I read a short story, can’t remember if it was part of a larger narrative or just on its own.  It was about a crew that was taking a bunch of space tourists to a planet that had plants with seeds in glass-like structures that make certain sounds. The main character in this story feels connected to this planet because there’s a Valley of Sound, where there’s a large number of these glass plants that make all sounds imaginable.  People can almost pick out a loved one’s voice for instance. I absolutely love this concept but can’t for the life of me remember what the story/book was called!


Unable to activate Workspaces ccsm / dash / dconf ubuntu 13.04

I ran the latest updates and as usual I had to re-install my video driver, download the headers and blah blah...  I ran into a few troubles that I was able to fix and at the end I got my Ubuntu up and running, Unity working, OpenGl working without a single problem... games running fine but wait.  I have only 1 worspace !  oooh no problem, lets ccsm to fix that... nope it has no effect. Well, we can activate the workspaces on dash --> Appearance... nope, nothing happends.  Oooooh yea, the dconf editor !!  I will force those workspaces thru that method aaaaaand  :/ nothing once again.  :(  Maybe im missing something, maybe I missed something in this forum... but I cant find a way to fix those worspaces. I can only have 1 and thats it.  Does anyone had thtis problem before? Can I has my workspaces back? I only need 4  :(


What do you call a person who appears to be oblivious to their ignorance?

What is the appropriate name for a person who exhibits the behavior described below?  A person who speaks in a Confidently informed manner (about a technical process or procedure for example) however they are actually imparting incorrect information and are apparently oblivious of their actions.


How can I make my condition check case-insensitive?

My first Python program gets an input from the user about his birthday and calculate if he or she is 18+.  My while loop won't continue if the string "check" is equal to true; it's only working for True. Why not?  import time import datetime  check = "Null" year_born = month_born = day_born = 0  while check != "True": #or check!="true":         year_born = input("what year were you born?")         month_born = input("what month were you born?")         day_born = input("what day were you born?")         check = raw_input("your birth day is on {0}/{1}/{2}... type 'True' to confirme: ".format(day_born, month_born, year_born))  year_now = int(datetime.date.today().strftime("%Y")) month_now = int(datetime.date.today().strftime("%m")) day_now = int(datetime.date.today().strftime("%d"))  if (year_now - 18 > year_born) or (year_now - 18 == year_born and month_born <= month_now and day_born <= day_now):         print("You are 18+. you are allowed to enter")  else:          print("Good bye")   I tried while check != "True" or "true" and while check != "True" or check != "true" and while ((check != "True") or (check != "true)). None of them seem to work; it's just ignoring "true" and "True" and keeps looping.


Are linear transformations $T_1$, $T_2$ invertible?

Let $T_1, T_2$ be two linear transformations from $\mathbb{R}^n$ to  $\mathbb{R}^n$. Let $\{ x_1, x_2,....x_n\}$ be a basis of  $\mathbb{R}^n$. Suppose that $T_1  x_i \neq 0$ for every $i= 1,2,...,n$ and that $x_i \perp $Ker $ T_2 $ for every $i= 1,2,...,n.$ Which of the following is/ are necessarily true?   $T_1$ is invertible.   $ T_2$ is invertible.  Both $T_1, T_2$ are invertible.  Neither $ T_1$ nor $ T_2$ is invertible.


"DISPLAY=:0 sudo -u some_user zenity ..." Wayland equivalent

I have a few scripts that need to be started as root and from cron, and need basic user interaction with zenity. To start zenity on user screen, I was used to this form of command:  DIPLAY=:0 sudo -u some_user zenity ...   But if the user is running a Wayland session:   who now shows /dev/tty2 instead of :0 the above command does not work (regardless :0 or /dev/tty2 as DISPLAY value), and returns Error: Can't open display: /dev/tty2   Do you know the "Wayland way" to achieve a similar goal? (Although I am less interested, a MIR equivalent would be an interesting bonus...)  Again, to be clearer, my question is about Wayland user session: I have no problem when user session is running under Xorg. If you still think my question is a duplicate of , please explain why.


Clean install of Windows 10 OEM: license key issues?

I have been a Linux user after switching from Windows 98 and never looked back. However, a friend asked me to set up their brand-new Lenovo ThinkPad with Windows 10. I was totally startled at how terrible the out-of-the-box UX is. Adware all over the place and no luck getting rid of it the gentle way.  So, this question is not about removing adware per se, but about getting a clean install of Windows 10 going. The two things I'm hesitant about are:   Where do I get an ISO image for Windows 10? Where do I find the OEM license key? Back in the day they used to put stickers on the machines.


I am kind of new to C (I have prior Java, C#, and some C++ experience). In C, is it necessary to declare a function prototype or can the code compile without it? Is it good programming practice to do so? Or does it just depend on the compiler? (I am running Ubuntu 9.10 and using the GNU C Compiler, or gcc, under the Code::Blocks IDE)


Valid Canadian Visitor Visa in my old passport with a removed machine readable zone

I want to travel in Canada on November but I renewed my passport. When I renewed my passport, the machine readable zone in my old passport was cut in order to make it useless. Also my visa is intact.  My question is can I travel in Canada with both my passport although my old passport can not be read with a machine? The Old passport should be intact?


Is "therefore" in the right place in this sentence?

I wrote a sentence, and I am confused about the word 'therefore', if 'therefore' in a right place. If this sentence has another error, please point out. Thank you. Here is the sentence:  Some people have talent skills, these people therefore learn some things far faster than others.


I want to display node add form of a particular content type in a pop-up for anonymous users too. There are posts related to displaying a node content in pop-up but not about node add form.   I have a .tpl for a calendar display view. Now when anyone click on a particular div of the table I need to open a pop-up of node add form. So I need to add the <a> anchor tag in the tpl file.   How to achieve this? Is there a way to call the node add form as a pop-up in jquery?


My Dockerfile looks like this:  FROM php:5-apache  RUN docker-php-source extract \     && docker-php-ext-install mysql mysqli pdo pdo_mysql \     && docker-php-source delete   Unfortunately, when I click on a cgi file I see the actual cgi script rather than the HTML file inside the browser:   #!/usr/bin/perl -w print "Content-type: text/html\n\n"; ...    How is it possible to configure cgi?  Thank you in advance,


Does using netfilter.ip_conntrack in the kernel in anyway help mitigate (d)DoS attacks or does it make it worse?  I know it adds the ability to track connections and such but just curious if it helps or just makes the attacks worse by bogging down connections.


find all p prime number such that : sum of divisor $p^{4}$ a perfect square

Problem :   determine all prime numbers such that :   $1+p+p^{2}+p^{3}+p^{4}=m^{2}$ , $m\in \mathbb N$ My try :   $p=2$ so we find : $1+2+4+8+16=31≠m^{2}$   $p=3$ so we find :   $1+3+9+27+81=9^{2}$   $p=5$ so we find :   $1+5+25+125+625≠m^{2}$  $.$ $.$ $.$ so how many numbers ??   if we find :  $m^{2}≤1+p+p^{2}+p^{3}+p^{4}≤(m+1)^{2}$  then we can say no prime number $p>3$   but how I find $m,m+1$ ??


In trial the game was in ENGLISH but by some reason after i have purchased, the game comes "language locked". Why they do this? I've played RPG's in English since my childhood, work with native speakers, played DA:O in English and ... Can`t play the game in English? Why the trial is in English and there are no information about "language lock" on store?  I`ve tried 5 different tutorials to put the game in English, even change the registry HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\BioWare\Dragon Age Inquisition  Locale to en_EN and GDFBinary to GDFBinary_en_EN.dll and nothing works. The translation s***s. The abilities description makes no sense and the use of therms that nobody uses in my home country such as "melindroso" is ridiculous. Looks like a google translation translation of a google translation translation. I wanna play in ENGLISH. I've tried to get a refund since the game is unplayable with this piece of **** translation but the refund """failed""". Thanks for punishing someone who purchased a original copy while people who don't follow the rules and prejudices the game industry can play in any language that they want.  Note that :  1 - The trial was in English 2 - According to ORIGIN store of my region ENGLISH IS A SUPPORTED LANGUAGE    3 - I did not see any advised about language lock 4 - I have tried to enter in contact with origin support. According to the site the waiting time is 5 minutes but in reality... 30 minutes and nobody appears.  EDIT > Is different(not duplicate) because the other questions works for the 2014 game. After the recent updates, the solution isn't working. So i need a solution to 2017 version of the game.    EDIT 2 HOW I managed to put DA:I to English  Since the other solutions works only with older versions, i decided to download old version files then use the another method. Finally works. The unique small problem is that i will be forced to play the tutorial again because


Context: I want to plot some data from a CSV file with pgfplots. This file contains more information than needed, so I want to filter it. Filters (with discard if not from  or ) work well on one column, but I get some troubles when I want to filter on several columns in the same time. Problem: In my case, I want to take the intersection of 3 'discard if not' conditions. But it seems that only the last conditions is taken into account. Here is a following MWE: \documentclass{standalone}   \usepackage{tikz} \usepackage{pgfplots}     \pgfplotsset{compat=newest}      \usepackage{filecontents} \begin{filecontents}{data.csv}     # x, y, color, shape, size     1, 3, a, 0, 2     2, 6, b, 0, 2     3, 5, a, 1, 2     4, 4, b, 1, 3     5, 9, a, 0, 3     6, 1, b, 1, 3 \end{filecontents}   \begin{document}  \pgfplotsset{     discard if not A/.style 2 args={         x filter/.code={             \edef\tempa{\thisrow{#1}}             \edef\tempaa{#2}             \ifx\tempa\tempaa             \else                 \def\pgfmathresult{}             \fi         }     },     discard if not B/.style 2 args={         x filter/.code={             \edef\tempb{\thisrow{#1}}             \edef\tempbb{#2}             \ifx\tempb\tempbb             \else             \def\pgfmathresult{}             \fi         }     }, }  \begin{tikzpicture}      \begin{axis}[grid]                   \addplot+[mark=+, only marks,]             table[x expr=\thisrow{x}*1, y expr=\thisrow{y}*1,                      discard if not A={color}{a},                     discard if not A={shape}{0},                     discard if not B={size}{2},                     ignore chars={\#}, col sep=comma,                 ]              {data.csv};     \end{axis} \end{tikzpicture} \end{document}  In the previous example, instead of plotting only 1 point, I get the 3 points corresponding to size=2. Even though my question seems similar to this , it is not the same since it differs from the combination of one 'discard if' and one 'discard if not' vs three 'discard if not'. But of course, I tried to use this previous question to solve my issue without any success. Question: How to solve this issue, and obtain the intersection of this three discard if not condition with pgfplots?


How can Visual Studio be set to debug a program as soon as that program is launched?

I am debugging an application someone else wrote which runs as a Windows Service unless it is started from the Console and passed parameters.  I would like to start this program from the Console, including some parameters, and then step into the debugger.  I'm not sure how to do this since before I execute the command to start it, there is no process to attach to, and once I execute the command, it's too late to catch it (errors begin almost instantly).  I'm trying to figure out if there's a way in Visual Studio to set up the debugger to attach to a process before it's actually running (or perhaps something effectively similar, given the description of my problem).  I have a breakpoint on the very first line of Program.Main and I'm essentially trying to figure out how I can launch the application from the Command Prompt and then immediately hit my breakpoint.  Is this even possible?  I'm running VS 2013 on Windows Server 2012 Datacenter, by the way.


