SSH session hangs, then disconnects due to unresponsiveness. The ifconfig command doesn't finish when this happens...it only gets past dumping the IPv6 details.  Any place I can check to debug this? My solution right now is just not to run ifconfig.  After reading the comments again, I realized that there is maybe a misinterpretation occurring. My command was only ifconfig to display network details, I'm not configuring anything with it so there are no extra details beyond that.  The tip that ifconfig isn't in use anymore is the most helpful thing so far. There is so much legacy crap on the net still, it is easy to pick up something antiquated.


Find $\sum\limits_{r=0}^n(-1)^r\binom{n}{r}^{-1}$ for $n$ even

If $n$ is an even natural number, then find    $$\sum_{r=0}^n \left(\frac{(-1)^r}{\binom{n}{r}}\right)$$    I tried to solve the question using conventional method, by trying to use calculus, but I don't think that would be applicable here, because no binomial expansion (as far I as know) can give a coefficient in denominator hence I got stuck at it.


If $E\subset \mathbb{R}$, $f:E\to\mathbb{R}^m$, and $||f(x)||=1$ for all $x\in E$, then $f'(x)\cdot f(x)=0$ for all $x$

I'm given the hint that $||f(x)||=1$ can be written as $||f(x)||^2=1$, and that the chain rule may be helpful, but I'm still not sure how to proceed. Can someone point me in the right direction?


To which countries in Europe can I travel without a visa with a blue card from Bulgaria

I have a Bulgarian Blue Card, and I know that it is not valid for countries in the Schengen area. But, I can go, for example, to Romania (I was there last week) with the blue card.  There are others countries like Romania in Europe where I can go with my Blue Card for vacation?


Question on basic tensorial calculus on field theory

Working on the Maxwell field as a gauge theory, at some point the following derivative comes up:  $\frac{\partial(\partial_iA_0)}{\partial A_0}=0$  which must be, accordingly to the theory, zero.   My doubt is: why is that necessarily true? Is this a specific feature of the form of the fields in this case? Or, maybe, is always true because of some assumption that the field and its derivatives are independent variables?   I'm confused about this because mathematically this is trivially not true and the most obvious "one-dimensional" example is:  $f=e^x$  $\frac{\partial}{\partial f}\frac{\partial f}{\partial x}=1$


Trying to make a simple typography animation but when I go to the render tab, nothing shows up


I am trying to unzip a Facebook download-your-info zip file, but here's what I got:   Is there a way I can force-unzip it?  I tried sudo unzip file.zip -d destination_folder in terminal (I use Linux), and it unzipped the file, but what came out, all the files have size 0 bytes:   I do have permission to the directory and the file.   (I'm really sorry if my question is asked badly. Let me know down in the comments :) )


Why is a www to no-www redirect so slow?

I'm quite new to running a website, and I've recently run my page through some page load time measurements to try and reduce load time. After scaling down my images etc, I find that the bottleneck comes from 'wait' time, notably time spent waiting for a redirect from my www domain to the domain without www.   Is there a way to prevent the additional load time caused by the redirect, while still having my page be accessible with or without the www in the URL?  I am running on a Wordpress installation on DreamHost.     is about why the wait times are slow when loading page, but it does not address redirects.


How do I bring up that initial guided tour panel again?  I'm mooking for the panel that starts with "connect your online accounts and then moves on to suggesting different types of linux software.  I really liked some of the suggested apps but since I'm new to linux, I don't remember any of their names.


How to check if a DateTime field is not null or empty?

I am very new in C# and I have a doubt.  In an application on which I am working I found something like it in the code:  if (!String.IsNullOrEmpty(u.nome))   This code simply check if the nome field of the u object is not an empty\null string.  Ok this is very clear for me, but what can I do to check it if a field is not a string but is DateTime object?


what is the difference between != and !== conditions in java script?

i am trying to figure out the difference between  != and !== in java script , is both ways are used to check the not equal to conditions? i am confused trying to get the difference . please any one give me solution?  example ----------
      show data
      (or)
      show data


How can I include HTML code in my Gmail signature?


Unsolicited Tabs keep Appearing On Chrome On My Samsung 7 Mobile Phone

New tabs containing questionable sites/malware warnings etc. keep popping up unsolicited on Chrome on my Samsung 7 mobile phone.  Sometimes as many as 10+ in an hour.  Sometimes I can be using a different app and I will automatically be redirected to a new unsolicited web page in Chrome.  I have tried everything including clearing cache etc. and various antivirus/malware scans.  Even cleared nonessential apps from my phone.  Would like to uninstall and reinstall Chrome, but understand that's not possible.  Any ideas?


Consider the integrable functions $f, g: [a,b] \rightarrow > \mathbb{R}$. Prove that if $$\hspace{5cm} g(x) \ge 0 \hspace{3cm}  \forall x \in [a, b]$$      and $$m = \inf(f)$$ $$M = \sup(f)$$      there exists a $c \in [m, M]$ such that:      $$\int_a^b f(t)g(t) dt = c \cdot \int_a^b g(t)dt$$   When I think about it, it doesn't seem so far fetched. If we have two functions on the interval $[a, b]$, then it obviously seems reasonable that there exists a $c_1 \in [m, M]$ such that $$f(x) = c_1$$ , with $x \in [a,b]$. So we would have:  $$f(x)g(x) = c_1 g(x)$$  We could find a $c_k$ for every point $x \in [a, b]$, so that means that we can integrate the above relation and get:  $$\int_a^b f(t) g(t)dt = c \cdot \int_a^b g(t)dt$$  where $c$ is a some sort of linear combination (I think, I'm not sure) of all of the $c_k$'s that I used for every point in the interval $[a, b]$.  What's a better, more concise proof to this identity than the weird and incomplete one that I came up with?


Is there any music player that can hide its main window and only show the playlist?

I use JetAudio basic on Windows and I'd love to have the same modularity that it has on Ubuntu. Specifically, the ability to customize displays and the ability to separate playlist from the main window. I've tried a few but they all looked like iTunes clones, which is really cluttered and has too much information on screen.  It'd also be great if it could play FLAC files but that's not a necessity.  This is the look I'm looking for (just the playlist and nothing else that will clutter the screen when I restore it from minimized status):


Select on change event disappear after tr modification

I have list of rows and one cell with select. One row is hidden. I use it as a form to add new row. On document ready I select all select fields and add on change event for all of them: const supplierFields = $('select[name$="supplier"]'); supplierFields.on('change', async (select) => {         //custom logic here..     });  When I use hidden row to add new row I select it and add data: const emptyForm = EstimatesTable.visualization.formSet.find( '.empty-form').prev('tr');  When new row is added event on select field disappears, but other events on inputs for example stays. Where could be an issue? When I inspect elements on browser hidden row and other old rows has events. After refresh event appears because of on document ready function.


Better application switcher for Budgie desktop

I'm using Budgie Desktop currently, and I really enjoy it. It's got good battery life, customizability, stability and speed, but there's just one thing that bothers me; it doesn't have a real app switcher. Pressing Alt + Tab will switch apps, but no dialog appears, and it doesn't allow me to select an app I want to see; it just calls them all to front, on at a time.  Because of this, I've been looking for some third party app switcher that'll show a dialog and let me select the app to switch to instead of just pulling everything to the front. Right now, I'm using skippy-xd, which is an exposé-style switcher. It's OK, but I'd prefer the linear method that Unity and GNOME use.  Googling has turned up nothing. I think I'm just not doing it correctly.  Are there any standalone app/task switchers (besides skippy-xd) available for Ubuntu or Linux in general?


Gparted : How can I merge unallocated space to my Ubuntu?

It was my initial status, so I wanted to reduce Windows 10 storage (dev/sda3) and merge that unallocated space to my Ubuntu  There are unallocated space left to Ubuntu space.  But when I try to expand Ubuntu storage to left side, it fails.  How can I solve this?


I need help with installing Ubuntu 14.04 alongside to Windows 8

I bought a new Lenovo B350 with Windows 8 pre-installed.  Should I continue with the windows setup and then just download 14.04 from the Ubuntu website?  I tried just booting a 14.04 DVD and it did not install.  The computer remained on the acceptance of Windows window.


Static as opposed to Kinetic Friction in Rolling Motion

During analysis of , why do we consider coefficient of friction as that of static friction and not kinetic friction?


Button or menu entry to clear the sculpting mask?

A mask has been created:    The shortcut Alt+M will clear it. Is there a button in the user interface? Or a menu entry?


How does integrating just over the PDF of a random variable give you the expected value of that random variable?

My text contains the following exercise:     Let $X$ be a continuous random variable with CDF $F_X$. Suppose that   $\mathbb{P}(X > 0) = 1$ and that $\mathbb{E}(X)$ exists. Show that:      $$\mathbb{E}(X) = \int_0^{\infty} \mathbb{P}(X > x) dx$$   I have already completed the proof, which centers on recognizing:  $$\int_0^{\infty} \mathbb{P}(X > x) = \int_0^{\infty} (1 - F_X(x))dx$$  And then applying integration by parts. But the proof didn't provide any intuition for why the proof statement is true. In particular it is surprising to me that we can integrate over probabilities (technically over probability densities) without including any value of the random variable at all and end up with a value that is in the same units/space as the random variable. $0 < F_X(x) < 1$ but values of $X$ are only required to be non-negative so they could be arbitrarily large. Why does this work?


Problem with GNU GRUB popping during start of OS system

I tried to delete Ubuntu and deleted a disk partition from Windows 10. Now I'm stuck at the GNU Command Line and I don't know how to exit this because I'm not familiar with Linux and Ubuntu. How can I get back to Windows 10. And can I actually delete GRUB from command line? Thanks


In a Transformer model, why does one sum positional encoding to the embedding rather than concatenate it?

While reviewing the Transformer architecture, I realized something I didn't expect, which is that :   the positional encoding is summed to the word embeddings  rather than concatenated to it.               Based on the graphs I have seen wrt what the encoding looks like, that means that :   the first few bits of the embedding are completely unusable by the network because the position encoding will distort them a lot,  while there is also a large amount of positions in the embedding that are only slightly affected by the positional encoding (when you move further towards the end).               So, why not instead have smaller word embeddings (reduce memory usage) and a smaller positional encoding retaining only the most important bits of the encoding, and instead of summing the positional encoding of words keep it concatenated to word embeddings?


I am running Windows 8.1 x64 with all the latest updates from Microsoft. But still when I click on the GWX icon on the system tray it says "We are still evaluating your PC for the update".  People have already received the Windows 10 upgrade. Can anyone tell me why this is taking so long for me? Any suggestions would be helpful.


How to validate US phone numbers, US state code and US zip code in PHP?