Formating verbatim (not using listing package)

Considering the following verbatim: \begin{verbatim} aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \end{verbatim}  How to make sure that the verbatim text is not going out of the page, but going on the following line as soon as the width of the page has been passed? Please note that I am looking for a solution without the  package.  EDIT (to describe my problem a bit more) I am having a long report in which I use a lot verbatim. From time to time, the text of the verbatim is going out of the page. Furthermore, I do use the listing package with box for some special programming code. I would like to keep the same verbatim format, but with auto "end of line" for the verbatim code. Is there a simple way for doing it?  EDIT 2 if you take the following verbatim with a very long string : \begin{verbatim} $ mylinuxcommand  !+.++++.....+++-+++-!^!^+............................................;+++-^^!--.........+++--!^!^+.++++.....+++-+++-^!^+............................................;+++-^^!--.........+++--!^!^+.++++.....+++-+++-!^!^+............................................;+++-^^!--.........+++--!^!^ $ myotherlinuxcommand true $ mylastcommand "Thank you for your help" \end{verbatim}  On your pdf, only a part of this string is displayed (It stays on the same line, it's "continuing" out of the page). As on below (pdf dislay) :  $ mylinuxcommand !+.++++.....+++-+++-!^!^+............................................;+++-^^!- $ myotherlinuxcommand true $ mylastcommand "Thank you for your help"  I wish it could go on the next line automatically, so that all the content of this long string is displayed. The displayed result would give, on the pdf (pdf display):  $ mylinuxcommand !+.++++.....+++-+++-!^!^+........................................ ....;+++-^^!--.........+++--!^!^+.++++.....+++-+++-^!^+...... .....................................;+++-^^!--.........+++-- !^!^+.++++.....+++-+++-!^!^+................................. ...........;+++-^^!--.........+++--!^!^ $ myotherlinuxcommand true $ mylastcommand "Thank you for your help"  So that the entire long string from the verbatim is displayed on the pdf. A long string should be automatically cut when it reaches the width of the page, and the rest recursivally displayed on the other line.  Please note that this long string can change, but globally the structure and chars used remain the same.


Ways to prove Euler's formula for $\zeta(2n)$

I recently, out of interest, tried to prove Euler's formula $\zeta{(2n)}=(-1)^{n-1}\frac{(2\pi)^{2n}}{2(2n)!}B_{2n}$ for all $n\in\mathbb{N}$. I adapted  Euler's original proof for $\zeta(2)=\frac{\pi^2}{6}$:  We have the well known formulas $\sin(x)=\sum_{k=0}^{\infty}\frac{(-1)^kx^{2k+1}}{(2k+1)!}$ and $\sin(x)=x\prod_{k=1}^{\infty}\left(1-\frac{x^2}{k^2\pi^2}\right)$. The product formula can be transformed into a series expansion as well but in order to keep it neat, some definitions first:  For the real sequence $\left(a_i\right)_{i\in\mathbb N}$ with $\sum a_i$ convergent, define $$ A_n:=\sum_{i=1}^{\infty} a_i^n $$ $$ \alpha_n:=\sum_{(x_1,\dots,x_n)\in M_n}\prod_{r=1}^{n} a_{x_r} $$ Where $M_n:=\{(x_1,\dots,x_n)\in\mathbb N\space|\space x_1<\dots<x_n\}$. Now we write $c_i=-\frac{1}{i^2\pi^2}$. When we expand the product, we get only odd exponents of $x$ and the coefficient of $x^{2k+1}$ for $k≥1$ is $\gamma_k$. By comparison of the coefficients, we obtain $\gamma_k=\frac{(-1)^k}{(2k+1)!}$. Now, through telescoping, it can be shown algebraically that for every sequence $\left(a_i\right)_{i\in\mathbb N}$ with $\sum a_i$ convergent we have: $$\sum_{i=1}^{n}{(-1)^{n-i}\alpha_{n+1-i}\space A_{i}}=A_{n+1}+(-1)^{n+1}(n+1)\alpha_{n+1}$$ For all $n\in\mathbb N_0$. Since $C_n=\sum_{i=1}^{\infty} \left(-\frac{1}{i^2\pi^2}\right)^n=\frac{(-1)^n}{\pi^{2n}}\zeta{(2n)}$ we have: $$ \sum_{i=1}^{n}{(-1)^{n-i}\gamma_{n+1-i}\space C_{i}}=\sum_{i=1}^{n}{(-1)^{n-i}\frac{(-1)^{n+1-i}}{(2n-2i+3)!}\frac{(-1)^i}{\pi^{2i}}\zeta{(2i)}}=\sum_{i=1}^{n}{(-1)^{i-1}\frac{\zeta{(2i)}}{(2n-2i+3)!\pi^{2i}}}=\frac{(-1)^{n+1}}{\pi^{2n+2}}\zeta{(2n+2)}+(-1)^{n+1}(n+1)\frac{(-1)^{n+1}}{(2n+3)!}=\frac{(-1)^{n+1}}{\pi^{2n+2}}\zeta{(2n+2)}+\frac{(n+1)}{(2n+3)!} \iff \sum_{i=1}^{n+1}{(-1)^{i-1}\frac{\zeta{(2i)}}{(2n-2i+3)!\pi^{2i}}}=\frac{(n+1)}{(2n+3)!} $$ For all $n\in\mathbb N_0$. Now we are ready to prove the formula $\zeta{(2n)}=(-1)^{n-1}\frac{(2\pi)^{2n}}{2(2n)!}B_{2n}$ with induction. With the equation above we can easily verify that it is true for $n=1$; therefore we assume that it holds for all $1≤i≤n$. The assertion $\zeta{(2n+2)}=(-1)^{n}\frac{(2\pi)^{2n+2}}{2(2n+2)!}B_{2n+2}$ is then equivalent to: $$ \sum_{i=1}^{n+1}{(-1)^{i-1}\frac{(-1)^{i-1}\frac{(2\pi)^{2i}}{2(2i)!}B_{2i}}{(2n-2i+3)!\pi^{2i}}}=\frac{(n+1)}{(2n+3)!}\iff \sum_{i=1}^{n+1}{\binom{2n+3}{2i}2^{2i-1}B_{2i}}=n+1\iff \sum_{i=0}^{2n+2} \binom{2n+3}{i}2^iB_i=0 $$ This identity can be proven by comparing the coefficients in the equation $\frac{e^x-1}{x}\frac{2x}{e^{2x}-1}=\frac{2}{e^x+1}$.   Is this proof valid? Nonetheless, if it is, it isn't very elegant. Are there faster ways to prove it?


Which one is more correct in this case? He or They?

What is more correct? "A chef who's not an expert should never cook pufferfish, ______" 1.for he may be deadly poisoned if he does. or 2.for they will be surely poisoned if they do. I know that both "he" and "they" can be used when you don't know the gender of a person. But, if you have to choose between the two of these choices, which one will you choose? I think #2 is more appropriate but "be surely poisoned" sounds weird to me. Like, the grammar sounds so weird Which choice is more correct? Thanks in advance!


In the theory of big-bang  elements were  formed in a particular order. Firstly hydrogen and in last iron formed. But at third no. Lithium was formed which should be present in enormous amount in universe. So where did it go?


Who is the person who says "Rey" in the background of the scene from The Force Awakens where Rey finds Luke's and Anakin's lightsaber?


Creating a chart with two different scalings on the y-axis

I want to create a chart with two different scalings (steps of 500 and steps of 10.000) on the y-axis.  This is needed because there is a fixed cost of 1000 (so a straight line from left to right) and three graphs for different scenarios, which all have rather high values in the end.   Currently this leads to the fixed cost line being extremely small and barely visible, because I have to choose a rather big scale (10.000) in order to get a reasonably sized chart.   However, I want this fixed cost line and especially the points of contact clearly visible.   Imho, to achieve that I need to use two different scales. I came up with a quick and dirty sketch of my desired result in MS Paint:    Is it possible to achieve this with Excel? Appreciate any tips


When do I use "was" and when do I use "were"

Do I use was or were in this sentence?      Bonnie, along with her associates, was invited to the gathering.


This should be the easiest thing to do, but for some reason I just can't get it done.  I'm trying to get a friendly static error page to replace nasty 500 scenarios. For now I'm just trying to replicate a 500 situation on my local machine (Drupal 7 running on MAMP) by throwing in some crap characters on the top of my template.php in my theme, which does trigger a 500 situation, but for some reason the ErrorDocument directive in my .htaccess or Apache config file has no effect.  What I'm doing is quite simply this:  ErrorDocument 500 /500.html   And I have the simplest ever static html-page in the root of my site with the name of 500.html.  Still, when I intentionally break template.php, I get the dreaded White Screen Of Death instead of my nice friendly error page.  What am I doing wrong here? I've done this a billion times in non-Drupal setups but just can't get my head around this one.


What bitness of VC++ Redistributable is expected by 32bit app on 64Bit Windows?

I am installing a 32bit app on 64 bit Windows 7. The app requires VC++2013 Redistributable to be installed and directs me to Microsoft Site.  There are two versions of VC++ 2013 Redistributable 32 & 64 bit. However what I need to know is what is really applicable for a 32 bit app on 64 bit Windows?  Thanks


I have a test module located under site/all/modules/custom. First, I did uninstalled the module, cleared cache. then , I did moved the test module to modules/custom folder which is a new location to put Drupal 8 module.  After that, I have enabled the test module, then Clear All Caches. Now, Drupal 8 keeps says can not find the test module under old location (site/all/modules/custom).  I thought Drupal 8 probably stored path in a DB table, but i am unable to find the table. Can any one tell a solution about How to fix above problem?


Can the same Pokemon have a different max CP in Pokemon Go?

For instance if me and my friend had a Pidgeot and we powered them all the way up. Could mine end up with like 525 and his at like 500?


minna@minna-System-Product-Name:~$ sudo apt-get updates [sudo] password for minna:  E: Invalid operation updates minna@minna-System-Product-Name:~$ sudo apt-get install updates Reading package lists... Done Building dependency tree        Reading state information... Done E: Unable to locate package updates minna@minna-System-Product-Name:~$     this is the message i got when I tried in terminal. earlier I updated from soft ware updator I get the message the upgrade needs a total of 77.7MB free space on disk'/boot' Please free atleast an additional 4.970k of disk space on'/boot'.Empty your thrash and remove temporary packages of former installations using sudo apt-get clean.this was the message .when I do that in terminal it shows that no such commands found.Then what can I do to update my system?


I really don't want to have to re-install all apps and sign into them after I upgrade firmware. Is there a way to back them up? Any tips that may ease the process are appreciated (I have my photos/videos backed up through google and a lot of apps do sync after I sign into them). The main problem is typing in all the passwords for the various apps is going to be a pain.  Is there a way I can export a list of all the installed apps and automatically download them again?


Prove this equality by using Newton's Binomial Theorem

Let $ n \ge 1 $ be an integer. Use newton's Binomial Theorem to argue that  $$36^n -26^n = \sum_{k=1}^{n}\binom{n}{k}10^k\cdot26^{n-k}$$  I do not know how to make the LHS = RHS. I have tried $(36^n-26^n) = 10^n $ which is $x$ in the RHS, but I don't know what to do with the $26^{n-k}$ after I have gotten rid of the $26^n$ on the right. I also know I might have to use $\binom{n}{k} = \binom{n-1}{k-1} + \binom{n-1}{k}$ pascal's identity in this question.  Maybe I am approaching it from a completely wrong point of view, If someone can help point me in the right direction. It would be much appreciated!!!


Search across Stack Exchange sites in Android app

Is it possible to search for a question across all Stack Exchange sites in the Android app?   Right now I can search in only one specific site at a time.   If not, can you add that feature?


Infinite number of rationals between any two reals.

Let $a$ and $b$ be reals with $a<b$. Show that there are infinitely many rationals $x$ such that $a<x<b$.  My plan of action was to assume that $x$ is the smallest such rational and find another rational in the interval $(a, x)$, but I am struggling to make it work. A hint will be much preferred to a full solution.


Splitting disconnected vertices in different objects

I know I can use Ctrl+L to select vertices connected to a given one than P to separate selected vertices and move them in another object (as explained  for example).  But, is there a shortcut to do this automagically when there is like one hundred sub objects that I would like to separate ?


Installing latest QGIS version on Ubuntu?

I am relatively new to Linux, so can you indicate the exact commands (step-by-step) that I need to type to get the latest QGIS installed on Ubuntu 14.04.  I have tried to follow the instructions provided here  but I haven't managed to install anything.  Can someone explain to me step by step process of doing it. Right from adding the QGIS repository on the sources list.  I have Ubuntu 14.04.1 LTS installed on a 32-bit Dell Latitude E4310 Machine


How do I make an integral symbol larger in in-line math mode?

I have the following formula in my LaTeX code:  $ \mu_{x_{t}} = E(x_{t}) = \int_{a}^{b} $   This gives me the follwing in my document    Now I tried to use \bigint, but that gives me too thick integral... what do I need to do to get the same thickness but with more height?


Acknowledging a reviewer from a journal from which the paper was rejected

My paper was rejected from a journal. However, remarks of one of the reviewers were useful, and I incorporated them into the next version of the paper.  Is there a general pattern of acknowledging such contribution (in the Acknowledgement section)?  Or should I leave it, not to advertise information that the paper was rejected from a particular journal?  (As a side note, this paper was rejected two times, each time with one positive review, and one of type "OK, but I think it is not of general interest".)  EDIT:  In my case (as in general in my field) reviewers were anonymous. (Otherwise I would just use their names.)   And in my case the helpful comments were in positive reviews (but I doubt whether it changes anything).


How to install suggested packages in apt-get

I know the question has been asked before, but please hear me out. So I wanted to install screenlets. I ran sudo apt-get install screenlets, and this is what I got:  The following extra packages will be installed:   libart-2.0-2 libbonobo2-0 libbonobo2-common libbonoboui2-0 libbonoboui2-common libgnome2-0 libgnomecanvas2-0   libgnomecanvas2-common libgnomeui-0 libgnomeui-common libtidy-0.99-0 python-beautifulsoup python-evolution   python-feedparser python-gmenu python-gnome2 python-numpy python-pyorbit python-rsvg python-tz python-utidylib   screenlets-pack-basic Suggested packages:   libbonobo2-bin python-gnome2-doc python-numpy-doc python-numpy-dbg python-nose python-dev gfortran   python-pyorbit-dbg screenlets-pack-all python-dcop Recommended packages:   python-numeric python-gnome2-extras The following NEW packages will be installed:   libart-2.0-2 libbonobo2-0 libbonobo2-common libbonoboui2-0 libbonoboui2-common libgnome2-0 libgnomecanvas2-0   libgnomecanvas2-common libgnomeui-0 libgnomeui-common libtidy-0.99-0 python-beautifulsoup python-evolution   python-feedparser python-gmenu python-gnome2 python-numpy python-pyorbit python-rsvg python-tz python-utidylib   screenlets screenlets-pack-basic 0 upgraded, 23 newly installed, 0 to remove and 2 not upgraded.   People say that Recommended packages are installed by default, but they are clearly not included in the NEW packages that will be installed above. I also decided to include the Suggested packages in the installation, so I ran sudo apt-get --install-suggests install screenlets instead, but I got a HUGE list of NEW packages that will be installed; that number is precisely 0 upgraded, 944 newly installed, 0 to remove and 2 not upgraded. Should'nt I be getting only around 10 extra packages?


Let R and S be rings . Consider K an ideal in RS. Show that there exist an ideal I in R and J in S such that K=IJ . How can I proceed this ?


I'm trying to add list items with links and when i'm trying to remove them nothing happens. But if i create the li items in my HTML they do get removed..  My append code-  fileInput.append('
' + fileurl + '
');   My remove code-  jQuery('li a').click(function() {     jQuery(this).parent('li').remove(); });   When i use the same append code as static HTML, i can remove it without a problem. But when i add these lines using append nothing happens. How can i fix this please? :)


how to see what went wrong ("There was a problem.. report it)

How do I know what went wrong when "There was a problem.. report" box comes up every time I boot.  How to stop the repeats after I "report" this?


Why can't I access the current execution context with a callback?

I've been studying closures and callbacks, for the last hours, and I wrote this function to better understand the concepts of closures. I know that in this example, closure is not happening because callback is called inside the same execution context as function one().   function one(callback) {    let a = 1;    let b = 2;     callback() }   one(function () {    console.log(a); }); // Uncaught ReferenceError: a is not defined   Even though the callback is executed in the same execution context as function one(), why can't I access a with the callback?  Is it because let being scope limited and therefore the callback cant access it once it reaches to it's execution? Shouldn't the callback go down the scope chain and find a?   Thank you


Why does a free-falling body experience no force despite accelerating?

Note: For the purposes of my question, when I refer to free fall assume it takes place in a vacuum.   From my (admittedly weak) understanding of the equivalence principle, falling in a gravitational field is physically indistinguishable from floating in interstellar space. This would make sense to me if gravity simply caused an object to move at a constant velocity. Moving at a constant speed, or floating in space, are just two different ways of describing an inertial frame, and are fundamentally no different. But free falling in a gravitational field means accelerating continuously, and doesn't an accelerating body experience a force? Then isn't free falling fundamentally different from floating in space?


I'm in a mechanical physics class, and I'm having a hard time understanding what the quantity of work represents. How can I understand it conceptually?


How do I format a big disk (4TB) for use in both macOS and a Raspberry Pi?

I need to setup a big hard disk (4TB) so that I'll be able to use it in both macOS and in a Raspberry Pi.  Up to now all my attempts failed - at the moment I have formatted it so that it uses GPT, type "linux filesystem", and all the 4TB are recognized - linux recognizes it but not the Mac  The solution proposed in  does not work since it suggests the MSDOS type, which doesn't work for big disks.  Is there a recommended way to solve this?


I want to ask why does a person feel weightless during free fall? Please give a specific  and clear answer, without making it complex.


Assume a client app that allows OAUTH login (client flow), such that upon login I can access REST, Tooling, Metadata APIs (etc.)  I can get simple org info (id, urls) via an identity call, and I can get the org name by querying the Organization sObject.  There are some Tooling API objects (SandboxInfo, SandboxProcess) related to sandbox creation, but the exist only in the prod org.  How can I get the sandbox name, assuming I'm logged in and can call any API?  I've seen a number of questions about getting the Sandbox name via Apex (and none with simple answers), but I'm wondering if any of the APIs provide better options.  I do not want to rely on hacks such as parsing user names.  Note: As noted above, I am not constrained by running in Apex.  I am looking for an API based solution.  This is not a duplicate of any of the several 'how do I get sandbox name in Apex' questions on the site.


Deleting and undeleting an answer causes an "answered" post to change to "modified" while still pointing to the answer that wasn't modified

In short, if the last action on the post is someone posting an answer, it shows "answered [x] minutes ago PosterName". However, deleting and undeleting a different answer (posted earlier) causes it to switch to "modified [x] minutes ago PosterName", even though post deletion and undeletion do not cause bumping. The last action on the post was answering, so it should continue to show as "answered".  For example, I tested this out in the sandbox:  Answer is posted:        30 seconds later, another answer is deleted (and optionally undeleted; or vice versa probably), changing the label but not bumping it:        The behavior that it should be is:    Find the last active post   If the last active post is deleted it should say "modified" If the last active post is not deleted and not edited it should say "answered" If the last active post was edited, it should say "modified". No duh.      Here's my original bug report, which you can probably just skip unless you need another example:  I just posted an answer to a question, then left the page without doing anything else. But it says the last action on the page is me modifying something, with the  (which shows the last activity) redirecting to , as shown below on the  (it's at the top of the list):    (The , under Questions, also shows this problem.)  I didn't modify the answer after posting (not even during the grace period) nor did I do something else that would cause a "modified" bump (protection, close/reopen votes, add bounty, messing with deletion). There were no deleted answers when this happened. I'm not sure if the problem is related to the question having a bounty on it (by the OP, who is deleted).  None of the other activity on the active page shows this problem. (The "modified 10 minutes ago" on the second question is an edit to an answer.)    Since I first posted this question, another user (named ) posted an answer to the exact same question. For some time the listing read "answered X minutes ago", but now it says "modified X minutes ago" even though it points to the same, unedited answer. However, I noticed that there is now a deleted answer which was last edited before 1006a's answer was posted, but was deleted after it was posted. Now I'm wondering if it has anything to do with deletion.


How do I find out which program and process ID accesses a given IP address in Windows?

Is it possible to catch, which program is accessing a specific IP address?   I found my computer is flooding and wish to check addresses one by one.  May be it is possible to set up some audit for this?


Creating a Black Hole Folder ('Hawking Dimensional') Variant in Linux (Slackware)?

I would like to create a folder that any user can add a file/folder to (if it is not a duplicate) but only root can access... Or could be read by the user but only changed by root.. It is a simple idea in concept anyway...


Why wouldn't an upvote change my total score?

I noticed yesterday an answer I had given was upvoted, however, I also see that my total points never changed for that answer.  Why is that?    Sometimes I see a lag in getting the points assigned, but it's been over a day now and it's still not showing up.  Is this a bug?


I cant install i-nex for the following reason:  The following packages have unmet dependencies:  i-nex : Depends: gambas3-runtime (>= 3.5.0) but it is not going to be installed          Depends: gambas3-gb-image (>= 3.5.0) but it is not going to be installed          Depends: gambas3-gb-qt4 (>= 3.5.0) but it is not going to be installed          Depends: gambas3-gb-form (>= 3.5.0) but it is not going to be installed          Depends: gambas3-gb-desktop (>= 3.5.0) but it is not going to be installed E: Unable to correct problems, you have held broken packages.


I have an Object (aObject) contains datetime field, I want to get all data from aObject where datetime includes 12-29-2013 ignoring the time.  any idea ?