I want to validate US phone number, US state code and US zip code using PHP for it I wrote following functions but they are not working properly.  /** check phone number validation**/   function phone_no($str) {      return (bool)eregi( "^([-\(\)\+, 0-9])+$", $str );   } /** check zip code validation**/ function integer($str) {     return (bool) preg_match('/^[\-+]?[0-9]+$/', $str);   } /** check state code validation **/      function alpha_num_symbol($str) {         return ( ! preg_match("/^([a-z0-9\+_\.*-\/'& ])+$/i", $str)) ? FALSE : TRUE;     }   I'm passing the value from input field of form using variable $str. Can someone please help me in correcting my code so that I can properly validate US phone number, US zip code and US state code. If anyone have any idea to make this thing workable please help me. Thanks in advance.


How to put the numbers of the pages at the top of each page?

Could you please help me find how I could put the numbers of the pages on the top of each page as is used in classicthesis? This is my mwe :  \documentclass[fontsize=12pt,%                twoside=semi,%                headings=small,%                chapterprefix=true,%                listof=flat]% {scrbook} \addtokomafont{pageheadfoot}{\scshape\small}%changed to small caps in headers \usepackage{lipsum} \begin{document} \chapter{A chapter} \lipsum  \chapter{Another chapter} \lipsum  \end{document}


I have a .bst file which I would like to use to customise my bibliography - I am passing the backend=biber in my preamble and I can currently only choose from the in-built styles. Where should I save this .bst file and how can I load it into my package so I can use it? I am using TeXshop on Mac.


What oil is best for seasoning a cast-iron skillet

I just cleaned up a rusty cast-iron skillet and I would like to season it. The thing is that I don't have lard handy and I'm wondering whether any of my other oils and fats would do.   I have: canola, olive, sesame and almond oil.   Also, I've heard that appying the oil and reheating multiple times improves the seasoning. Is it true? How many times does it make sense to repeat the process?


Ubuntu 16.04 slow boot (apt-daily.service)

My boot is horribly slow, and I don't know why.  $ systemd-analyze  Startup finished in 10.975s (kernel) + 49.732s (userspace) = 1min 708ms $ systemd-analyze blame           34.971s apt-daily.service          20.590s snapd.refresh.service          17.113s grub-common.service          16.033s apport.service          16.027s networking.service          15.894s ondemand.service          15.860s irqbalance.service          15.655s speech-dispatcher.service          11.695s ModemManager.service           9.772s accounts-daemon.service           8.626s NetworkManager-wait-online.service           8.058s systemd-logind.service           8.053s bluetooth.service           7.944s gpu-manager.service           7.896s alsa-restore.service           7.892s pppd-dns.service           7.882s rsyslog.service           7.860s avahi-daemon.service           7.844s dev-sda1.device           7.842s systemd-user-sessions.service           7.648s lightdm.service           7.610s teamviewerd.service           6.445s apparmor.service   Also, during boot-up, I see a message that says something like:  device descriptor read/all, error -62 ata1 softreset failed (device not ready) #most of the times error loading journal #(sometimes) Test WP failed, assume Write Enabled Asking for cache data failed     #most of the times Assuming drive cache: write through   apt-daily.service slows the boot the most. Any idea on how to tackle that?  I have Ubuntu MATE 16.04.


Lets say I have a factor called cognitive load that has 3 levels (low, medium, high) and I want to determine how load levels can affect reaction time on some task  There are at least 2 ways that I could conduct this test.  The first would be a one way ANOVA with a single 3 level factor. After running this test I find that the main effect of this factor is not significant. I was always taught that without a significant main effect you shouldn't/dont need to test the differences between each of the groups/levels  The second way is to dummy code the factor and treat it as a regression, predicting reaction time from the 2 generated dummy variables. If I treat low load as my reference group, then my dummy variables would capture the difference between low/medium and low/high. When I conduct this analysis I find that one of my coefficients is significant (e.g. high is significantly different from low load)  So this situation leads to 2 different interpretations of the results. On the one hand I dont have a significant effect of the factor overall, but upon looking at group differences with regression I find something interesting  Which technique should actually be followed? Should I be looking at group differences in ANOVA despite the lack of a significant main effect?


Is there a faster way to connect edges (f key) around a closed loop of eges quickly?

I'm trying to fill in the edges along the circle across its two sides, but with so many of them it's going to take very long selecting them individually, is there a faster way to do this?


If $F$ has characteristic $\neq$2 and $E/F$ is a field extension with $[E:F]=2$, then $E/F$ is Galois.  Normal and separable extension is Galois extension. Can we say that since the degree of extension is $2$ it is normal. But how to prove that it is separable?


I would like to start learning about symmetries in physics and how they affect physical quantities. As far as I know, the mathematical language that describes symmetries is the Group Theory. So, I think the best start would be getting deep in this theory. Although there are many books on that topic, I would like to find one that would be written in a very simple way, for beginners, with many examples, preferably in the physical context. Could anyone suggest such a book?  Note: I would like to study graphene and other 2D materials such as transition metal dichalcogenides.


Why is my table rendering in a nonsensical place?

I'm using TexWorks and am trying to use the following table:  \begin{table}[] \centering \begin{tabular}{ll} \( a+b=b+a \) & \( a \cdot b = b \cdot a \)   \\ a & a  \\ a & a  \end{tabular} \end{table}    The table renders in the beginning of the text for unknown reasons. See:        Perhaps it's a consequence of the header of my code? It is as follows:  \documentclass[11pt,twoside,a4paper]{article} \usepackage[a4paper, portrait, margin=0.5in]{geometry}  \usepackage[utf8]{inputenc} \usepackage{cancel} \usepackage{amsmath} \usepackage{amsfonts}   I didn't forget the \begin{document} and \end{document}. I just ommited it.


I am trying to modify the following code:  dictName = sharedPreferences.getString(PREFERENCES_DICT_NAME, null); if (dictName == null) { }    My situation is I know dictName is not null and its value is "something". So I modified the code into:  dictName = sharedPreferences.getString(PREFERENCES_DICT_NAME, null); if (dictName == "something") { }    However, I can't get my code work. So I am wondering is it correct for me to put dictName =="something"?


I have a project requirement to use open protocol RFID tags to control doors handling of a light rail train (also called a tram in Europe). The application must sync and control 2 different doors: one at the train (normal train door opened by driver´s control) and other at the station, also called the platform door. Something as seen in    The idea is, once the train stops at the correct position, when the train drivers commands the train doors to open, the platform door opens in sync. Once tha train driver commands the door to close, the platform door closes also in sync.  To do it, I´m looking for a Gen2 RFID Tag that is externally controlled by a switch or a power connection.  The idea behind the application is:  An RFID once in front of its pair antenna sends its data (code).  To sync doors, it need to "TURN ON" and "TURN OFF" the RFID reading by an external command to the tag. As the control is in the train, where the tag is located, then I need to control the TAG code transmission.  If I use a normal RFID in this application once the train approaches is position the RFID code is sent, the antenna captures it and command the platform doors to be open.   What I need is to sync the moment when the RFID code is sent with  the train door command, so that when the train stops no code is sent (the tag is "off") and when the door is commanded to open it "turns on" the RFID that sends its code that will be interpreted and command the platform door to get opened.  RFID usage is a requirement, not an option.   Advices welcomed.


How to programmatically minimize an iPad application?

How do I programmatically minimize an iPad/iPhone UIApplication?


Proving Existence of Multiplicative Inverse

I am given 2 sets.  Set $R = \{a+b\sqrt2: a,b \in \Bbb{Z}\}$ and Set $U = \{\alpha \in R: N(\alpha) = 1\}$ where $N(\alpha) = a^2 - 2b^2$  I am supposed to show that $U$ is a subgroup of $\Bbb{R}^x$ which means the set of units over all real numbers.  I was able to show that $1 \in U$ and set $U$ is closed under multiplication, but I still have to show that every element of $U$ has a multiplicative inverse, and I have no clue how to do so.   If you could let me know, I would greatly appreciate it. Thanks!


How to increase spacing after a question title in exam?

In the following example, I would like to add a \vskip 1em after each question. The body is too close to the question title. \documentclass{exam}  \qformat{\large\textbf{Question\thequestion~: \thequestiontitle}\quad (\thepoints)\hfill}  \begin{document} \begin{questions} \question[42] Lorem Ipsum. \end{questions} \end{document}


For which prime numbers $p$ does the congruence $x^2 + x + 1 \equiv 0 \pmod{p}$ have solutions?

For which prime numbers p does the congruence $x^2 + x + 1 \equiv 0 \pmod{p}$ have solutions?  We've recently learnt about quadratic reciprocity in class, however I am not sure how to tackle this problem. I have tried starting with the $b^2-4ac$ (discriminant) but that hasn't really helped.


Is there Ubuntu's analogue of snapshot.debian.org?

Debian users have a kind of "wayback machine":  , which is really great.  There are regressions sometimes, and if I don't have local deb package with old version, I'm getting sad sometimes. Having a wayback machine like this is very helpful.  I can't find analogue of it for Ubuntu. Have I missed it?


How to return two values in a C++ function

I am trying to write a function in c++ to calculate the sum and product so my code is like that: #include <iostream> using namespace std;  int Product_Sum(int x, int y, int z) { int sum, product; sum = x + y + z; product = x * y * z;  return sum, product; }  int main() { int result; int x = 5, y = 10, z = 15; result = Product_Sum(x, y, z);  cout << result; enter code here  }  as a result I am just getting the sum of the numbers, how I can return both values together ? I tried writing it with retrurning 0 but I think it's not the right way


Admittedly I don't get it. Say you have a memory with a memory word of length of 1 byte. Why can't you access a 4 byte long variable in a single memory access on an unaligned address(i.e. not divisible by 4), as it's the case with aligned addresses?


My teacher used some trick for proving there is no supremum in $\mathbb{Q}$ for $\{x|0<x^2<2, x \in \mathbb{Q}\}$.  He defines a variable: $\xi=\frac{2c+2}{c+2}$. So, I noticed that $\xi=\sqrt{2}$ if $c=\sqrt{2}$. Where does this $\xi$ comes from?


If ${a_n}$ converges, then ${a_{2n}}$ converges proof question

I am trying to prove that if a sequence $\{a_n\}$ converges, then the sequence $\{a_{2n}\}$ converges as well using the definition of convergence.   What I have so far is if $\{a_n\}$ converges, say to $L$, then for any given $\epsilon >0$, there exists an $n^* \in \mathbb{N}$ such that if $n > n^*$, then $\mid(a_n - L)\mid < \epsilon$. I think I want to choose an $n_1^*$ such that this is true for $\{a_{2n}\}$. I'm just not sure exactly how to choose the $n_1^*$. I thought maybe $\frac{n^*}{2}$, but I am not sure this is right and wouldn't know how to implement it.   Thanks in advance!


JavaScript regex to allow only characters that consist of alphabets, numbers and special characters


Librarian (gold) and Research Assistant 2 (silver) - proposal

Citing  from when "Research Assistant" badge was created     Looking through the data, it seemed to me that excerpts are handled fairly well by the community. I wanted to add a push to wiki editing, not excerpt editing (which is forced anyway). So... the badge counts distinct tag wikis you edit excluding excerpts."   17 months after its creation, the "Research Assistant" badge has certainly helped to improve Stack Overflow's tag wikis (103 badges awarded * 50 tag wiki edits = at least 5150 improvements made).    Yet, many tags there still do not have tag wiki or wiki excerpt. Examples of the latter:  models - 1150 questions, show - 1148 questions, alertdialog, 1070 questions, reload - 997 questions, send - 958 questions.  New examples (28-Nov-14):    - 1162 questions.  - 1047 questions.  - 985 questions.  - 938 questions.   BTW, it's odd that the "learn more" page doesn't show the wiki when it exist, but the excerpt. E.g.: see tags layer and matching. Reported this .   There are some broad tags where it is useful to have excerpt with:     the tag meaning  information about when to use the tag, and when not to use it   Tag wiki excerpts are very helpful to keep SE websites organized and new users well-informed. If SO's situation is still not perfect (comfortable, though) smaller SE sites struggle a lot to get certain resilience, with respect to this matter.  Thesis statement  Although "Research Assistant" creation was a leap of improvement to the completion of SO's tag wikis, many SO tags still don't have tag excerpts/wikis, and much less smaller SE sites (which could greatly benefit from this proposal too).  Proposal  Improve the current incentive for creation/edition of tag wikis and tag excerpts.  Note that this is a rough draft.    Make tag excerpts count for "Research Assistant" (silver) badge.     Research Assistant (silver): 50 edits on tag wiki and/or tag excerpts.    Create a new gold badge for tag wikis     Librarian (gold): 100 tag wikis edited (not valid for tag excerpts).  These (new/modified) badges should be awarded retroactively.   Tag Editor (bronze) can stay as it is.    These suggestions would further incentivize the completion and improvement of tag wiki and tag excerpts beyond what the original "Research Assistant" already does.  I am fine with the +2 reputation gain for tag edits – not suggesting any changes to that.


I'm trying to prove the following limit   $$(\frac{2^n}{n!}) \to 0$$  But it seems difficault to me. How can I prove it?  Thanks.


Collosal difference between FPS in Dark Souls II and Dark Souls III

I don't know if you here at Arquade SE accept technical questions, but I'm willing to try anyway. I am a huge Dark Souls fan, so naturally, I have all three games on my laptop. Before we go into my problem, let me specify my laptop's "kind". I have a HP EliteBook 8760w. This puppy is sporting intel CORE i7 and Nvidia Quadro 3000M with 8 GB of RAM. I know that this is not a gaming laptop (it is a workstation, hence the Quadro dedicated graphics), so I naturally won't be able to get straight 60 FPS on 2016/2017 games like Dark Souls III for example. But recently, something strange occurred. I just started playing Dark Souls II three weeks ago. I immediately noticed FANTASTIC performance. My frames never dropped below 30 FPS, and the average was around 45 to 50 FPS. At first I though this was due to my "Best Performance" option enabled, but then I reconfigured the settings to HIGHEST POSSIBLE: all best quality textures, Anti-Aliasing, depth of field etc. The performance stayed exactly the same. But when I play Dark Souls III (on lowest possible settings of course with "Best Performance" mode enabled), my performance is abominable. The average FPS is about 12 to 16, and the cap is 20. My main question is: Why on Earth does this happen? I'm dying to know the answer, as I am looking for ways to boost up my laptop performance to at least 30 FPS. I have three hypotheses:  (Very unlikely) The low FPS is due to the "age gap" between games. While Dark Souls II was originates in 2014, Dark Souls III is a 2016 game. But as I said, I don't think that 2 years could impact performance so heavily.  (Straight up impossible) Dark Souls II uses OpenGL or OpenCL for compilation (this would explain great performance, as Quadro architecture is specifically aimed at OpenGL and OpenCL), while Dar Souls III uses DirectX. I don't think that is possible though, as I had to install DirectX 2010 in order for Dark Souls II to work.  The older version of DirectX is (somehow) more compatible with Quadro architecture than the one that runs with Dark Souls III.   I hope my question won't get immediately purged as off-topic just because it contaigns a technical issue. All remarks, criticisms and answers are welcome! Thank you in advance. EDIT: One thing you might want to consider: a lot of people are telling me that Dark Souls II performs so well because it was made for previous gen consoles. Well, that was my initial thought as well, but then I compared it to the original Dark Souls: Prepare to Die Edition. Even this ancient (brilliant) game from 2011 has worse framerate than its 3-years-younger successor (I DO have DSFix installed to be fair) - Dark Souls II. I have a strong feeling that there is something special in Dark Souls II that makes my Quadro tick. Any ideas what this could be?


In solid mode my character has all their details and colors on, but when I switch to render, the character goes completely black regardless of the light. How do I fix this?


Pauli exclusion principle: why does it imply that $Z\approx N$ in stable nuclides with $A<40$?

I have read that when representing the possible nuclides in the $(Z,N)$ plot, the stable nuclei located on the line $N=Z$ for $A<40$, and that this is due to the Pauli exclusion principle. I have read about it in  question, but this is still not entirely clear to me: why does the Pauli exclusion principle imply that nuclides with an unequal proportion of protons and neutrons are unstable?


Instruct Ubuntu to boot to RAM from flash drive using unetbootin

I have used  to create an installable / live bootable flash drive from Ubuntu 12.04. However that didn't preserve the normal Ubuntu boot menu which allows to me to enter advanced options. It has a custom menu that I can pick from predefined choices like "Install Ubuntu" and "Try Ubuntu without installing". What I would like is to be able to boot from the USB flash drive, but then be able to remove it from the computer once the desktop has loaded. The laptop I would like to use this on does not have an optical (CD/DVD) drive - nor do I have a USB version available.  What do I need to modify on the flash drive to add an option to "Try Ubuntu (RAM)" that passes the TORAM=yes parameter to the initrd options? Are their other things I need to touch/change as well? Is it even possible? I am not restricted to version 12.04 if that makes a difference.  Bonus: I would guess the answer would also allow for other options like acpi=off as well, but if it is different I would appreciate having that answer too.


Coordinate-free proof of $\operatorname{Tr}(AB)=\operatorname{Tr}(BA)$?

I am searching for a short coordinate-free  proof of $\operatorname{Tr}(AB)=\operatorname{Tr}(BA)$ for linear operators  $A$, $B$ between finite dimensional vector spaces of the same dimension.    The usual proof is to represent the operators as matrices and then use matrix multiplication. I want a coordinate-free proof. That is, one that does not  make reference to an explicit matrix representation of the operator. I define trace as the sum of the eigenvalues of an operator.  Ideally, the proof the should be shorter and require fewer preliminary lemmas than the one given in .  I would be especially interested in a proof that generalizes to the trace class of operators on a Hilbert space.


Exercise on local and global symmetry for a given Lagrangian density

The following Lagrangian density describes a charged scalar field. Determine the global U(1) symmetry. Make this global symmetry local and give the Lagrangian density. The Lagrangian density is given by: $$L = \partial_\mu \psi \partial^\mu \psi^* - \frac{1}{2}m^2|\psi|^2 - \frac{1}{4}\lambda|\psi|^2.$$  My first idea was to perform the following transformation (because it is mentioned we are dealing with U(1) invariance): $$\psi \rightarrow e^{i\theta}\psi$$ $$\psi^* \rightarrow e^{-i\theta}\psi^*$$ $$\partial_\mu \psi \rightarrow D_\mu \psi = (\partial_\mu + iqA_\mu)\psi$$ and $$\partial_\mu \psi^* \rightarrow D_\mu \psi^* = (\partial_\mu - iqA_\mu)\psi^*$$ However I think this is what you have to do to obtain a local symmetry out of the global one. I have no idea how to find the global one. In short my questions are:  How do you find the global U(1) symmetry for a given Lagrangian density? Is the way to determine the local symmetry out of the global U(1) symmetry achieved by transforming in the following way: $\psi \rightarrow e^{i\theta}\psi$, $\psi^* \rightarrow e^{-i\theta}\psi^*$, $\partial_\mu \psi \rightarrow D_\mu \psi = (\partial_\mu + iqA_\mu)\psi$ and $\partial_\mu \psi^* \rightarrow D_\mu \psi^* = (\partial_\mu - iqA_\mu)\psi^*$?  Thanks in advance!


subgroup of direct product of two groups

Its seems true but I did not see in any group theory book. Let $G\times_{c} H$ be product of two abelian groups (both are infinite). Then $I$ is subgroup of product iff $I = A\times_{c} B$ where $A$ is a subgroup of $G$ and $B$ is a subgroup of $H$. Thanks


What happens if you answered your own bountied question, and the bounty expires?

What happens if I answered my own bounty, and no one else's answer fit my question?  When the bounty expires, I can't award it to anyone. What will happen?


Gmail treats mails from my domain as spam. Why? How to avoid it?

Whenever I send a mail from myaccount@example.com to a Gmail account, Gmail treats it as spam.  I'm talking about the one e-mail I send to a prospect after I've met him (it is surely non-spam mail). It's happened several times already:  "Hey!, you never sent that e-mail you promised me" the prospect says.  "How come...? I did send it. Check the spam e-mail" I answer.  "Oh,  there it is..."  I think it has to do with example.com not being a well-known domain.  How/Where should I complaint about this?


Is there any justification for degree of freedom of diatomic molecules to be two? I believe that degree of freedom are the number of coordinates needed to specify the position of a molecule so how this value is same for diatomic as well as tri atomic linear gas molecules


Solution of two quadratic equation with a particular structure

I have a system of two quadratic equations with unknowns $x$ and $y$ and the following structure \begin{cases} 0=ax^2-bxy+kx-r_1y+c_1\\ 0=by^2-axy-kx-r_2y+c_2 \end{cases}  where all parameters are nonzero positive scalars, except $a$ and $c_2$ that could also be negative. Is there a special algebraic solution for the above system? Is there any possibility to get a unique solution?


Is there a free or open source library to read Excel files (.xls) directly from a C# program?   It does not need to be too fancy, just to select a worksheet and read the data as strings. So far, I've been using Export to Unicode text function of Excel, and parsing the resulting (tab-delimited) file, but I'd like to eliminate the manual step.


This is the question that i got.  Enter 2 integer (x and y) and print random integer between x and y.  I want to know why my code does not print the random integer. I am still a beginner in java, any help would be nice. Thank you.  import java.util.*; class Random_integer {     public static void main(String[] args) {         Random randomNum = new Random();         Scanner input = new Scanner(System.in);         int integer1, integer2;         System.out.print("Enter two integer : \n ");         System.out.print("\n Integer 1 : ");         integer1 = input.nextInt();         System.out.print("\n Integer 2 :");         integer2 = input.nextInt();         randomNum = new Random(integer1, integer2);         System.out.print("\n Random number : " +randomNum);     } }


TextEdit turned HTML file into RTF while open - how to undo?