I installed Windows Server 2012 R2 Standard Evaluation Version on an IBM x3650 M4 server.  Also I connected a domain controller configured as a secondary server. Now I've purchased a Volume License Key, but when I am activating with the key I am getting an error: "That key can't be used to activate this edition of Windows."


I was trying to split a String into a String array using the split function but received the error:  Exception in thread "main" java.lang.NullPointerException at wdtbam.main(Main.java:16)   I was solving this problem at . My goal was to split the String into indexes of an array wherever a space was encountered and later parse that into Long type.  Here's my code  import java.util.*; import java.io.*; class wdtbam {     public static void main(String args[]) throws IOException     {         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));         Scanner sc = new Scanner(br);         int t =sc.nextInt();         for(int i=1;i<=t;i++)         {             int n =sc.nextInt();             String a =br.readLine();             String b =br.readLine();             String c = br.readLine();             String cx[]= c.split(" ");  //the problem             long d []=new long[1234];             int y=0;             for(int j=0;j<=n;j++)             {                 d[j]=Long.parseLong(cx[j]);             }             for(int k=0;k<n;k++)             {                 if(a.charAt(k)==b.charAt(k))                 {                     y++;                 }             }             System.out.println(d[y]);         }     } }   I have been encountering this problem since long and it would be very appcreciable if someone could help me out.  EDIT:  I removed BufferedReader from my code and instead used only Scanner. I also tried to directly input the numbers into an array instead of inputing a string and later parsing it to an long array.   Here's my new code:  import java.util.*; import java.io.*; class wdtbam {     public static void main(String args[])     {         Scanner sc = new Scanner(System.in);         int t =sc.nextInt();         for(int i=1;i<=t;i++)         {             int n =sc.nextInt();             String a =sc.nextLine();             String b =sc.nextLine();             long d []=new long[1234];             int y=0;             for(int j=0;j<=n;j++)             {                 d[j]=sc.nextInt();             }             for(int k=0;k<n;k++)             {                 if(a.charAt(k)==b.charAt(k))                 {                     y++;                 }             }             System.out.println(d[y]);         }     } }   I am still getting an error. IDK why.  Please help I am really frustrated with JAVA right now.  Error:  Exception in thread "main" java.util.InputMismatchException     at java.util.Scanner.throwFor(Scanner.java:864)     at java.util.Scanner.next(Scanner.java:1485)     at java.util.Scanner.nextInt(Scanner.java:2117)     at java.util.Scanner.nextInt(Scanner.java:2076)     at wdtbam.main(Main.java:18)   BTW here's the problem I was trying to solve :


I'm working on a set of graphs that contain circles drawn at various locations. I'm using the circle command to draw the circles on the graphs, but I'm not able to set the circle radii such that they match the axes scales. That is to say, a circle with a radius of 1 does not have a radius of 1 with respect to the x or y axes.  To figure out my problem, I turned to the manual. Unfortunately I cannot even reproduce the basic circle plot shown in the manual. The code below taken directly from the manual (I had to add the document class) produces what looks like an ellipsis and not the circle shown in the manual.  % MWE from manual (Revision 1.16, page 355) \pgfplotsset{width=7cm,compat=1.16} \documentclass{article} \usepackage{pgfplots}  \pgfplotsset{width=7cm,compat=1.16} \begin{document} \begin{tikzpicture} \begin{axis}[tiny,enlargelimits,    axis equal,    xmin=-1,xmax=1,    ymin=-1,ymax=1,    xtick={-1,0,1},    ytick={-1,0,1},    grid=major, ]    \draw [blue] (0,0) circle [radius=1]; \end{axis} \end{tikzpicture} \end{document}     One of the other answers here said the proper syntax should have a radius with a unit. Adding cm to the radius parameter as shown below produces a circle at the origin with a radius that goes beyond the x=1 plane.     \draw [blue] (0,0) circle [radius=1cm];     Here is what I'm trying to reproduce from the Revision 1.16 manual. I am compiling using lualatex with MikTex 2.9 on Windows 10. Any thoughts on how I could reproduce the circle as shown in the manual would be appreciated.


I am trying to get a "where in" to work using a parameter in sql.  SELECT * FROM tablename WHERE(name IN (@names))   So I execute the SQL in sqlmanager, and enters 'Name1', 'Name2' in @name value, when i get asked for it. This way, query returns 0 rows. But if i change the SQL to:  SELECT * FROM tablename WHERE(name IN ('Name1','Name2'))   It works.  What is the trick to make it work?  This post solved it for me:  Thanks for all the responses :)


is there any chance to bypass google pixel FRP for februrary security patch level ? any signs ?


How to transform one PDF into another graphically?

To understand what I mean, let's use two well-known distributions: the normal and lognormal ones.  From the dataset point of view, if you take normally-distributed data and take their exponential, you get lognormally-distributed data (norm -exp-> lognorm).  So the "idea" was: why not using the PDF directy and transform the normal PDF to the lognormal one by taking the exponential of its x-axis. The reasoning was that this x-axis represents my data: taking the exponential of these data or the exponential of the x-axis of the corresponding PDF should do the same.  But I did not even bother to do it: mathematically, this is not how one can transform the normal PDF to the lognormal one!  What I don't understand is why just taking the exponential of the x-axis of the PDF does not work. I mean, not mathematically (I get that there is a $1/x$ in the lognormal PDF!), but what is conceptually wrong with "just stretching" the axis?


Regarding p-values, why 1% and 5%? Why not 6% or 10%?

Regarding s, I am wondering why $1$% and $5$% seem to be the gold standard for "statistical significance". Why not other values, like $6$% or $10$%?  Is there a fundamental mathematical reason for this, or is this just a widely held convention?


When two photons annihilate each other through destructive interference, where does the energy go?  Perhaps this is only answered by ‘wave type’ questions and answers? Does the conservation of energy get violated?


In Looper, it is established that permanent physical harm to a young looper will instantaneously affect the old version of the same looper. For example, a looper can send a message to his older self by permanently carving it in his arm.  I assume Abe and his gang know about this. Why is it, then, that in Seth's case:      when the killers capture young Seth, they torture and mutilate him in order to force old Seth to come to them, then end shooting him up? Wouldn't simply killing young Seth get rid of both Seths? Is the torture simply sadism?   We know the above will happen, since something similar happens later in the movie. And if Joe, who is definitely not the sharpest tool in the shed, can figure it out, surely Abe must also know it?


Four different positive integers a, b, c, and d are such that $a^2 + b^2 = c^2 + d^2$

Four different positive integers $a, b, c$, and $d$ are such that $a^2 + b^2 = c^2 + d^2$ What is the smallest possible value of $abcd$?  I just need a few hints, nothing else. How should I begin?  Number theory?


Windows batch file not running when I double click, how do I restore the association with cmd.exe?

Windows 8 64-bit. The user I'm logged in as has admin rights. When I open a cmd windows the window title even says "Administrator: cmd.exe".  So, I set my .bat file association to have the .bat file opened in Notepad++, and now I can't set it back to run the bat file when I double click on it. I've tried several web pages which told me to edit the registry to no avail.   When I do try to merge a .reg file into my PC, I get an error "You do not have permissions" or something. My user is not "administrator" but my user "chuck" does have admin rights. It always has.    I tried , the .reg file merged without error this time, but when I double click on a .bat file it still opens in Notepad++. I downloaded the file to change the .bat file assoc only. Do I have to restart the PC?  I also tried making the registry edits here: . It didn't work either.  The .bat file extension cannot be changed in the Associate File Extension with a Program in the Control panel. When I try to associate cmd.exe with a .bat file I get an error like "You cannot associate that program with this file." I found  but there is no .bat file entry under FileExts. Also on this link I have no no UserChoice key to delete for HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.bat\UserChoice.  Rebooted PC, I still have the same problem. I will make sure Notepad++ is not restoring associations with itself each time it runs. EDIT: As far as NPP preferences are concerned, it does not register .bat files.    Any more ideas? I have been dealing with this for 3 months off and on now.   NOTE: Some fixes for this problem work on Windows 7 but DO NOT work on Windows 8.     UPDATE: Fixed it. I had to    Make a shortcut to regedt32.exe on my desktop.   Right click shortcut and do "Run As Administrator", even though my user has admin rights.  Search the whole registry for the string "notepad" whereon I found the sneaky little thing here: HKEY_CURRENT_USER\Software\Microsoft\Windows\\**Roaming**\OpenWith\FileExts\\.bat and deleted the UserChoice item.  Reboot windows.


I would like to create an alias to rm command in order to have a confirmation message after executing this command. So I am creating an alias like this alias rm='rm -i'. But as far as I know this is a temporary alias and it lives until you close the terminal.  As it is explained  to save alias permanently I need to execute ~/.bash_aliases or ~/.bashrc commands in terminal and add my alias there. But when I execute ~/.bashrc I get following error message :  bash: /home/bakhtiyor/.bashrc: Permission denied   When I run ~/.bash_aliases I get another error message like this:  bash: /home/bakhtiyor/.bash_aliases: File or directory doesn't exist.   What is the actual problem and how can I solve it?


Converting list of strings to list of numbers without specifying int or float

What is the easiest way to convert a list of strings to a list of numbers so that those that look like integers converts to int and others to float?   Example:  list = ['1' , '2.2' , '3']   One way to convert is to define are they ints or floats:  list = [float(item) for item in list]   But in this example also obvious int would be converted to float as well.  One way could be to check variable type and convert case by case. Is there an easier way?    Edit:  A similar looking question  is a little hard to understand what the questions is, and accepted answer does not cover my case.  Another similar looking question  is a basic question of how to convert to int or float and my question went a little further than that.  I'll ask again in other words: How to convert a string (or list of strings) to just to a number (or list of numbers), whatever type, retain its type whether int, float (or complex). Usually conversion is made from string to a certain type of number, usually to int or float. Is there an easy and obvious way to convert a string to a number of any kind?


I have a mail server which has a domain pointer with a .ca and .com (ie. mail.example.com and mail.example.ca).  Is it possible to have an SSL certificate for each for that mail server?  I am running Qmail with an Apache Web server front.  I tried to put the SSL pointer for the secondary extension in it, but that did not work.  So, currently it is only running for the .com extension (for SSL).


Filling tableadapter with stored procedure takes signifigantly longer than running stored procedure in SQL

I have been trying to fill my ultracombo box with data yet it takes a signifigant amount of time. However when I run the same stored procedure from withing sql server it takes relatively no time. The line of code that the program gets hung up on is:  SprocPatientsTableAdapter.Fill(Me.PatientsDataSet.sprocPatients, SelectedCustomerID)   By signifigant differnce of time I mean the difference of less than 5 seconds in sql server and more than three hours from within the program.


Reject host(not ip) using firewalld / firewalld.richlanguage

Is it possible to add a rule in linux firewalld to reject an entire host(not ip or ip range) ?  For example, I wish to reject all connection coming from my133y.org.  Using firewall rich language I can drop ip, but host rejection is not provided in man pages.  Example to reject ip  firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.100.4/24" drop'   when modified to :  firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="my133t.org" drop'   I got the error:  Error: INVALID_ADDR: my133t.org


I'm trying to draw a boundary around a convex set of circular nodes in TikZ. The aim is to have it padded by 1cm, with an arc at the corners between segments, like this:    I currently have the following code:  \documentclass{article} \usepackage{tikz} \usetikzlibrary{calc}  \begin{document} \begin{tikzpicture}[every node/.style={circle,draw=blue}]    \node at (0,0) (a) {};   \node at (1,3) (b) {};   \node at (2,2) (c) {};    \draw[red]   ($(a)!1cm!-90:(c)$)   let \p1 = ($(a)!1cm!-90:(c) - (a)$),     \n1 = {atan2(\x1,\y1)},     \p2 = ($(a)!1cm!90:(b) - (a)$),     \n2 = {atan2(\x2,\y2)},     \n{delta} = {-Mod(\n1-\n2,360)}   in      arc [start angle=\n1, delta angle=\n{delta}, radius=1cm]   --   ($(b)!1cm!-90:(a)$)   let \p1 = ($(b)!1cm!-90:(a) - (b)$),     \n1 = {atan2(\x1,\y1)},     \p2 = ($(b)!1cm!90:(c) - (b)$),     \n2 = {atan2(\x2,\y2)},     \n{delta} = {-Mod(\n1-\n2,360)}   in      arc [start angle=\n1, delta angle=\n{delta}, radius=1cm]   --   ($(c)!1cm!-90:(b)$)   let \p1 = ($(c)!1cm!-90:(b) - (c)$),     \n1 = {atan2(\x1,\y1)},     \p2 = ($(c)!1cm!90:(a) - (c)$),     \n2 = {atan2(\x2,\y2)},     \n{delta} = {-Mod(\n1-\n2,360)}   in      arc [start angle=\n1, delta angle=\n{delta}, radius=1cm]   -- cycle;  \end{tikzpicture} \end{document}   I'm going to have to draw a lot of these, so it would useful if I could replace the \draw statement by something like:  \draw[red] \convexpath{(a) (b) (c)}{1cm};   where (a) (b) (c) are the nodes in the corners of the convex set in a clockwise direction. In the case of one node I would like it to draw a circle of the specified radius around the node in question.  Does anyone have any suggestions for how to go about writing such a macro?


Best SE site for image processing questions?

Which SE site is on topic for image processing questions?   Since I have seen some questions posted on  and also on Stack Overflow are closed as off topic.


Minimize multi-variable function one variable at a time

I am wondering if I can minimize a multi-variable function one variable at a time. In other words, is it true that:  $min_{x_1,x_2} f(x_1,x_2)=min_{x_1} min_{x_2} f(x_1,x_2)$


Extra space in Theorems', Lemmas', etc. title

I am using the following command to include a title (e.g. a citation) as the title of my lemma,  \begin{lemma}[\cite{Mieghem11}]      This is my lemma ...   \end{lemma}   but I'm getting an extra space there,    I'm using amsthm package with IEEEtran.cls  \documentclass[10pt, twocolumn, twoside, journal]{IEEEtran} \usepackage{amsmath, amsfonts, amssymb, color, enumerate, amsthm, graphicx} \usepackage{tikz, subcaption, cite} \usepackage{color, xcolor, soul, bm} \PassOptionsToPackage{hyphens}{url}\usepackage{hyperref} \newtheorem{lemma}{Lemma} \begin{document}     \begin{lemma}[\cite{Mieghem11}]\label{lem: max singular}         This is my lemma ...     \end{lemma} \end{document}   This also happens for definitions,


When viewing an image in zoomed mode, the up-down arrow keys do not allow me to pan in it. I have not found any other shortcuts to pan without using the mouse.


Enhance the review mechanism on mobile app

Currently it is quiet cumbersome to come to do reviewing on the mobile app. IMHO especially reviewing is something people could / would do in every free minutes they have e.g. due the meeting or waiting time on the doctor. By putting a link or icon prominently on the entry site, it would enhance the reviewing activity.


shut shown a business's website, remove from seach

A business with two partners and a website have parted ways. The website is now just a single static page with contact info for the partners. Searches for these partners still returns this website, before other more relevant results from their new business ventures. Redirects are not a good idea because of the split.  What is the best way to remove the old site from the internet? The question was asked of me in a Google-specific context, but a more general answer would be helpful.


Python Extract number string from a string and convert it into corresponding numeric value

input_string = "Tomato 2 kg, three kg Onion, eleven pieces lemons"  output_string = "Tomato 2 kg, 3 kg Onion, 11 pieces lemons"


I am sorry but I really not an expert with with LaTeX.   I know that there are several posts about it, I tried to follow many of them but I still have no results. I have Windows OS and I am using TeXworks, compiling with command pdflatex+makeindex+bibtex. I want to use the hieeetr style for the bibliography, but I do not know where to save the .bst file. Any help?


Preview doesn't show the content of text file with a certain extension (`.jl`) in Finder

When looking for a script of a programm (.py for Python, .m for Matlab, .jl Julia or .txt in general) it is very handy to go in the finder a simply highlight that script file ==> then a preview of that script appears on the right side in Finder. However, for the Julia script file .jl there is no such preview ==> nothin appear on the right side although it is a normal text file, the proof is that when I change the extension to .txt, the preview is available. How do I do to have that preview available


We have known for quite some time now that light travels at a finite speed of 3x10^8m/s (approx) through vacuum. But why is that? Why can't the speed be infinite? Or at least higher than the current value? What is limiting its speed? I mean, the speed of sound is limited by the density of the medium. Then, what limits the speed of light in vacuum? Does finiteness of speed of light mean the possibility of existence of a omnipresent medium like aether, which, may be is intangible (or doesn't interact with the particles we know of currently)?    I do know that light is propagated by photons. That only makes me more curious as to why the speed is fixed to the current value? Especially as to WHAT is limiting the speed of a particle with no inertia?


ntoskrnl.exe!IoGetStackLimits+0x3060  when pc is idle for app 4 minutes, process starts taking app 25 % (one core) of CPU.   I have driver talent for update, I tried several windows 10 healing opetions.. but still remains. Malware scanned as well..


Are GNOME Shell extensions compatible with Unity?

Today I saw an article about extensions for GNOME Shell, so it got me thinking a couple of questions that may apply to many users in Unity:   Will the GNOME Shell extensions be compatible with Unity? Can I install them directly to Unity from the  website? In case 2 is NO, is there a similar idea for Unity in the works?


How to prove $$\left|\frac{a-b}{1-\bar{a}b}\right|<1,$$  where $a,b$ are complex numbers, $\bar{a}$ is the complex conjugate of $a$, and $|a|,|b|<1$.


How do researchers from different institutions get to know each other to begin a collaboration?

Quite often, graduate level research is done by researchers from different institutions, whether different universities or cooperation between a university and a private corporation.   How do the researchers get to know each other? How does the collaboration begin?


What make and model is this MTB with no decal (pictured)?

My second hand MTB frame has no decal on it. To me it looks like a downhill frame. I was told it's an Orange but now that I look at it I don't know how to tell. The serial number is JSG0111.


Can I convert flat bar to drop bars on a hybrid bike

I'm fairly certain that the bars should change out quite easily; I'm more concerned about the shifters and brakes. Currently I have a hybrid 18 speed with cable disc brakes and Shimano Deore XT derailer. I know that these are typically mountain bike parts. I'm eyeing up the Shimano 105 STI dual control shifter/brake. Is this even going to work?   My main reason for wanting the change is after riding the road for quite a few years with flat bars my wrist are starting to take a bit of a beating. I put some bar end on the flat bars to change my grip position, which helped my wrists, but now I feel my grip is too wide.   If pictures would help i can try to upload some tonight, any advice would help.


Display file names from gitlab on a remote website

Is it possible do display the file name of a specific file inside a git repo on a remote website only using JS?


Reinstall Windows 8 on a Windows 8 based system with embedded key

I'm a computer technician and we started selling few Windows 8 machine. We saw the new COA label does not show the key and after reading a little bit online, realized those systems came with the key emmebeded in the eUFI BIOS.   My question is : How do I reinstall Windows 8 if the hard drive is crashed? I kind of get that you can install it with a media and the media should activate the licence embedded. What is the media required? Is a retail DVD is able to do the work or do I need a system builder kit? I understand the manufacturer is reponsible to provide media  or replace the failed drive under the warranty but what will happen when warranty expire? I'll have to sell a full windows 8 licence with a key?  Thanks


Why do newline characters get lost when using command substitution?

I have a text file named links.txt which looks like this  link1 link2 link3   I want to loop through this file line by line and perform an operation on every line. I know I can do this using while loop but since I am learning, I thought to use a for loop. I actually used command substitution like this   a=$(cat links.txt)   Then used the loop like this  for i in $a; do ###something###;done   Also I can do something like this  for i in $(cat links.txt); do ###something###; done   Now my question is when I substituted the cat command output in a variable a, the new line characters between link1 link2 and link3 are removed and is replaced by spaces  echo $a   outputs  link1 link2 link3  and then I used the for loop. Is it always that a new line is replaced by space when we do a command substitution??  Regards


why "null" object cant be assigned through method

I assigned a variable map to null:  public static void main(String[] args){     Map map = null;     createMap(map);     System.out.println("map is:" + map); }  and I pass the variable map to the method createMap and re-assigned it:  public static void createMap(Map map){     if(map == null){         map = new HashMap();         map.put("key", "value");     } }    And the Variable map still is "null", could someone tell me why?


Make an Ubuntu bootable USB drive for a PC using Mac?

I have a netbook that I want to install Ubuntu onto. I do have a good Mac computer that I can make a bootable USB drive from, but I'm confused on how to go about making it.


Why isn't $\mathbb{C}[x,y,z]/(xz-y)$ a flat $\mathbb{C}[x,y]$-module

Why isn't $M = \mathbb{C}[x,y,z]/(xz-y)$ a flat $R = \mathbb{C}[x,y]$-module?   The reason given on the book is "the surface defined by $y-xz$ doesn't lie flat on the $(x,y)$-plane". But I don't understand why this can be a reason.  Since     An $R$-module $M$ is flat if and only if for any ideal $S$ of $R$, the map $1_M \otimes i: M \otimes_RS \rightarrow M \otimes_RR$ is injective. Here, $i: S \rightarrow R$ is the inclusion map.   I tried to find an ideal $S$ in $R$ such that $M \otimes_RS \rightarrow M \otimes_RR = M$ is not injective, but I didn't succeed. Please give me some help. Thank you.


Configuring Approval page layout for user-selectable rejection reason

can we add a pick-list field to the Approval pagelayout ??  My requirement is i want Approvers to enter Reason for rejecting a record.  I have a picklist field on my object with the rejection reasons , i want this field to be placed on the approval page layout so that Approvers select reason from this pick-list.  Thanks in Advance.


What is the device Barry (The Flash) has on his chest in the Supergirl crossover?

I watched the crossover between Supergirl and The Flash and as probably all of you also did, noticed a device we hadn't really seen before on Barry's chest.  I can only assume it has something to do with the blueprints he got from Wells but we haven't seen that thing before.  Was The Flash in Supergirl a future version of The Flash or is it just because both series don't run simultaneously?  And the main question is what that device does for him? Anyone who knows this through any other sources? Comics, etc..