I was on a Mac with no plaintext text editor installed, and needed to make a very quick change to a HTML file saved on a shared drive. I opened it in TextEdit, set it to "Plain text" in Preferences (which had no effect), hit Format > Make Plain Text, hit undo since that didn't help, then I closed TextEdit without saving.   It gave some warning about not being able to store previous versions of the file because the shared drive doesn't support that, and wouldn't quit until I chose "okay". I thought this would be fine since I hadn't saved any changes.  Somewhere along the line, TextEdit had quietly deleted the original HTML file and created an RTF version. This unwanted RTF's creation date was from around the time I opened it.  There's nothing in trash, and I've tried "Revert to" in TextEdit (no previous versions).  Is there anything I can do to get the original file back?   Operating system is 10.9.5 if that's relevant.


Counting sequences $(c_1,\ldots,c_n)$ of integers $c_i\geq -1$ such that $\sum_{i=1}^n c_i=0$, and for all $1\leq i \leq n$, $\sum_{j=1}^i c_j\geq 0$.

An $\mathbf{R}$-sequence is a sequence $(c_1,\ldots,c_n)$ of integers $c_i\geq -1$ such that $c_1+\cdots +c_n=0$ and for all $1\leq i \leq n$, $c_1+\ldots+c_i\geq 0$. For each $n\in \mathbb{N}$, determine the number of $\mathbf{R}$-sequences of length $n$.  An approach I have been considering is to compute the number of $\mathbf{R}$-sequences by constructing a surjective function $f:\mathcal{M}\rightarrow\mathbf{R}$, where $\mathcal{M}$ is the set of Motzkin paths (2D lattice paths that start at $(0,0)$ with NE,E,SE steps, ending at $(n,0)$ and never going below the $x$-axis) and determining the size of the pre-image $|f^{-1}(R)|$ for each $R\in \mathbf{R}$. Indeed, given a Motzkin path $\mathcal{P}$, for each strictly rising NE-subsequence $r_1,\ldots,r_\ell$ of $\mathcal{P}$ there are $comp(\ell)=2^{\ell-1}$ ways to construct that corresponding segment of the corresponding $\mathbf{R}$-sequence. So if $\mathcal{P}$ has $k$ rising NE-subsequences each with length $\ell_k$, there are $$\frac{2^{\sum_i^k \ell_i}}{2^k},$$ possible $\mathbf{R}$-sequences. So we have reduced the problem to determining the number and length of each of such rising subsequences in the set of Motzkin paths. For completeness, the generating function for class of Motzkin paths is given by $$M(x)=\sum_{n=0}^\infty \sum_{k=0}^{\lfloor n/2\rfloor}\binom{n}{2k}\frac{1}{k+1}\binom{2k}{n}x^n,$$ where $$m_{n,k}=\sum_{k=0}^{\lfloor n/2\rfloor}\binom{n}{2k}\frac{1}{k+1}\binom{2k}{n},$$ is the number of Motzkin paths of length $n$ with $k$ NE-upsteps.  Looking for any insights into making this work, or another valid approach to counting these objects.


As the title suggests, Can the effects of a person's mass upon the local gravitational field be detected and measured remotely?  I am aware any mass produces and effects gravity but couldn't find anything in my searching if it is possible or theoretically possible to detect this effect remotely.


Why exist "have got" if exist "have", while both this grammar constructions in most cases means the same thing. If I don't right, in what case we need use "have got" instead "have".


Questions with ended bounties are not being removed from the "featured" tab

According to , questions with bounties are removed from the "featured" tab once the bounty ends:  Questions with an active bounty appear with a special icon in all question lists, and are also visible on the home page's Featured tab. During the grace period, there will be no indication in the questions lists (e.g. front page, featured tab) that the question has a bounty  However, the current behavior, at least in some instances, is that bountied questions are remaining on the featured tab beyond the seven-day bounty period. On Biblical Hermeneutics.SE, a recently bountied question's  shows that the bounty ended two days ago (July 26, 08:47 UTC) and that it started on July 18 at 07:00 UTC:    Given this, the question should have been removed from the featured list on July 25, at the start of the grace period.  As of this moment, however, the question still appears on the featured tab:    The problem is not limited to BH.SE.  On Christianity.SE right now  whose bounty was started more than 7 days ago, and which was already awarded, still appears in the featured tab:     Why are bountied questions not being removed from the featured tab exactly 7 days after their bounties start?


I have lost my tex file but I still have my pdf, .aux, .bak, .bbl, performance monitor file, and my text document.  Can anyone tell me if I can restore my .tex file from this? In any form?  Addition by Jake: Note that this question is not a direct duplicate of , since that question is concerned only with converting PDF to .tex without any of the additional files that are available in this case.


Sed delete empty lines after a particular line number

I am trying to delete all empty lines after line number 3, till the end of  the file: cat ${File} 1  2 3   4  5  5    6 7    8 9   sed -e '3,${s~^$~~g}' ${File} 1  2 3   4  5  5    6 7    8 9   Observation:  No change in the output. Desired Output 1  2 3 4 5 5 6 7 8 9  Any Suggestions?


Is every set in a separable metric space the union of a perfect set and a set that is at most countable?

I'm reading Baby Rudin and exercise 28 of chapter 2 reads "Prove that every closed set in a separable metric space is the union of a (possibly empty) perfect set and a set which is at most countable." I don't understand why the set must be closed in order for this to be true.  My proof is as follows, and I don't make any reference to the closedness of the set:  Let $E$ be a set in a separable metric space.  Let $B$ be a countable base of that metric space.  Let $P$ be the set of condensation points of $E$.  I claim that $P$ is perfect and $E-P$ is at most countable.  If $p$ is a limit point of $P$, then every neighborhood of $p$ includes at least one point $q$ of P.  For a neighborhood $N_{p}$ of $p$, choose a neighborhood $N_{q} \subset N_{p}$ of $q$.  Since $q$ is a condensation point of $E$, uncountably many points of $E$ are in $N_{q}$, and thus in $N_{p}$.  So $p\in P$ and $P$ is closed.  If $p \in P$, then $p$ is a condensation point of $E$, so every neighborhood $N_{p}$ of $p$ must include uncountably many points of $E$.  If $p$ is not a limit point of $P$, then there exists a neighborhood $N_{p}$ of $p$ such that $N_p$ includes no condensation points of $E$ except for $p$.  This means that every point $q\in N_{p}-\{p\}$ must have a neighborhood $N_{q}$ that does not have uncountably many points of $E$.  For each $b_{k}\in B \cap \mathscr{P}(N_{p})$, choose such a neighborhood $N_{q_{k}} \supset b_{k}$ of some point $q\in N_{p}-\{p\}$.  Now $\{N_{q_{k}}\}$ covers $N_{p}$, and $\bigcup_{k=1}^{\infty}N_{q_{k}}\supset N_{p}$ has at most countably many points of $E$, for it is a union of countably many sets that have at most countably many points of $E$.  This contradicts the assumption that $p\in P$.  So $P$ is perfect.  Let $S=E-P$. There are no condensation points in $S$.  So there exists an open cover $\{N_s\}$, where each $N_s$ is a neighborhood of $s \in S$ with at most countably many elements of $S$. For each $b_{k}\in B \cap \mathscr{P}(S)$, choose such a neighborhood $N_{s_{k}} \supset b_{k}$ of some point $s\in S$.  Then we have a countable subcover $\{N_{p_{k}}\}$ of $S$. As $N_{p_{k}} \cap S$ is at most countable for all $k$, $S$ must be at most countable.  So what am I doing wrong?  Or is Rudin's assumption of closedness extraneous?


Applying for an Irish business visa in the UK with an Indian passport and UK dependent visa

I'm an Indian national and hold an Indian passport with a UK dependent visa stamped. I'm travelling to the UK at the end of this month to visit my wife. I need to travel to Ireland for work in August. Is it possible for me to apply for an Ireland business visa in the UK?


Is there an easy way to return a string repeated X number of times?

I'm trying to insert a certain number of indentations before a string based on an items depth and I'm wondering if there is a way to return a string repeated X times.  Example:  string indent = "---"; Console.WriteLine(indent.Repeat(0)); //would print nothing. Console.WriteLine(indent.Repeat(1)); //would print "---". Console.WriteLine(indent.Repeat(2)); //would print "------". Console.WriteLine(indent.Repeat(3)); //would print "---------".


Possible values for the determinant of $A$ given that $A^3-A^2-3A+2I=0$

We have to determine as a function of $n$, the number of possible values for $\det(A)$ given that $A$ is an $n\times n$ real matrix with $A^3-A^2-3A+2I=0$.  I think the solution is just to notice that this polynomial has one real root $a$ and two complex roots $b,\overline b$. Clearly all of the complex roots of $A$ must be $0,a,b$ or $\overline b$. Since the determinant is the product of the complex roots with multiplicity we just have to find all the suitable combinations for the eigenvalue's multiplicities.  The first option is when $0$ is an eigenvalue.  Otherwise there are $\lfloor\frac{n}{2}\rfloor$ options for the multiplicity of $a$, and this determines the multiplicities of $b$ and $\overline b$ which must be equal.  Hence the answer is $\lfloor \frac{n}{2} \rfloor+1$. Is this correct? How would you make it fancier?


Find the Maclaurin series of $f(x)=\dfrac{1}{1+x+x^2}$ and the radius of convergence of the series.  I can't solve this problem.


Why is the network configuration I set in /etc/network/interfaces ignored on Ubuntu 17.10?

I've just installed ubuntu server 17.10. During installation, it suggested me to connect to the network through wifi, and so i did. After installation was finished and system was rebooted, computer connected to the wifi automatically (which means, it saved the connection creds somewhere). But in /etc/network/interfaces i found nothing. I need my computer connect to wifi network with static ip, so I've put configuration into the /etc/network/interfaces:  # /etc/network/interfaces -- configuration file for ifup(8), ifdown(8) # Generated by debian-installer.  # The loopback interface auto lo iface lo inet loopback   iface wlp2s0b1 inet static         wpa-driver wext         address 192.168.0.12         netmask 255.255.255.0         gateway 192.168.0.1         wpa-ssid *****         wpa-psk **********         dns-nameservers 8.8.8.8 192.168.0.1 auto wlp2s0b1   When system starts, it doesn't connect using my configuration. It does only after  sudo ifdown wlp2s0b1 && sudo ifup -v wlp2s0b1  and after this command, system getting a SECOND IP! Server is still available by the ip it gets from DHCP, and in the same time, it is available by the static ip!


We're learning to play Bridge from Gramma, who played the game a lot ~40 years ago but doesn't really remember the rules (or, at least, the reasons behind some rules and conventions).  One of the things she's adamant about is that the dummy sits the hand out completely, not to touch the cards at all once they're face up on the table.  The rest of us newbies think this is kind of silly - while we know the dummy shouldn't be offering advice, we figure he could could at least handle the cards and play what the leader tells him to play, and (when there's no choice to be made, like when there's only 1 possible card to play), just do the mechanical stuff that requires no decision making.  What are the limitations placed on the dummy player?  Are there etiquette rules about what he can and cannot do?