How to prove that $\alpha\beta =\beta\alpha$ if $\alpha$ and $\beta $ are disjoint permutations of $S_n$ symmetric group of $n$ elements. Two permutations are said to be disjoint if every elment moved by one is fixed by another permutation.  My attempt : Let any $x \in [n]$,    if $\beta$ fixes element $x$, $\alpha\beta(x)$ it will be $\alpha(x)$ let's say $\alpha(x) = y \in  [n]$, now we need to show that $\beta\alpha(x)$ is equal to $y$, $\beta(y)$ will be $y$ as $y$ will be moved by $\alpha$.   Is there better way to prove this? I will go by case by case.


How to recursively download a folder via FTP on Linux

I'm trying to ftp a folder using the command line ftp client, but so far I've only been able to use 'get' to get individual files.


Is $[0,1]$ a countable disjoint union of closed sets?

Can you express $[0,1]$ as a countable disjoint union of closed sets, other than the trivial way of doing this?


Elegant Proof of the Product of Two Levi Cevita Tensors

Is their an elegant way to prove the product of two Levi Cevita tensors is equivalent to a determinant of a matrix of Kronecker deltas? I know that the anti-symmetry and cyclic nature should be easily proved via determinant row-interchange laws, but is the proof inelegant when it comes to showing it zeroes out when two indices are repeated?  The property in mind is: $$\epsilon_{ijk}\epsilon_{lmn}=\det\left|    \begin{array}{cccc}       \delta_{il}   & \delta_{im}  & \delta_{in}   \\       \delta_{jl}   & \delta_{jm}  & \delta_{jn}   \\       \delta_{kl}   & \delta_{km}  & \delta_{kn}       \end{array} \right| $$


How to add a halo to a text in the composer?

I would like to add texts with halo, in the composer (not in the map). Do you know a way to do it?  I'm using QGIS 2.0.1


I want to load a path to picture from config file in order to show different pictures on different webapps.  Here I have  <add key="logoFileName" value="~/images/logo.png" />   And I want to use it like  <img src="@System.Configuration.ConfigurationManager.AppSettings["logoFileName"]" height="65" />   But .net only show "~/images/logo.png", wich must be interpreted by .net as well.  How to perform this in order to see the logo?


$f$ is real valued function on $[0,\infty)$ such that $f''(x)>0$ for all $x$ and $f(0)=0$  Then $h(x)={f(x)\over x}$ is decreasing or increasing or both over $[0,\infty)$  $h'(x)={xf'(x)-f(x)\over x^2}$  What I can conclude from here?


Auto turn off switch during power outage

In my area power outages are a daily routine. And power surges, which occur when the electricity comes back, makes it even worse. To avoid damage of the electronic devices we try to unplug them quickly. However, if we are out of the house, this is not possible.  So, I was thinking of some sort of "automatic switch" which disconnects the device from its power source by opening the circuit when there is a power outage, and which requires human action to turn back ON again.  Is there any simple switch or device that can do this task?


keep on getting '404 Not Found [IP: 91.189.95.85 80]' error when getting wine repository

I have been trying to download wine through  and I keep on getting this error when adding the repository using this command: Sudo add-apt-repository 'deb  groovy main' i have tried everything I have found online and nothing has worked. Logs: Hit:1 http://dl.winehq.org/wine-builds/ubuntu artful InRelease Hit:2 http://au.archive.ubuntu.com/ubuntu focal InRelease                       Hit:3 http://au.archive.ubuntu.com/ubuntu focal-updates InRelease               Hit:4 https://dl.winehq.org/wine-builds/ubuntu focal InRelease                  Hit:5 https://dl.winehq.org/wine-builds/ubuntu groovy InRelease                 Hit:6 http://au.archive.ubuntu.com/ubuntu focal-backports InRelease             Hit:7 http://dl.google.com/linux/chrome/deb stable InRelease                    Hit:8 http://packages.microsoft.com/repos/code stable InRelease                 Get:9 http://security.ubuntu.com/ubuntu focal-security InRelease [109 kB]       Ign:10 http://repo.vivaldi.com/stable/deb stable InRelease                      Hit:11 http://repo.vivaldi.com/stable/deb stable Release                        Hit:12 http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal InRelease Hit:14 http://ppa.launchpad.net/numix/ppa/ubuntu focal InRelease                Ign:15 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu focal InRelease Ign:16 http://ppa.launchpad.net/webupd8team/java/ubuntu focal InRelease Err:17 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu focal Release   404  Not Found [IP: 91.189.95.85 80] Err:18 http://ppa.launchpad.net/webupd8team/java/ubuntu focal Release   404  Not Found [IP: 91.189.95.85 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http://ppa.launchpad.net/webupd8team/java/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.


$K(u,v)$ is a simple extension of fields if $u$ is separable

I have problems to prove the following statement.     Let $K$ be a field and let $K(u,v)$ be an algebraic extension of $K$. If $u$ is separable over $K$ then $K(u,v)$ is a simple extension.   (My incomplete) proof: We can suppose that $char K=p$, because in characteristic $0$ all finite  extensions are simple. Let's divide the problem in $3$ cases (the third is problematic):  1) $v$ is separable. In this case $K(u,v)$ is a separable extension of $K$ and so it is simple.    2) $v$ is purely inseparable. We prove that $K(u,v)=K(u+v)$; by definition exists $m\in\mathbb N$ such that $v^{p^m}\in K$, so $(u+v)^{p^m}=u^{p^m}+v^{p^m}\in K(u^{p^m})$. So $K(u^{p^m})\subseteq K(u+v)$, but $u$ is separable on $K$ and follows that $K(u^{p^m})=K(u)$. Moreover $v=(u+v)-u\in K(u+v)$ and we can conclude that $K(u+v)=K(u,v)$.  3) $v$ is neither separable nor purely inseparable. ???    I would appreciate any hint about the point 3), but also a more organic proof without any subdivision.  Thanks in advance.


Prevent dangerous commands from going into bash history

What's the easiest way to prevent dangerous commands matching a pattern (like rm) from going into the Bash command history? I'd like to keep them away from the history of the current session, not just from the .bash_history file.


Trying to deploy to an Org I get this:  permissionsets/Our_Administrator.permissionset -- Error: Unknown user permission: CanInsertFeedSystemFields  I've figured out that the kind of settings an Org will accept depend whether or not a feature is enabled.  So what does CanInsertFeedSystemFields correspond to, and how can I switch it on or off.


I have a disk which has the capacity of 476 GB. I'm running Windows 7 64-bit. I want to check how much storage I've used on the C:\ drive.   The normal thing is to go to the "computer", and check the capacity property. According to the property I have used 324 GB.   When I enter the C:\ drive and select all files and folders (which are "Windows", "Users", "Program Files", "Program Files (x86)" ect...) and go the capacity property it says that the size on disk of these files is 100 GB.   Where is this 224 GB?


I have a doubt with preposition usage.  Why is it "at night" and "in evening/afternoon/".    If somebody could explain this exceptional case.


Why is the number of people reached by Community account only ~612?

On , this automated account has voted 16k+ times, edited 338 posts and has 59 helpful flags besides announcing the results of elections. Yet, why is the Impact as low as 612?


Prove equation using Bessel functions: $\frac{d}{dx}[xJ_n(x)J_{n+1}(x)]=x[J_n^{2}(x)-J_{n+1}^{2}(x)]$

The question is to prove that $$\frac{d}{dx}[xJ_n(x)J_{n+1}(x)]=x[J_n^{2}(x)-J_{n+1}^{2}(x)]$$  I have attempted using the product rule and the definition of Bessel but I just end up with a mess and no end in sight. Any help would be greatly appreciated.


How to buy a car for a road trip in the United States?

For tourists coming to the US, getting a car is a great way to get around, especially if you want to see the national parks. Rental, especially for younger drivers, can be very expensive, so buying a car is a good alternative. The process for buying and registering a car is aimed at US citizens and not tourists, so it is a little hard to find all the information.  How can a tourist buy a car in the US to take on a road trip, and what steps must they take?


Is there an upper limit to the Hulk’s strength?

Most incarnations of The Hulk I've seen or read about state that he is as strong as he needs, basically meaning that there is no limit to how strong he can get.  Is there any canon regarding this? Have we seen the upper limit of the Hulk's strength?


Is there any alternative to LibreOffice? It seems to unfamiliar to MS office users.  I found while running certain presentations in .ppt or .pptx it is not fully compatible.


Easiest way to know how many views my question got

I want to know the easiest way to know how many views my question got?


Finding maxima of a function $f(x) = 4x(16 - x)(6 - x)$ without calculcus

My question is how to prove that $f(x) = 4x(16 - x)(6 - x)$ has its maximum at point $x_0 = \frac{8}{3}$. I am trying to use arithmetic-geometric inequality, but I am unable to solve it.


I failed to update in terminal in ubuntu

Im trying to update to install hevc player in ubuntu but it is not working always i'm getting the same output anybody please help me!!!  sudarsan@sudarsan-Inspiron-3551:~$ sudo apt-get update E: Malformed line 1 in source list /etc/apt/sources.list.d/virtualbox.list (dist) E: The list of sources could not be read.


How to run a task in python for regular intervals between certain times?

I have a requirement where I need to run a task for every 5 seconds, but only between specific times (like between 1:30 and 2:30 tomorrow).  I looked at celery, but a normal task cannot be executed repeatedly in celery and the periodic tasks cannot be dynamically scheduled.  I also looked at APScheduler, but that doesn't support running it as a 'daemon' and scheduling tasks from outside.  Any idea what I could use to make this happen?  Edit: Should have mentioned this earlier, I need to do this during a web request, like a background task.


In a two column document in LaTeX, is there any way to put a table* (a table spanning both columns) at the bottom of the page?  The obvious doesn't work:  \begin{table*}[b]   % b!, hb, hb!, etc. doesn't work either    %... a wide table \end{table*}


Show that $A$ satisfies all the axioms to be a commutative ring with unity. Indicate the zero element, the unity, and the negative of an arbitrary a.   A is the set $ℤ$ of the integers, with the following "addition" $⊕$ and "multiplication" $⊙$ :   $$a \oplus b = a + b - 1$$ $$a ⊙ b = ab - (a+b) + 2$$  In regards to this question, I'm mostly struggling with how to apply these axioms with the given operations. For example, to satisfy axiom 2, does the following approach make sense? $Let\ a, b, c ∈ A$ $Then:$ $a = pq - (p + q) + 2$ $b = st - (s + t) + 2$ $c = xy - (x + y) + 2$ $And:$ $(a ⊙ b) ⊙ c = ([pq - (p + q) + 2] · [(s + t) + 2]) · [(x + y) + 2]$ $a ⊙ (b ⊙ c) = [(p + q) + 2] · ([st - (s + t) + 2] · [xy - (x + y) + 2])$


Delete a file with name '--help' using rm command

just want to share an interesting or rather accidentally discovered bug for Unix 'rm' command. I have accidentally created the file named '--help'. However, when I try to delete using rm command, it does not work and it shows up the help menu for rm instead. Same to mv command, I want to rename it to a valid filename, it shows the help menu of mv.    [Answer] To delete the file named '--help', try to use 'find' command.  Thanks for your reading and I hope it somewhat helps.