I am new in Linux so here is my very basic question. I have a directory with 41 folders. I need to create a loop so that the process goes into each folder, copy all the files and then paste everything in a specific folder.   Any idea how to approach this? It would be a lot of clicking without a code solution  In the image you can see all the folders I need to access and the output folder where I want to paste everything (zPASTE_EVERYTHING_HERE)    My path is: /shared/home/data/output  Would like to paste everything in: /shared/home/data/output/zPASTE_EVERYTHING_HERE


How do I install Ubuntu to another partition from Ubuntu with Unetbootin?

Basically what I want to do is install a fresh copy of Ubuntu from Ubuntu. It is an older machine so usb boot doesn't work and I don't see why I need to waste a CD to do it. Currently running Ubuntu 11.10.  I have a 1TB drive and a second 500GB drive for backup. The 1TB drive is partitioned as:  20GB   sda1 Windows XP 20GB   sda3 Free for new OS  ~800GB sda4 Data (ext3) 60GB   sda7 /home (ext4) 20GB   sda6 / (ubuntu 11.10 ext4) 2GB    sda5 swap   After researching I decided that using unetbootin was the best option. I chose Hard Disk (frugal install) and the only option for which disk is "/". That worked and I quickly rebooted into Ubuntu 12.04 live.   Chose to install and picked custom options, set sda3 for / and sda7 for /home. The installer started but hit a wall at detecting other operating systems. It was trying to mount sda6 to find out about the existing os's on the machine, for the purpose of installing grub. And it couldn't umount sda6 because that was currently mounted as cd drive for live cd. I couldn't find an option to make the installer skip this step (I could later fix the grub in 11.10).  I have another drive with 4GB free partition and if I could get unetbootin to install to there it would all work.  So my question is - how do I get unetbootin to install to a different disk for hard-disk install? (I don't think USB Drive mode will work because it will install the grub to that disk -  but I might be wrong!)  or  How to fresh install Ubuntu from Ubuntu?


"looking forward to being". Is this correct?

In order to convey excitement to being a part of a team, which one would you use?     I’m so looking forward to be a part of [team name] that I can barely sleep.   or     I’m so looking forward to being a part of [team name] that I can barely sleep.   Is any of these correct? If not, what would be the proper way of conveying this?


Can tetration 'escape' the complex plane?

Considering subtraction can break out of the natural numbers and into integers, division can break out of integers and into rational numbers, and exponentiation can break out of rational numbers and into irrational and complex numbers...  Can tetration (or more specifically the inverse of tetration) 'break out' of complex numbers and into some other set? And can this be proven?  If not, are there any other hyperoperations that could do so?


How is the likelihood different from the posterior?

I come from an applied mathematics background and have never looked at statistics, but I started studying Machine Learning recently. One thing that I am struggling to understand is: what is the difference between the Likelihood and the Posterior? Bayes' Theorem is given by $$P(A|B) = \frac{P(B|A)P(A)}{P(B)}$$ where $P(A|B)$ is the Posterior and $P(B|A)$ is the Likelihood. If you multiply both sides by $P(B)$ and divide by $P(A)$ you end up with $$P(B|A) = \frac{P(A|B)P(B)}{P(A)}$$ and this looks like the same equation. What is the Posterior/Likelihood now? I want to have a good understanding of the Posterior/Likelihood so if there are any recommended texts, please feel free to share them.


Appearance or appearances: Ambiguity in meaning?

People care way too much about their appearance/ appearances?   Google provides much more evidence for the singular but I have learnt not to trust it. In a formal essay I would opt for the plural since people do not share the one appearance, but I would like some clarification with this if possible.   The older question  is different from mine because the plural form has no other meaning. Whereas the word appearances, the plural can mean physical appearances as it can multiple looks.  Furthermore, it would be incorrect to use the sentence "people love their life" as it implies they share one. Yet lives has two meanings as well. Why is the plural correct in that context? So I was hoping for an explanation on this.


Is adding a parallel word that only intersects the end letter of an existing word allowed in Scrabble?

I won a game by getting lots of points doing it ;) but was contested and I could see their point.   Here are two examples:  PLACES      OTHER   or      BRILLIANT SCORE   I can see from the official rules something similar is allowed:   PASTE BIT   The difference here is that BIT, PI and AT are created. So there is more than one parallel word created.  But are the examples I give only one parallel word is created, is this ok?


How can I add a foreign key when creating a new table?

I have these two CREATE TABLE statements:   CREATE TABLE GUEST (   id int(15) not null auto_increment PRIMARY KEY,   GuestName char(25) not null );  CREATE TABLE PAYMENT (   id int(15) not null auto_increment   Foreign Key(id) references GUEST(id),   BillNr int(15) not null );   What is the problem in the second statement? It did not create a new table.


What is the MAXDOP value for the server which doesn't have NUMA

Im using a SQL Server with the below configurations.   4 Core. 8 Logical processors. No NUMA. NO hyperthreading.   I read this Doc:     Since I don't have NUMA and HyperThread.   So what could be my best MAXDOP setting?


I hear some people read days in names as non-ordinal numbers. Not sure if that is correct.   For example,  25 October is read as "twenty five October" or "twenty fifth October"? Or both?   I am looking for official rule, not slang or casual talk.


Appropriate usage of == and === in JavaScript

I'm new to Java Script  What is the exact difference between (== Vs ===, != Vs !==, etc) in JavaScript? Have read some articles and wanted to be more clear on this. Thanks in advance.


How does system calls work ? What are the operations happen during system call? There are various system call like open , read, write, socket etc. I would like to know how do they work in general ?


Hi I get this error when connecting to SQL Server remotely from a website. I checked the SQL Server logs and get the error:  Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. Reason: Token-based server access validation failed   The SQL Service account is running as LocalSystem. From what I have read, SQL Server service automatically adds this account to SPN on startup.  TCP/IP is also enabled on the SQL Server.  Any ideas on what I need to do? Thanks!


How to convince a Doctoral Committee to accept me as a PhD student when I already have a PhD in a similar field?

I have completed my Ph.D dissertation in Pure Mathematics this year  from a relatively lesser known University. I have been through these questions like  and . However I am interested in pursuing a PhD again in another branch of Mathematics  from a graduate school which is a very well known University. The University where I want to apply  does not have any age limit for pursuing a PhD. I want to shift from my current research field to another field as I have become interested in it recently. I also believe that getting a PhD from top-tier institution will increase my chances for getting a tenure track position. My questions are:  How do I convince the interview committee that I want to complete another PhD in mathematics/Theoretical computer science as I am genuinely interested.  Also I enjoy remaining a student as long as I can. I enjoy taking courses and writing papers. Will that be also a valid reason to tell the interview committee.  My advisor feels that my chances of getting another PhD in Maths/TCS are slim since I already have a PhD and the interview committee would consider this as a waste of time and resource to hire me as PhD student again.   The problem is I don't like the fact that I will no longer be a grad student anymore. I like this whole concept of doing research and getting paid(though meagerly but it still suits me). If someone could help me with my queries, I will be grateful.


how to create a visual web part in the following format

I am a newbie to Visual Studio, it would be great if someone could provide me with an idea how to create the webpart in the following format  Thanks


I just bought my first pizza stone.  The instructions that came with it recommend that I wash it thoroughly with plain water before using it for the first time.  Is there anything else I should do to it to season it so it lasts and performs optimally?


How to post Content with REST api by anonymous user

I have a content type that anonymous user can submit content, Now in a mobile application I want to let them submit content with REST API,   My snippet to submit :   (function($){                      jQuery.ajax({                         url: '/rest/session/token',                         method: 'GET',                         success: function (token, status, xhr) {                             var postData = {}                             postData.title = [{'value': 'My Basic Page'}];                             postData.field_enroll_email = [{'value': 'yusef@gmail.com'}];                             postData.type = 'enroll';                             jQuery.ajax({                                 url: "/entity/node",                                 method: "POST",                                 data: JSON.stringify(postData),                                 headers: {"Accept": "application/json", "X-CSRF-Token": token, "Content-Type": "application/json"},                                 success: function (data, status, xhr) {                                     console.log(data);                                 }                             });                         }                     }); })(jQuery);   this work correctly in browser console when I'm logged in, and When I try it without login return "403 permission is denied". I set permission for anonymous user to create "mycontent1" content. **I want to know how can   anonymous user post content with REST in Drupal? **


D3100 vs D3200 Image Quality both set to 12MP

Both D3100 AND D3200 have similar, almost identical, sensors. Which is going to give the best image quality if I set them both to, for example, 12MP? I also also placed the pixel sizes below.  D3100 - APS-C   23.1x15.4mm     25.1 µm²  D3200 - APS-C   23.2x15.4mm     14.8 µm²


Estimates of the value of a holomorphic function and its derivative

There is a holomorphic function $f$ from the unit disc to itself s.t $f(0)=f(i/2)=0$. How can you prove the estimates $|f'(0)|\leq 1/2$ and $|f(-i/2)|\leq 2/5$?   Applying Schwarz's lemma we can get $|f(z)|\leq |z|$ but this gives an estimate too large. Cauchy's integral formula seems of no use since we don't know anything about other values of the function.


How should I begin and end an email to an institution (like a Consulate) to request some information?

I'm wondering how I should start and end a letter requesting information from a Consulate. Dear Department / Dear Service / Dear Sir/Madam and Yours faithfully?


Query that finds the names of the directors that played in movies that they directed

Given database of the website "eMovies" that manage data about cinema movies.      Write in SQL query that finds the names of the directors that played in movies that they directed     The tables:  Actors      ActorID      PK     Firstname      LastName  Directors      DirectorID   PK     Firstname      LastName  Genres      GenreID      PK     GenreDescr   Movies      MovieID      PK     MovieName      Year  ActorsMovies      MovieID      PK     ActorID      PK   DirectorsMovies      MovieID      PK     DirectorID   PK   GenresMovies      MovieID      PK     GenreID      PK    My attempt:   SELECT Directors.FirstName, Directors.LastName  FROM Directors, DirectorsMovies,ActorsMovies  WHERE Directors.DirectorID=DirectorsMovies.DirectorID=ActorsMovies.ActorID  GROUP BY FirstName,LastName;   In the output I see an empty table, someone can tell me why and how can I improve my code? or any other working code please?.


Summarize the mathematical problem at the heart of breaking a Curve25519 public key

It's pretty easy to generate a Curve25519 private key: generate 32 random bytes of data and then do:  e[0] &= 248 e[31] &= 127 e[31] |= 64   You can then generate a public key by doing  on the private key. For example, here's a random keypair I just generated:  public: e40ed268dff20db8497d0691421d00b086aad1efedcd5bd223d9eb6c0b85665f secret: e3c0e8b20ba7894882ddb37522dbe90867befcf9f31a5ce29c0d7997e0bd856d   The whole safety of public key encryption is that it is hard to take a public key and reverse the operation. Elliptic curve cryptography, as I understand it, relies on the fact that a  is hard to find. In particular, for a given large b and g, it is hard to find an integer k such that  $b^k = g$  How does that equation relate to Curve25519? Specifically, if I had a public key like the one above, how would I express, in math terms, the problem I need to solve to find the private key? How does it relate to the equation I see from time to time - $y^2 = x^3+486662x^2+x$, and the number $2^{255} - 19$?  I am guessing it is not as simple as "the private key is k and the public key is b and/or g" in the equation above. I'm also a little confused because the keys would appear to have roughly the same number of digits, which would seem to imply that there aren't many feasible values for k?


Principal prime ideals are minimal among prime ideals in a UFD

Fulton, "Algebraic Curves," Exercise 1.39(a):     Let $R$ be a UFD, and $P = (t)$ a principal, proper, prime ideal.    Show there is no prime ideal $Q$ with $0 \subset Q \subset P$.   After being stumped for some time, I came up with the following proof while attending a concert (my ears are still ringing an hour later):     Suppose there is such an ideal.  Take some $0 \neq q \in Q$.  Since $Q \subset P$, $q = rt$ for some $r \in R$.  Since $Q$ is prime, and $t \not \in Q$ by assumption, we must have $r \in Q$.  Applying the preceding to $r$ instead of $q$, we have $r = r't$ for some $r' \in Q$.  So $q = rt = (r't)t = r't^2$.  Proceeding along these lines, $q$ is divisible by $t^n$ for all $n \geq 0$.  Notice that $t$ is irreducible, since $P = (t)$ is prime.  Now, what possible factorization into irreducibles could $q$ have?   So far as I can tell, this seems to work, but it also seems exceedingly silly.  What's the "right" way to prove this?


I've seen a number of contracts for "conduct a survey near X at Y altitude".   How do I find point X in relation to the space center? It doesn't look like the space center is marked on the planet, so how'd I even know which way to go?  I'm playing on version 1.0.


Is having a skills bar chart on a resume a good idea?

I was looking at the resume in  question, and I noticed the skills bar chart. I've seen this on several designers' resumes and was wondering if it is a new fad, if it's something that I should consider adding to my resume/website, etc.    Wouldn't this get you less clients if you forget or didn't have the room to add every single piece of software that you know and your skill level of said software? I can understand adding fundamental software like Photoshop and Illustrator, but what about all the little programs that I don't use very often, but I still know how to use? If I were to list all those, the resume would be like 3 pages long.  Is this a useful graphic to add?


i want to apply parent with autumatic weight but its error and said that Error bone heat Weighting  and i read over the internet and nothing works, anyone can suggest a solution? note.. i tried single bone to make feet bone to head bone and its work but when i make the hand bone the error comes out


Multiple Operating Systems or ISO's Bootloader for a USB Stick?

I have no idea how to do this.  I have 7 iso's that I want to be able to easily boot from using a USB Stick and they are:   Windows 7 Ultimate x86 Windows 7 Ultimate x64 Windows 8.1 x64 Hirens BootCD Ultimate BootCD Windows XP Professional Ubuntu   Basically, I want to be able to boot my USB stick and instead of it just loading a single OS (like it does at the moment) I want a list of options ^ like above that I can choose and it will load that OS/ISO.  Any ideas how this can be achieved?


How do I remove snap? apt pretends it's not there but I can still call commands with it.  Trying to rm it says "read only file system"  root@tunnel:/# apt remove snap Reading package lists... Done Building dependency tree Reading state information... Done Package 'snap' is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. root@tunnel:/# snap whoami email: -


Combining secure hashes with insecure hashes?

Assuming I'm a bank which seeks for secure hash functions to use in the process of  signing on digital contents.  I'd like to explain / prove why using each one of the following hash functions might be less secure than using SHA-1 (yes, I know SHA-1 no longer considered secure, but the question does consider it as one, or at least states "do not be less secure than sha-1").   $h_{666}(m) = $ some new hash function with 666 bit long output. $h_{ib}(m)=h_{sha-1}(h_{md5}(m))$ $h_{hm}(m)=h_{md5}(m) \oplus h_{sha-1}(m) \oplus h_{ib}(m) \oplus h_{666}(m)$, while the XORing operation here xors the matching bits between two outputs, padding with 0s the smaller ones.   I would say…   I can tell that using new hash function is a bad idea since no one has yet to research and attack it, aside from the fact that more bits is less efficient. Apart from this explanation, I don't see other reason to disqualify this answer. md5 is broken and collisions can be made quite easy, so two different inputs to this function can collide and have the same input to the sha-1 function, which will result in collision between the final outputs. I have no clue how to disqualify this one. The intuition says 'xoring with bad hash functions is not a good idea', but I can't really justify my answer. I also think the padding doesn't actually affect anything, becuase if SHA-1 result is secure then padding 0s to it won't make it collide with other inputs suddenly.   Am I correct, or did I miss something obvious somewhere?  Edit  This is different from  since here the idea is to combine unsecure hash with a secure one. This is not about just combining hashes.


I am using wordpress 3.2 and I did a query post like this:  <?php query_posts("posts_per_page=1post=type&page=post_parent=10");?>   Then I try to echo out the date of this post I queried like this.  <?php echo the_date(); ?>   It gives me the title of the post and the excerpt and the permalink but no date. What do you think the problem is. I'm sure it's something quite embarrassing.  Here is the code in my template file for the video page:      <?php query_posts("posts_per_page=1post=type&page=post_parent=10");?>
Recent Video

<?php echo the_date(); ?>

<?php echo the_title(); ?><?php echo the_excerpt(); ?>

<a href="<?php echo the_permalink(); ?>" class="more2">Watch Now
   Here I try to put the query in a loop:  <?php query_posts("posts_per_page=1post=type&page=post_parent=10");?> <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
Recent Video

<?php echo the_date(); ?>

<?php echo the_title(); ?><?php echo the_excerpt(); ?>

<a href="<?php echo the_permalink(); ?>" class="more2">Watch Now
 <?php endwhile; else: ?>
<?php _e('Sorry, no posts matched your criteria.'); ?>
 <?php endif; ?>   the_date() did not work but the the_title() and other functions worked. By the way this changed my query to the_post() which is not what I'm wanting. I want to query the latest video like I did above the loop.  By the way I used the_date function earlier in the page and it worked. Could that be the problem? Here is it before the code that I had a problem with.
     <iframe id="video" src="http://www.youtube.com/embed/videoseries?list=<?php print get_post_meta($post->ID,"playlist_id", true); ?>" width='560' height='350' frameborder="0">

<?php echo get_post_meta($post->ID,"speaker", true); ?>

<?php echo the_date(); ?>


Trying to compute   I was facing: \begin{align}J=\int_0^\infty \frac{\ln\left(1+x-\sqrt{2x}\right)}{1+x^2}\,dx\end{align}  I want to prove that $\displaystyle J=0$, or equivalently, that,  \begin{align}\int_0^1 \frac{\ln\left(1+x-\sqrt{2x}\right)}{1+x^2}\,dx=-\dfrac{1}{2}\text{G}\end{align}  $\text{G}$ being the Catalan constant.  Read carefully please.   I know, using so-called Feynman's trick, how to prove this. I would like to obtain a proof, using only integration by parts and change of variable in simple integrals (that is, no multiple integrals) I don't know, if, under these restrictions, such computation is possible.  NB: You're probably wondering what is the link between : $\int_{0}^{\frac{\pi}4} \ln(\sin{x}+\cos{x}+\sqrt{\sin{2x}})dx$ and $J$.  The link is, for $x\in\left[0;\frac{\pi}{2}\right]$, $(\sin{x}+\cos{x}+\sqrt{\sin{2x}})(\sin{x}+\cos{x}-\sqrt{\sin{2x}})=1$ and $\sin(2x)=2\sin x\cos x$


Alsa driver update in client machine without make

I have a linux system and updated alsa from 1.0.23 to 1.0.25, It works as expected.  Steps which I performed to compile:  ./configure make  make install  Now , I have 100's of client machines in which I need to deploy this ALSA update. But, these machine does not have make/setup tools install.  To deploy this update what is the best way?  I even tried creating a package using CHECKINSTALL.  So, with created package I deployed it in 5 machines, in 3 machines the driver got updated and 2 machines reports no information on soundcard.  Am i missing something.


Proof of de Broglie wavelength for electron

According to de Broglie's wave-particle duality, the relation between electron's wavelength and momentum is $\lambda =h/mv$.  The proof of this is given in my textbook as follows:   De Broglie first used Einstein's famous equation relating matter and energy, $$E=mc^2,$$ where $E=$ energy, $m =$ mass, $c =$ speed of light. Using Planck's theory which states every quantum of a wave has a discrete amount of energy given by Planck's equation, $$E=h\nu,$$ where $E =$ energy, $h =$ Plank's constant ($6.62607 \times 10^{-34}\:\mathrm{ J\:s}$), $\nu =$ frequency. Since de Broglie believes particles and wave have the same traits, the two energies would be the same: $$mc^2=h\nu.$$ Because real particles do not travel at the speed of light, de Broglie substituted $v$, velocity, for $c$, the speed of light: $$mv^2=h\nu.$$   I want a direct proof without substituting $v$ for $c$. Is it possible to prove directly $\lambda=h/mv$ without substituting $v$ for $c$ in the equation $\lambda =h/mc$?


I want to override this filter to return number 5 instead of that variable This is set in parent theme add_filter('drile_loop_product_variable_color_number', function() use ($number_color_swatch){     return $number_color_swatch; });  I want to override this in child theme functions.php  and make it return "5"


Garbage Collection: Is it necessary to set large objects to null in a Dispose method?

Is it necessary to set large objects to null when implementing a Dispose() method?


Nikon D3200 - protection against snow, cold and rain, and how well does it work in -20/-30C? No tripod!

I know that the battery stops working when it gets too cold and I'd need to warm it up again, but other than that, is there anything else that I'd need to know if I want to shoot in -10C or -20C or even -30C? Do I need some sort of protection for the camera? And how can I protect it against condensation when walking inside, the temperature difference apparently can be 40C! I suppose I'd need to buy some kinda backpack or something and put it inside, but I doubt that that would help.  As for rain, is there some sort of protection? I've seen people mostly shooting with bare cameras in the rain, and I think once or twice I've seen people with a plastic bag wrapped around the camera (including the lens). It looked goofy and extremely uncomfortable to use from the looks of it, so I presume that's the protection from rain... But is there some sort of a different protection? Maybe I could seal up the camera with some plaster or something like that?  And what about snow? Would I still need the protection when it's snowing? After all, snow would only be 'wet' if it melted.  Any other tips would be useful... This is my first DSLR.  Note: I'm talking about walk-and-shoot kind of photography, where you stop for a few seconds to set the right settings and take the shot, then keep walking, not a tripod. The tips I've found so far seemed for a tripod and such, offering a hood-like cover.


I'm looking for a LaTeX code sniffer and/or code beautifier, because I'm creating a CI server for my LaTeX books and I wanted a few things. :D


How to replace an old version of Ubuntu with a newer one from USB/DVD?

I dual booted ubuntu 11.04/11.10 a while ago with a USB stick and i want to uninstall it.   I would like to completely uninstall the old version and get 12.04.  I have a 64 bit laptop. Please help!