I am trying do something like this:-  public static ArrayList<myObject>[] a = new ArrayList<myObject>[2];   myObject is a class. I am getting this error:- Generic array creation (arrow is pointing to new.)


How do I execute a string containing Python code in Python?


Delegate to @RequestMapping by get-query parameter?

Is is possible to delegate different @RequestMapping methods by evaluation get-query parameter?  Example: if I call localhost:8080/cars?format=csv I want to invoke the first method.  But if I call  localhost:8080/cars?format=anyothervalue I'd like to invoke the second method. Is that possible in spring using @RequestParams?  @RestController public class MyServlet {     @RequestMapping("/cars", {format == 'csv'})     public Response doGetCsv(@RequestParam format) {      }      @RequestMapping("/cars", {format == 'xml'})     public Response doGetOthers(@RequestParam format) {      } }


In the following statement, why don't we consider red as noun even though it is the name of a color.      The apple is red.


Story where everyone lives in a walled city run by machines; another part of the planet has "non technology" people

I'm looking for help identifying a story where everyone lives in a city run by machines.  The main character has a helper robot who won't/can't do something or give him some information.  He goes deep into the city and a bigger machine makes him a new robot that can do "the thing" and the first robot shuts down.  I remember he goes up some stairs to the city wall and finds a ship, I think covered in sand outside the city walls.  He then travels to another part of the planet where the "non technology" people live, they try and make him stay using mind control, but he has the robot instructed to make sure he gets back, and to ignore him if he tried to give it other orders.  I thought it was by Arthur C. Clarke, but I'm not sure, I also thought it might be a two-part where the first part is written by Clarke and the second part written by someone else but I'm not to sure of these parts.


How do I merge my /boot partition to be a part of the / partition?

I am running Ubuntu Server 14.04.4 under VirtualBox on a Windows server. When I first set up the machine I opted to put /boot on its own 230 MB partition. This turns out not to have been necessary for my situation and now I’d like to roll /boot into the much larger partition I use for /. How can I safely make this change?


How can I use one argument as the default value for another?

I'd like to define a command that takes 1, 2 or 3 arguments, and where the 2nd gets the same value as the 1st if it is not defined. I tried  \newcommand\codefrom[3][#1][Matlab]{ ... }   but I get an error saying     ! Illegal parameter number in definition of \codefrom.   <to be read again>                      1   l.57 \newcommand{\codefrom}[3][#1][                                                                 Matlab]   Is there any way to accomplish what I want to do?


How do I change the login screen background in macOS Mojave?

I just updated to macOS Mojave, and immediately noticed a couple of things:   My custom login screen wallpaper is gone. When you click on a user's name in the login screen, it switches to their personal background (their usual wallpaper for the first space on the primary monitor).   I assumed it had just overwritten my cached image file. But when I went to replace it, nothing happened. It turns out that com.apple.desktop.admin.png is gone entirely!    Right after taking that screenshot, I decided to poke into Desktop Pictures and found my personal login screen background, which looks promising. It contains one other folder, which  probably  (edit: confirmed) contains the login screen background of my administrator account.


Prob. 4 (a), Sec. 20 in Munkres' TOPOLOGY, 2nd edition: Which of these functions are continuous in these topologies?

Let $\mathbb{R}^\omega$ denote the set of all infinite sequences of real numbers. Let the uniform metric $\tilde{\rho}$ on $\mathbb{R}^\omega$ be defined as follows:  $$\tilde{\rho}(x,y) \colon= \sup \left\{ \ \min \left( \ \vert x_i - y_i \vert \ , 1 \ \right) \ \colon  \ i = 1, 2, 3, \ldots \ \right\} \ \ \ \forall x = (x_i)_{i \in \mathbb{N}}, \ y=(y_i)_{i \in \mathbb{N}} \in \mathbb{R}^\omega.$$  Then the topology induced by this metric is called the uniform topology on $\mathbb{R}^\omega$.   And, the box topology on $\mathbb{R}^\omega$ is the one havaing as a basis all sets of the form  $$ (a_1, b_1) \times (a_2, b_2) \times (a_3, b_3) \times \cdots, $$ where $\left(a_i \right)_{i \in \mathbb{N}} \in \mathbb{R}^\omega$ and $\left(b_i \right)_{i \in \mathbb{N}} \in \mathbb{R}^\omega$ are such that $a_i < b_i$ for each $i = 1, 2, 3, \ldots$, and $(a_i, b_i)$ denotes the segment (i.e. open interval) with $a_i$ as the left endpoint and $b_i$ as the right endpoint.   Now with respect to which of the above two topologies on $\mathbb{R}^\omega$ are the following functions from $\mathbb{R}$ to $\mathbb{R}^\omega$ continuous?  $$f(t) \colon= (t, 2t, 3t, \ldots),$$ $$g(t) \colon= (t, t, t, \ldots), $$ $$h(t) \colon= (t, \frac{t}{2}, \frac{t}{3}, \ldots).$$   My effort:   The functions $f$, $g$, and $h$ are not continuous when $\mathbb{R}^\omega$ is given the box topology. The inverse image under each of  $f$, $g$, and $h$ of the basis element  $$B \colon= \left( -1, 1 \right) \times \left(-\frac{1}{2^2}, \frac{1}{2^2} \right) \times \left( -\frac{1}{3^2}, \frac{1}{3^2} \right) \times \cdots, $$  for example, contains the point $t = 0$ since  $$f(0) = g(0) = h(0) = (0, 0, 0, \ldots) \in B.$$ So, in order for this inverse image to be open in $\mathbb{R}$ with the usual topology, there must be an open interval $\left(-\delta_f, \delta_f \right)$, $\left( -\delta_g, \delta_g \right)$, and $\left( -\delta_h, \delta_h \right)$, for some positive real numbers $\delta_f$, $\delta_g$, and $\delta_h$, respectively, such that  $$ \left(-\delta_f, \delta_f \right) \subset f^{-1}(B),$$  $$\left( -\delta_g, \delta_g \right) \subset g^{-1}(B), $$ $$\left( -\delta_h, \delta_h \right) \subset h^{-1}(B). $$ In particular, we must have  $$f\left( \frac{\delta_f}{2} \right) \in B,$$ $$g\left( \frac{\delta_g}{2} \right) \in B,$$ $$h\left( \frac{\delta_h}{2} \right) \in B.$$  So, for each $n \in \mathbb{N}$, we have  $$\frac{n \delta_f}{2} \in \left( - \frac{1}{n^2}, \frac{1}{n^2}\right), \ \frac{\delta_g}{2} \in \left( - \frac{1}{n^2}, \frac{1}{n^2}\right), \ \frac{\delta_h}{2n} \in \left( - \frac{1}{n^2}, \frac{1}{n^2}\right), $$  and hence  $$n^3 < \frac{2}{ \delta_f } \ \mbox{ for all} \  n \in \mathbb{N},$$ $$n^2 < \frac{2}{ \delta_g } \ \mbox{ for all} \  n \in \mathbb{N},$$ $$n < \frac{2}{ \delta_h } \ \mbox{ for all} \  n \in \mathbb{N},$$ each of which is impossible.   Am I right?  That $g$ is not continuous was also shown by Munkres himself in Example 2, Sec. 19 on page 117.   What is the situation for the uniform topology? That is, which of these three functions is continuous relative to the uniform topology?


If $p$ is a prime. Then $x^{2} \equiv-1\ \pmod p$ has a solution if and only if $p\equiv 1\ \pmod 4$. Please explain in the easiest way.


I have a List<int> and a List<customObject>. The customObject class has an ID property. How can I get a List<customObject> containing only the objects where the ID property is in the List<int> using LINQ?  Edit: I accepted Konrads answer because it is easier/more intuitive to read.


How can I check the variable whether it exists or not

var a; typeof(a); //undefined  typeof(c); //undefined  if(c) {} //throw error   How can I know that c doesn't exist without try catch.    Update after marked duplicate: typeof initializedVariable and typeof notInitializedVariable both will show 'undefined'. My question is to know whether the variable exists(initialized) or not.


What exactly is weakly informative prior?

Is there a precise definition of weakly informative prior?  How is it different from a subjective prior with broad support?


I tried to run a perl script inside my other shell script but I have faced the following snag:  Can't locate new.pm in @INC (@INC contains:  /usr/local/lib/perl/5.10.1 /usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl  I have specifically set the path where the additional local perl script, i.e,  "new.pm" in my Perl script (test.pl) but the error still appears. (perl -V) shows the path of  my local Perl. I have further also set the the path of my "new.pm" in my profile file using the command "PERL5LIB". However, when I run the script on a command line as: ./test.pl   it does work like a charm. PS. The she-bang line is properly set. PSS. Platform: linux, OS_vers=2.6.32-5-amd64


Find the volume of the intersection of the regions $x^2+y^2\leq R^2$ and $x^2+z^2\leq R^2$ for any $R>0$.

I'm not sure if I use spherical coordinates for this question


The confusion between "The" or "A" article

I was reading about articles in Wren & Martin and found the following explanation:  1)Use the definite article when a singular noun is meant to express a whole class.       The cow is a useful animal     [Or we can say, "cows" are useful animals]  2)Use the indefinite article in the sense of "any" to single out an individual as the     representative of a class; as,       A cow is a useful animal.   Can you please explain me the difference between 1 and 2.    I also found a given below sentence in wren & martyn's exercise.        __ lion is ___ king of beasts   As per above given explanation of definite and indefinite article, I am not sure which one should be correct: "The lion" or "A lion", or both are correct.  Could you please help me understand the difference better.


I have a problem in my programm, I want the user of my programm to write the file he wants to use and then with loops, depending on the word he typed, a file will be used. Butmy programm never enters in one loop and I don't know where the problem comes from.  Here is my code:          System.out.println("Nom du test case à lancer ? : ");     Scanner saisieUtilisateur = new Scanner(System.in);      //on rentre l'adresse du fichier texte :     String str = saisieUtilisateur.next();     System.out.println(str);     //Integer val = saisieUtilisateur.nextInt();     //System.out.println(val);     String chaine = "";     String File="";     int i=1;      //Choix du fichier a prendre en compte suivant le choix de l'utilisateur     if (str == "hello"){         File = "C:\\exempleANT\\helloWordTexte.txt";         System.out.println("dans la boucle 1");     }     else if(str == "bye"){         System.out.println("dans la boucle 2");         File =  "C:\\exempleANT\\FichiersTestExempleHelloWord\\bye.txt";     }     else if(str == "fake"){         System.out.println("dans la boucle 3");         File =  "C:\\exempleANT\\FichiersTestExempleHelloWord\\helloWordTexteFake.txt";     }     else  {         System.out.println("ErreurTexte!");         System.out.println("dans la boucle 4");      }   And here is the result in the console when I run the programm and I type hello.  hello hello ErreurTexte! dans la boucle 4


Sorry if it's an amateur question. I cant seem to find the right answer to it. What is the android (java) equivalent of swift's:  "somestring".data(using:.utf8)   method?  Thanks a lot  EDIT:  I am creating a java version of the following method:  guard let data = "\(user):\(password)".data(using: .utf8) else { return nil }  let credential = data.base64EncodedString(options: [])  return (key: "Authorization", value: "Basic \(credential)")


The review link, compared to the help dropdown, is not well aligned. Should probably align the 2 of them more properly.