In the following example, is it appropriate to use a or an as the indefinite article, and why?     He ate __ green apple.   I know that in the case of just "apple", it would be "an apple," but I've heard conflicting answers for "green apple," where the noun is separated from the article by an adjective.  Also, which is more appropriate in this case:     He ate  __ enormous Pop-Tart.


Can I get a tax deduction for education expenses?

I work as a Computer Programmer for a Healthcare Company. I am in the process of applying for Part Time - Master's Graduation Program in Healthcare.  I wonder whether i would be able to get Tax Deduction for the expenses incurred in Master's Graduation.  I live and work in NJ, Most likely, I would be admitted for the program in NYC.


Creating a user valid for a given time period?

I wan to create a user on Ubuntu valid for 10 min. How can I do that if it's possible?


Prove if $p,q∈R$ and $pq>0$ then either $p>0$ and $q>0$, or, $p<0$ and $q<0$ using only the field axioms.  I have no idea how to do this using only the field axioms. Seems pretty straightforward but how would you approach this question using only the field axioms. Remember the premise here is $pq >0$ and we must begin with this to prove the "then either .... or ....". I've seen similar questions to this but the implication is usually the other way around. Eg. we begin with if p>0 and q >0 then pq >0 which is a lot easier to prove. But how do we do it the other way around while only being able to use the field axioms.  Edit: These include distribution axioms, order axioms, ordered field axioms.  Edit: I know the question is similar but the answers don't take pq >0 as the premise. I really need help/hints for this question and any help would be appreciated.


How do i dereference some files in my git repo

When working on my Cordova project, I didnt have a .gitignore file, so when i committed everything (by way of git add *, it seemed to commit all my platforms, .idea, and plugins.  So, this is now pushed to GIT, but I wanted to dereference them, so they arent downloaded in the future.  I just created a new Cordova .gitignore as follows.    #Cordova Info platforms/ plugins/  # ANDROID / ECLIPSE  # built application files *.apk *.ap_  # files for the dex VM *.dex  # Java class files *.class  # generated files - android project subfolder Android/bin/ Android/gen/ Android/assets/  # generated files bin/ gen/  # Local configuration file (sdk path, etc) local.properties  # IOS / Xcode build/* *.pbxuser !default.pbxuser *.mode1v3 !default.mode1v3 *.mode2v3 !default.mode2v3 *.perspectivev3 !default.perspectivev3 *.xcworkspace !default.xcworkspace xcuserdata profile *.moved-aside IOS/www/  # OSX .DS_Store  # Thumbnails ._*  # Files that might appear on external disk .Spotlight-V100 .Trashes     I ended up grabbing the "PhoneGap GitIgnore" and added platforms and plugins to it at the top.  So it comes down to 'how do i unlink the platforms and plugins folders and is this a solid gitignore for Cordova 6.3.0' ?


Closely related to  from a few weeks ago, but the answers didn't discuss how to do the . Here's the situation:  We now 15 GB data in a database, but a logging bug in an application ran wild and ran this up to 80GB data giving us DB files around 130GB. We've fixed the bug, cleared out the affected tables, and I'd like to get some of the space back, maybe bring the DB back down to 40GB or so.  The biggest reason I'd like to do this is so that we can more easily restore backups to smaller drives on virtual test instances.  I get it: Shrink is evil, and will fragment both indexes and on-disk file. I'm sold. This is a one time event.  So how can I minimize the pain? Seems like I should:   Use DBCC SHRINKFILE (DataFile1, 40000); to aim for 40 GB.  Immediately use some smart reindexing to reorganize and rebuild indexes Defrag physical disks   Will that appropriately mitigate the side effects of a shrink? Or is this only going to end up on my application for the Evil League of Evil?


How to import a collada model with textures?

I have found very good collada model . It comes with the texture files.   But, when I import it into Blender, it has no textures at all.    So, how to import collada model with textures into Blender?  Thanks a lot!  UPDATE:  I know for the . but I don't need to add textures after, I need to import them properly...


Would it be possible to add another "Add to answer" button directly after the question on the mobile app? After browsing the , I had to scroll past 51 one answers so I could add my bug finding.  I guess it makes sense to force people to scroll through answers so they could see them and avoid duplicates, but it seems counterintuitive when there are questions like these.


Proof of weaker Baker-Campbell-Hausdorff Formula

Prove the weaker form of the BCH Formula:  $$e^A e^B = e^{A + B + \frac{1}{2}[A,B]} $$  with the assumption $[A, [B, A]] = 0; [B, [B,A]] = 0$  Start with $f(\lambda) = e^{\lambda A} e^{\lambda B} e^{-\lambda (A + B)}$ and establish the differential equation $\frac{df}{d\lambda} = \lambda [A, B] f.$ Then integrate it to obtain the formula.  What I did is I worked backwards.It is very easy to see that  $$ \frac{df}{d\lambda} = \lambda[A,B]f$$ $$ \frac{df}{f} = \lambda[A,B] d\lambda $$ $$ \log f = \frac{\lambda^2}{2}[A,B] $$ $$ f = e^{\lambda A} e^{\lambda B} e^{-\lambda (A + B)} = e^{\frac{\lambda^2}{2}[A,B]} $$ $$ e^{\lambda A} e^{\lambda B} = e^{\lambda (A+B)} e^{\frac{\lambda^2}{2} [A,B]}$$ then take $\lambda = 1 $ to obtain  $$e^A e^B = e^{A + B + \frac{1}{2}[A,B]} $$  Now the hard part is obtaining the differential equation. $$f(\lambda) = e^{\lambda A} e^{\lambda B} e^{-\lambda (A + B)}$$ $$ \frac{df}{d\lambda} = Ae^{\lambda A}e^{\lambda B} e^{-\lambda (A+B)} + e^{\lambda A} Be^{\lambda B} e^{-\lambda (A+B)} - e^{\lambda A} e^{\lambda B} e^{-\lambda (A + B)} (A+B) $$  The best I could make from this mess was  $$ \frac{df}{d\lambda} = [A,f] + e^{\lambda A}e^{\lambda B} [B, e^{-\lambda (A+B)}] $$  It's really difficult for me to be able to use the assumptions $[A, [B, A]] = 0; [B, [B,A]] = 0$ nor make $\lambda$ come down the exponent in the differential equation.   Can you please give a hint on how to proceed with this problem? Any helpful hint will be extremely appreciated! Thank you in advance!


does top-level domain name affect user experience?

does these new top-level domain names (.guru, .rocks, .ml, .tk) affect user experience? do they like to type generic top-level domain names only?


What does a Game Designer do? what skills do they need?

I know someone who is thinking about getting into game design, and I wondered, what does the job game designer entail? what tools do you have to learn how to use? what unique skills do you need? what exactly is it you'd do from day to day. I may be wording this a bit wrong because I'm not sure if the college program is become a game designer or learn game design. but I think the same questions apply either way.


I have a string which I want to insert an other string into. For this I use the method string.Format() but it doesn't work since my basestring include {-signs. As soon as I remove them from my string the code works fine.   string baseString = "This is my base string and when it includes {-signs it {0}.";  string insertString = "doesn't work";  string completeString = string.Format(baseString, insertString);   Does someone have a glue about why it doesn't work?


I made a new math symbol by rotating an existing math symbol. Now I would like to use it in the caption of a table. However, it does not compile. Here a minimal working example: \documentclass{article}  \usepackage{graphicx}  \newcommand{\nw}{\rotatebox[origin=c]{180}{$w$}}  \begin{document}  \begin{table}     \centering     \begin{tabular}{c|c}         some & table     \end{tabular}     \caption{$\nw$} \end{table}  \end{document}  Did I mess something up? If not, what would be a good workaround?


I've recently upgraded to 13.10 and I can't find the option to hibernate. My computer doesn't play ball when I suspend it (screen doesn't reactivate upon lifting the lid) so in 13.04 I always used hibernate when lid closes. That option has now disappeared. When I go to power options the option to hibernate is not listed under "Close lid" actions. The only options are suspend and do nothing. I had this same problem with 13.04 but did the following to fix it:   Altered the file /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla to say  [Re-enable hibernate by default] Identity=unix-user:* Action=org.freedesktop.upower.hibernate ResultActive=yes   I've tried this again after the update and it doesn't appear to be solving the problem.


When is $\sqrt{x/y^2}$ equal to $\sqrt{x}/y$?

The solution to the quadratics is given by  $r = -\dfrac{b}{2a}\pm\sqrt{\dfrac{b^2-4ac}{4a^2}}$, which is shortened to $r = -\dfrac{b}{2a}\pm\dfrac{\sqrt{b^2-4ac}}{2a}$, but I'm wondering how if this is justified, given that $4a^2$ can be negative if $a \in \mathbb{C}$, and $\sqrt{\dfrac{x}{y}} \neq \dfrac{\sqrt{x}}{\sqrt{y}}$ if $x$ and $y$ are negative, but given that we have $a^2$, is this justified?  Is $\sqrt{x/y^2} = \sqrt{x}/y$? Is $r = -\dfrac{b}{2a}\pm\dfrac{\sqrt{b^2-4ac}}{2a}$ always true?


Is it OK to edit a correct answer for fullness instead of answering?

So I went to a question I had an answer for and noticed that the op had already voted an answer as being correct. The particular answer had a list of links.   So I thought to myself, wouldn't it be better to have a more complete correct answer instead of having more smaller answers? In other words, instead of adding a new answer I edited the correct one and added the link there.  I find it better for two main reasons: a) the correct answer would be more complete and b) I am not looking for votes, any votes will go to the guy with the correct answer.  In case it matters, the question was:


I made two river bank lines and I want to associate them.    I want to make a centerline using two rows as a base. I managed to make the centre line with a lot of work creating several lines from one margin to the other of the river and then using the centroid, but this solution is very tiring and I have to do this in several areas.


The coordinate of the centroid of a polytope in n-dimension

Is it true that the coordinate of the mass center of a convex polytope (constructed by n vertices) in a n-dimensional space is actually the average of all the vertices' coordinates? If so, how to prove it?  For example, say we have a convex polytope with vertices $(x_{11}, x_{12}, ..., x_{1n}), (x_{21}, x_{22}, ..., x_{2n}), ..., (x_{n1}, x_{n2}, ..., x_{nn})$, is it true that its mass center (mass is uniformly distributed over the polytope) is at $\frac{(x_{11}+ x_{21}+ ... +x_{n1})}{n}, \frac{(x_{12}+ x_{22}+ ... +x_{n2})}{n}, ..., \frac{(x_{1n}+ x_{2n}+ ... +x_{nn})}{n}$?  Thanks!


Why does closed questions not appear on the highest voted page

One of my favorite past times include browsing through questions with the highest votes. They often give me valuable information and insights which I normally wouldn't come across.   for example. It's one of the highest voted questions yet it doesn't appear when I sort the questions by votes. I accidentally discovered that question while randomly browsing through the site, but I'm wondering how many questions I haven't been able to find because they are closed.  Now I'm sure the question has been closed for a very good reason but such questions have valuable content to many users.   What is the reason for hiding closed questions from the highest voted list? Is there an option to include them? Can StackExchange consider including such option?


cmd equivalent to "cd ~" to change to C:\Users\\Documents\

I have to switch to Windows for the duration of a project.   I have only just started, and I already dislike using cmd.  Is there a shortcut for C:\Users\<current user>\Documents\ ?