How to backup external NTFS drive via Time Machine?

I currently have an external, HFS+ drive as my time machine storage that backs up my Macbook Pro Retina (Mac OS Mountain Lion 10.8.1). I also have another external NTFS drive (that I share with my Windows Desktop) which has all my photos etc which I would like to backup via Time Machine.  i.e.  Current  Macbook Pro Retina ===> external Time Machine drive   Desired:  Macbook Pro Retina ===\                        +====> external Time Machine drive External NTFS drive ==/   If I go into the Time Machine preferences, I see the external NTFS drive (as well as all other NTFS/HFS+ drives) inside the exclude list. I can also remove the NTFS drive of interest from this exclude list - thereby including it into the backup list.  The problem is that the settings aren't sticky. When I reenter the Time Machine preferences, the external NTFS drive is again seen on the exclude list. And the actual files themselves aren't backed up either.  So, how can I backup the data on my external NTFS drive via Time Machine?


Deriving the conditional distributions of a multivariate normal distribution

We have a multivariate normal vector ${\boldsymbol Y} \sim \mathcal{N}(\boldsymbol\mu, \Sigma)$. Consider partitioning $\boldsymbol\mu$ and ${\boldsymbol Y}$ into  $$\boldsymbol\mu = \begin{bmatrix}  \boldsymbol\mu_1 \\  \boldsymbol\mu_2 \end{bmatrix} $$ $${\boldsymbol Y}=\begin{bmatrix}{\boldsymbol y}_1 \\  {\boldsymbol y}_2 \end{bmatrix}$$  with a similar partition of $\Sigma$ into $$  \begin{bmatrix} \Sigma_{11} & \Sigma_{12}\\ \Sigma_{21} & \Sigma_{22} \end{bmatrix} $$ Then, $({\boldsymbol y}_1|{\boldsymbol y}_2={\boldsymbol a})$, the conditional distribution of the first partition given the second, is  $\mathcal{N}(\overline{\boldsymbol\mu},\overline{\Sigma})$, with mean $$ \overline{\boldsymbol\mu}=\boldsymbol\mu_1+\Sigma_{12}{\Sigma_{22}}^{-1}({\boldsymbol a}-\boldsymbol\mu_2) $$ and covariance matrix $$ \overline{\Sigma}=\Sigma_{11}-\Sigma_{12}{\Sigma_{22}}^{-1}\Sigma_{21}$$  Actually these results are provided in Wikipedia too, but I have no idea how the $\overline{\boldsymbol\mu}$ and $\overline{\Sigma}$ is derived. These results are crucial, since they are important statistical formula for deriving Kalman filters. Would anyone provide me a derivation steps of deriving $\overline{\boldsymbol\mu}$ and $\overline{\Sigma}$ ? Thank you very much!


Textbook recommendation for differential equations

I'm in need of a textbook/workbook that covers differential equations with plenty of practice questions and exercises. A textbook with a particular focus on Nonlinear Ordinary Differential Equations and Dynamical Systems would be great.  Thanks


I am a student in an introductory statistics course and I am working on my project regarding number of hours I spend working my job a day. We went over normal probability plots and I am now trying to build one for my data in excel. Could someone walk me through how to do it? I tried to YouTube, but I have so many repeated values that I am confused about whether I can even use a normal probability plot.   This is the data I have(each value is the number of hours I spent daily on an activity):  1,2,2,3,3,3,3,3,3,3,3,3,3,4,4,4,5,5,5,6,6,7,7,7


While binding the data always getting extra row ...   {this.state.items.map(myitems1 => {             return (
                 {myitems1.Item_x0020_Name}                 <button onClick={e => this.dosometing(myitems1.Id)}>                   Offline                 </button>
             );           })}   Heading


How to create haze around a uv sphere with emission shader

So, I have this lit up ball on a black background.    The background needs to be black, and i would like a sort of haze around the ball. Other questions did not solve my problem. I was thinking something with a volume scatter node, but i tried it and it doesn't work with a black background.  Here's the world setup:   So, yeah. Any help would be great. Thanks!


There are $2014^{2014}$ children at a mathematics camp. Each has at most three friends at the camp, and if A is friends with B, then B is friends with A. The camp leader would like to line the children up so that there are at most $2014$ children between any pair of friends. Is it always possible to do this?  I thought maybe the pigeon hole principle. Obviously the 2014 is arbitrary. I googled it looking for a solution and it turns out it is from the BMO round 2. there it is 2010. Any help would be much appreciated.


Can I travel straight to Holland from the United Kingdom on my Etats Schengen multi visa

I am planning to travel to Holland on my multi entry 3 months visa that was issue by the French embassy in the United Kingdom. I have been to Paris 2 weeks ago for 2 days.


Lob Logical Read and lob read-ahead reads in NCCI

I have a test table with following structure.  CREATE TABLE [dbo].[DW_test]( [ID] [bigint] IDENTITY(1,1) NOT NULL, [CourtCaseID] [int] NOT NULL, [ActionID] [int] NOT NULL, PRIMARY KEY CLUSTERED([ID] ASC)   Next I populated my table with about 470 million records with the following script.  insert into DW_test --select count(*) --from ( select top 1000000 abs(checksum(newid())) % 100000 + 1 a, abs(checksum(newid())) % 10 + 1 b from sys.all_objects cross join sys.all_objects a cross join sys.all_objects b cross join sys.all_objects c cross join sys.all_objects d cross join sys.all_objects e cross join sys.all_objects f cross join sys.all_objects g --) t GO   The script was executed about 470 times to generate 470 million records in the table and created NCCI on that table.  CREATE NONCLUSTERED COLUMNSTORE INDEX [IX_test1] ON [dbo].[DW_test] (     [CourtCaseID],     [ActionID] )   Next I test simple query to count the records in the table.  DBCC DROPCLEANBUFFERS GO select COUNT_BIG(*) from DW_test    If I turn SET STATISTICS IO ON I get the following results  With cold cache     Table 'DW_test'. Scan count 25, logical reads 3, physical reads 0, read-ahead reads 0, lob logical reads 469697, lob physical reads 1, lob read-ahead reads 1877324.      Table 'DW_test'. Segment reads 453, segment skipped 0.      Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.   With warm cache     Table 'DW_test'. Scan count 25, logical reads 3, physical reads 0, read-ahead reads 0, lob logical reads 229248, lob physical reads 0, lob read-ahead reads 0.      Table 'DW_test'. Segment reads 453, segment skipped 0.      Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.`   I know that 1 logical read is a single data page read from buffer pool during query execution and 1 physical read is a single data page read from disk.  that read-ahead read is:      This number tells us how many of the physical reads were satisfied by SQL Servers ‘Read-ahead’ mechanism.  This is directly tied to physical reads, so if there are no physical reads, you will have 0 for Read-Ahead reads.    In my case I am dealing with lob logical, physical and read ahead reads. I want to understand what this number means in my particular case.   How it is possible to have only 1 lob physical read with cold cache if the table has about 470 million records?  How it is possible the total number of lob pages decreased from about 2.3 million in cold cache to about 220k in warm cache?


What do \makeatletter and \makeatother do?

Many LaTeX “hacks” begin with \makeatletter and end with \makeatother. What do these commands do?


How to get the bounding box (meters) of an entire Unity gameobject, including all its child objects

How do you get the meter-accurate bounding box of an entire Unity GameObject, including all its child objects? It seems encapsulate bounds does not generate the right units at all     bounds = new Bounds ();     Renderer[] renderers = GetComponentsInChildren<Renderer> ();     foreach (Renderer renderer in renderers)     {         bounds.Encapsulate (renderer.bounds);     }  I've tried using encapsulate bounds on a round cushion with only a single child object containing 1 renderer.  Bounds encapsulate above gives (10.3037,10.17837,10.30449)  Just squooshing a Unity cube to size it gives (0.6185507,0.1842149,0.6185507)   A round cushion as you know is small on one side, so the bounds result isn't accurate. How does one script a result closer to the second result above?


How do I block my ISP from framing websites?

I've noticed recently, as of today, that all the websites I visit (except for a specific few sites such as Google) are all put into a frame. I'm not sure what the reason for this is, there are no ads displayed and everything appears normal. The only reason I found out is because the headers weren't loading correctly and none of the page titles showed up properly - I quickly checked the source code and saw that instead of the source of the page I was expecting to see, there was a single line with a frame.  I first thought maybe somekind of trojan, but after going through various checks I've determined it's my ISP and/or somekind of Internet Registry (I traced the IP shown in the source code)  What can be done to prevent this frame, short of using a VPN? I feel like I am being spied on.  PS: I'm located in South Korea.  The source code looks like this: [copied from OP's comment to avoid the auto-formatting – grawity]  <html><frameset rows='0,*' border='0'><frame src='http://210.91.57.226/notice.aspx?p=P&s=1495361&h=sitename.com&us=5,841,6&cs=10489585&rt=Y'><frame src='http://sitename.com/?'></frameset></html>


I am using Ubuntu 14.04. How to manage startup applications from terminal?  I have refered   I would like to know CLI method. I am not asking to create .desktop file.


I am confused as to what really a function is ?    Is a function the steps by which we get the output from an input ?   Or is it the name of the process by which we get the output from an input ?


Running apt update results in 404 not found on supported version

When I run sudo apt update, I get a 404 Not Found error:  me@K2SO:~$ sudo apt update Ign:1 http://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64  InRelease Hit:2 http://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1604/x86_64  Release                                                                                Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                Hit:4 http://packages.microsoft.com/repos/vscode stable InRelease                                                                                Hit:5 http://security.ubuntu.com/ubuntu disco-security InRelease                                                                                Hit:6 http://us.archive.ubuntu.com/ubuntu disco InRelease                                                                                Hit:7 https://updates.signal.org/desktop/apt xenial InRelease                                                                                Hit:8 http://dl.google.com/linux/chrome/deb stable Release           Hit:9 http://us.archive.ubuntu.com/ubuntu disco-updates InRelease    Hit:11 http://ppa.launchpad.net/samoilov-lex/sway/ubuntu disco InRelease Hit:12 http://us.archive.ubuntu.com/ubuntu disco-backports InRelease Ign:13 http://ppa.launchpad.net/simonschneegans/testing/ubuntu disco InRelease Hit:15 http://ppa.launchpad.net/snwh/ppa/ubuntu disco InRelease Err:16 http://ppa.launchpad.net/simonschneegans/testing/ubuntu disco Release   404  Not Found [IP: 91.189.95.83 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/simonschneegans/testing/ubuntu disco Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.   It's my understanding that 19.04 is still currently supported, and there's nothing else to upgrade to. I tried using the solution , but that's way back from 2014, and it didn't work.   How do I fix this error?