I have an Edirol UA-101 worked perfect on windows 10 and on Mac El Capitan. Now I switched to an Imac 2010 I5 8GB ram with high sierra but the system doesn't see it. How can i install the driver? In the system report i can see the UA-101 Connected on my USB port


I'm using these commands:    du -sh --apparent-size ./* du -sh ./*   both reporting:    4.0K    ./Lightroom_catalog_from_win_backup 432M    ./Lightroom catalog - wine_backup   while those directories contain:    $ll ./"Lightroom catalog - wine_backup" total 432M -rwxrwx--- 1 gigi gigi 432M Mar 18  2018 Lightroom 5 Catalog Linux.lrcat -rwxrwx--- 1 gigi gigi  227 Nov 21  2015 zbackup.bat $ll ./Lightroom_catalog_from_win_backup total 396M -rwxrwx--- 3 gigi gigi 396M Dec 17 09:35 Lightroom 5 Catalog Linux.lrcat -rwxrwx--- 3 gigi gigi  227 Dec 17 09:35 zbackup.bat   Why du is reporting 4.0K for ./Lightroom_catalog_from_win_backup and how could I make it to report correctly?  PS: other system information:    $stat --file-system $HOME   File: "/home/gigi"     ID: 5b052c62a5a527bb Namelen: 255     Type: ext2/ext3 Block size: 4096       Fundamental block size: 4096 Blocks: Total: 720651086  Free: 155672577  Available: 119098665 Inodes: Total: 183050240  Free: 178896289  $lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description:    Ubuntu 16.04.5 LTS Release:        16.04 Codename:       xenial


can i install both windows 10 and ubuntu in my 4GB Ram Laptop?  i want to give it a try but i fear that windows 10 might not be able to run smoothly after the process..  what are the requirements and under what circumstances can the two operating systems smoothly run?  please help


To put it simply, I don't want to just switch black to alpha. I want to make it so that the more black a pixel is, the more alpha it has. I've got this nebula I made following a tutorial:  The image shown doesn't do it justice; there's a lot of very minor flushes of color around the nebula that I need to keep. As you can see, it's also black.    I want to make it so that the more black an image has, the more alpha it has. How would I do this in Photoshop (CS6)?


This question seems to have been asked  already. My IT department installed the OS so I don't know how to register it properly but I do have root access. Is there a way to get the same packages using the CentOS repositories maybe? I'd also like to install IceWM but without a compiler I can't even build it myself.


How to Separating Two Objects that were never merged

Hi I am having an issue trying to figure out how to unmerge two objects that weren't even merged to begin with.  I'm creating a 3D character and have made the body. I then added a cube using (Shift+A) to add the new cube shape then off to the side started to make and form the left hand and am using the mirror affect as well so it's the exact same on the other side. Now I haven't merged the two object at all, yet when I hit Tab or A to highlight the Hand object it highlights both the (hand) and the (main body).  I can't move the hand I finished to the arm of the body part to the character I'm creating, instead both the body and the hand move together whenever I try to move the hand anywhere around the grid.  I have looked at videos and read articles to figure out how to have them both as separate objects. I have tried to hit P to un-join them doesn't work, I have tried to hit L to highlight the island of the hand but doesn't work.  I am fairly new at Blender but getting the hang of it so far I'm just stuck in trying to have both object move freely on their own so I can move the hand to the body and join them but instead both the hand and the body move together and I don't know what to do.  Please can you help with this I'm doing this for a friends company and need this project done by next week but this issue is holding me back.  Thank you.


Prove that $\lim \limits_{x \to 0} {\sqrt{x+2}}=2$ (using Epsilon-Delta)

Can someone please guide me through the solving of $\lim \limits_{x \to 0} {\sqrt{x+2}}=2$ using the Epsilon-Delta definition?   I understand how to use $\epsilon-\delta$ in general cases and I know, so far, that: Let $\epsilon > 0,$ $$\left|\sqrt{x+2}-2\right|<\epsilon\ whenever \left|x-0\right|<\delta$$ $$-\epsilon<\sqrt{x+2}-2<\epsilon\ whenever -\delta<x<\delta$$ Let's solve for $-\epsilon<\sqrt{x+2}-2<\epsilon\\2-\epsilon<\sqrt{x+2}<\epsilon+2\\(2-\epsilon)^2<{x+2}<(\epsilon+2)^2\\\epsilon^2-4\epsilon+2<x<\epsilon^2+4\epsilon+2$     And here I'm stuck. Is this even the right way to do it ?


'It's great fun to play with somebody.' vs 'It's great fun playing with somebody.'

I wonder if anyone here can help: 'It's great fun to play with him' and 'It's great fun playing with him'. Are they both correct? I feel the second one sounds more natural, but how about the first one? Many thanks!


Book suggestion for a first course in abstract algebra

I am self learner currently learning mathematics. I am studying elementary real analysis from Stephen Abbhot's book and i have some experience with proofs also from book "How to prove it". I would like to embark on journey to abstract algebra. I have looked similar suggestions here and came up with two books which are as :  1. Abstract algebra by Charles Pinter  2. A first course in abstract algebra by J.B.Fraleigh  I would like to know any more books which are available for self study so that i can have a look at them before buying and advice in general to subject.  Thanks


Alternative way to prove that the sum of the square reciprocals is ${\pi^2}/6$

When I learned about how the sum of a series could be divergent and convergent, I decided to try to find the sum of the square reciprocals to no avail. The proof, obviously at not my level as you can tell, was too difficult to understand (what math branch is required because they mentioned something a Riemann Zeta function).  Is there an alternative proof that would yield the result ${\pi^2}/6$ as well without higher math?


How can I run Maniac Mansion through ScummVM?

Day of the Tentacle Remastered Edition includes Maniac Mansion as a .  The game appears to be exactly the same as the old DOS release (albeit, the enhanced version).  If possible, how can I run this game through ScummVM?  Pointing ScummVM at my installed game doesn't work.  What do I need to do to play this version of Maniac Mansion?


what is the difference between method(String str) and method(Final String str)

The use of Final keyword inside the method argument puzzles me  public void helloWorld(String str) {  }   public void helloWorld(Final String str) {  }  What is the differences between them?


I've applied for a visit visa to spend my paid annual leave with my fiancée - 10 days ( British Citizen ). Although I 've submitted all the requested documents ( signed application form, Employment letter, 6 months bank statements, salary slips for 6 months, copy of residency card, copy of my property contract, my old passport, my fiancee's bank statements for 6 months, mortgage statement, p60, invitation letter, copy of her passport ) they still refused my application although I've complied with my last visa conditions. Could you please help explaining this refusal letter?


"The predecessor of company A is B" vs. "the predecessor of company A was B"

I'm working on some company profiles. I am wondering about the tense of verb in this sentence:        The predecessor of company A is B.     The predecessor of company A was B.      Which is the correct one?


Does the Lucky feat allow the character to see the enemy's die roll?

If an enemy B attack a character A, where A has the Lucky feat, and A wants to spend a Luck point, in which moment can character A can spend that Luck point?     Can Character A see/know the natural result of Enemy B's roll before deciding whether or not to use a Luck Point?   If no, Can Character A see/know the natural result of Enemy B's roll after deciding to use the Luck Point,but before choosing which die?


Rational doubt ( doubt in rational number)

If there is a prime number x, if we reciprocate it we will get 1/x.   Reciprocal of prime number will be a rational number , Except 1/2 and 1/5 ,  every number which is reciprocal of prime number is a recurring non terminating decimal number.  Question- How to find that after how many digit recurring numbers will repeat ?  How to find the recurring numbers?


My question is about the following claim:     For $n \geq 2$, let $A\subset \mathbb R^n$ be a non-empty, open, bounded set. Assume $A$ and its complement are connected and $\text{int}(\text{cl}(A)) = A$. Then $\partial A$ is connected.   Without the assumption $\text{int}(\text{cl}(A)) = A$, the statement is false (just take any open set and remove an interior point). This condition is not necessary but I think it is sufficient to get the claim.  This seems a trivial matter, but I cant's find a proof using only basic topological tools. Does anyone know something about this ? Thank you very much.


So I wanted to render a my model in a video scene, and after setting up the tracking scene I can see that in render view, both the model and the floor are visible (along with the shadow casted). What I wanna do is that I wanna make the floor invisible ( i.e., blend in with the actual scene ), but then the shadow disappears too. Is there any way of casting the shadow without the floor?


Can previous villagers from Animal Crossing: New Leaf move back in?

My favourite character from Animal Crossing: New Leaf, Chief, moved out about a month and a half ago. Some people are saying old villagers who moved out can move back in again. Can previous villagers move back in to my town? And if so, can I do anything to make it happen?


About a harmonic function in the upper half plane

I'm struggling with the following question: Suppose that $C$ is a positive constant, $u$ is harmonic in the upper half plane $\mathrm{Im}z>0$, and that $0 \le u(z) \le C\mathrm{Im}z$ for $\mathrm{Im}z>0$. Prove that there is a constant $c \in [0, C]$ such that $u(z)=c\mathrm{Im}z$ for $\mathrm{Im}z>0$. Hint: Consider the function $\tilde u$ defined by $\tilde u(z) = \begin{cases} u(z), & \mathrm{Im}z>0 \\ 0, & \mathrm{Im}z=0 \\ -u(\bar{z}),& \mathrm{Im}z<0 \end{cases}$ Show first that $\tilde{u}$ has the mean value property in $\mathbb{C}$.    I already proved that $\tilde{u}$ has the mean value property, but I'm not sure what to do next. Since $\tilde{u}$ is harmonic in $\mathbb{C}$, I set an entire function $f$ such that $\mathrm{Re}f=\tilde{u}$, and I'm trying to deduce that $f$ is injective, so $f(z)=az+b$ for some constant $a, b$. I'm stuck in there and completely lost my way. Does my approach correct? Or should I try another method?


I know the title is little bit challenging but maybe most of you heard about the last BICEP2 paper on February. As I have read about it  and . My understanding is, BICEP2 results released on March, revealed  and physicists support this observation with inflation theory. But the last paper published that these B modes represent of a cosmic high-dust.   I am not expert in cosmology but the inflation theory makes sense for many physicists. Now is it all dead or new findings twisted a little bit?


How to add linenumbers to figure captions?

I'd like to add linenumbers to my TeX-file. I found the packe lineno which I'm using as follows:  \usepackage{lineno} \linenumbers   Unfortunately line numbers are not added to the figure captions and table captions. Is there an easy way to also include captions to the line numbering?


Last year I visited the USA the first time as a student.  Hence I filled in no previous employer and that I was a student.   Since then I graduated and got a job. My ESTA is still valid for my next trip, so I am wondering whether I can still use it?  Or should I get a new one to reflect that I am no longer a student?