Ubuntu OpenStack and What Did I Miss Here?

I downloaded  (it's the second "entry" on the page). The download link took me to  (where the download began). I downloaded the latest server package, which is 13.10.  The best I can tell, there's no Cloud stuff on that CD. When I installed the server package, I was asked if I wanted to enable the SSH server, the SAMBA server, install a print server, etc. But there was no choice for "Cloud Server".  Additionally, after reboot, there is nothing running that looks like its cloud related, like Keystone (identity management), Glance (image manager), Nova or Nuetron (compute), Ceph or Swift (object storage), etc.  I'm obviously missing something, here, but I don't know what it is. The advertised steps are:    Create a startup disk USB Stick Insert it in your computer and reboot Start using your local private cloud   OpenStack is moving so fast my recipes for installing it and running it on Ubuntu are already ancient. That includes my books like .  What, precisely, does Ubuntu OpenStack provide? Am I supposed to do something else next (apparently, but I don't know what)?


At what voltage is a NiMH battery empty?

I have a battery pack of NiMH batteries. It is ten cells with 1.2V, 4000mAh each, put together in series. So rated voltage is 12V. After charging, i.e. when the charging device says that it is finished, I measure 14.3V.   When I now discharge, at what voltage should I consider my battery as "empty"? Is this the lowest voltage that I can discharge it to without damaging it? Which voltage is that?


Independent samples t-test with unequal sample sizes

I have two independent groups: from one I have drawn a sample of size less than 30 due to its small population, while the second group has sample size 100.  Is it appropriate to use an independent samples t-test in this case?


The words break in fully justification of text in latex. I need document format "Report" and fully justified text. My latex code is   \documentclass[12 pt]{report}  \usepackage{times} \usepackage[english]{babel} \usepackage{geometry}  \geometry{ a4paper}  \usepackage{siunitx} % Required for alignment \usepackage{enumitem} \usepackage{ragged2e}  \begin{document}  \begin{flushleft}  \justifying  \chapter*{  Abstract}  Banana (\textit{Musa paradisiacal L}) is the fourth most important crop in the world after rice, wheat and maize. Banana cultivation in Nepal is more popular like other agricultural products and has annual production of about 5000 tons. There are large plantation in Kailali and Nawalparasi districts and other districts as well. The thick, fleshy and fibrous pseudo stems that are leftover after harvesting the bananas can be used to extract high quality fiber. Farmers usually throw away this whole stump because it is big and heavy and takes a long time to rot and the animals do not eat it. Research shows, about 10-13 stem of banana can provide 2 Kg of fibre worth of about Rs.500. Usually farmers are extracting banana fibres manually or the machine costs expensive when bought from other countries as such machines are not manufactured in Nepal. Our group have studied the feasibility of developing such machine with low cost which ultimately provides opportunity of local entrepreneurship to farmers and helps in proper utilization of agricultural management. Along with it, this encourages farmers to cultivate more banana and makes country self-dependent in fibre.  \newline \\ \textbf{Keywords : Banana fibre, 5000 tons , manual extraction, 10-13 stem produce 2Kg fibre ,  Extraction machine} \end{flushleft}  \end{document}     I don't want the encircled text to break.


Find the sum of series $$1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4} + \frac{1}{6} + \frac{1}{8} + \frac{1}{9} + \frac{1}{12}+\cdots,$$ where the terms are the reciprocals of positive integers whose only prime factors are two's and three's:


In the 4th Harry Potter book I read that Poliakoff (Durmstrang student) when he spotted Harry Potter he pointed Harry's scar to a girl standing next to him, this occurence happened when they first arrived at Hogwarts for the Triwizard tournament. The girl was never identified as a Hogwart, Beauxbaton or Durmstrang student. Is there canon evidence of what school she came from and can females attend Durmstrang?  Also the wikia says the girl is from Durmstrang, but they don't give evidence. Someone told me that Durmstrang was an all-male school, but I assumed it was since no females are known that have joined.


any way to texture hair particles mid strand? like have brown hair with white frosted tips or a pink star in the middle?


How to reduce the CPU speed to 1% of actual CPU speed for a specific Windows process?

I have a Windows software with a GUI that does cool things but too quickly (I cannot figure see all the editing it does in realtime because it goes too fast).  How to reduce the CPU speed to 1% of actual CPU speed for a specific Windows process myprogram.exe ?


I am tripped up with the correct usage of 'are' or 'is' in the following sentence. Any quick explanations as to why this simple sentence may cause confusion?  Here 'are/is' the list of scholarships and the application.


Can someone please explain what's wrong with this code?

This program does the following: First input obtains two numbers from the user, second input if the user inputs (+) symbol the program adds the two numbers together, if the user enters (-) symbol it subtracts the 1st number from the 2nd number.  But no results are shown the program just runs and terminates.   import javax.swing.JOptionPane;  public class ObtainNumber { public static void main(String []args) {      String strNum1 = JOptionPane.showInputDialog("Enter the first number");     String strNum2 = JOptionPane.showInputDialog("Enter the second number");      int num1 = Integer.parseInt(strNum1);     int num2 = Integer.parseInt(strNum2);      String askForOperation = JOptionPane.showInputDialog("What operation needs to be done?");      int sum;     if (askForOperation == "+") {             sum = num1 + num2;             JOptionPane.showMessageDialog(null, "The result of the Addition is " + sum);     }      double subtract;     if (askForOperation == "-") {             subtract = num2 - num1;             JOptionPane.showMessageDialog(null, "The result of the subtraction is " + subtract);      }        }   }


Im using a Macbook right now and I bought Rome 2 Total War with Steam, however I've just bought a new gaming laptop which is Windows.  I wonder if I'm able to download my game on my new laptop from Steam? I do know that Rome 2 Total War works fine on both OS's  Thans for the answer!


Is notarized consent letter from father is mandatory for mother to accompanying infant while traveling out side USA?

My wife is planning to travel our home Country(India) for a period of 4 months. We have 9 months old Son. He has Valid US passport and valid PIO(Person of Indian Origin) Card . I am aware if any one other than parents required notarized consent letter from parents to accompanying infant to travel out side USA.  What if one of parent is accompanying infant to travel outside USA? Does notarized consent letter from other parent is mandatory?


Apply Formula to a Range of Cells without Drag and Drop

Typically, in Excel, one can autofill a column by drag a cell down. However, with a lot of cells to fill up, manually dragging and scrolling the spreadsheet is time consuming.  Is there a much better way to fill up a column with formulas?  Edit: I tried to input the $F$1:$F$20000 at the highlighted place, but the values inside column F is not populated.


Why does only the Horizon render, but not objects?

So, whenever I render a image, only the sky shows up.    but, it is supposed to show like this:


MTG Does "Emerging" cause summoning sickness?

If I emerge a card like Mockery of Nature, does it get summoning sickness?


What does it mean when there are two pipes (||) next to each other?

An example of it in use would be...  if (temp < 30 || temp > 90) { MessageBox.Show("Error"); }   What do two pipes (||) together mean?


Etymology of "save" in the meaning of "except", "but", "unless"

Why does save also mean     other than : but or except "We had no hope save one."      except for the fact that :  only —used with that       but, except —used before a word often taken to be the subject of a clause       "Little is known about his early years save that he left home when he was very young."   This question is specifically about the origin/etymology of this particular meaning of the word.  Merriam-Webster just says      Middle English sauf, from Anglo-French salf, sauf, from Latin salvus safe, healthy; akin to Latin solidus solid, Greek holos whole, safe, Sanskrit sarva entire   I am able to connect solid or whole or entire with the common meaning of safe/save, but how is it connected with except/but/unless?  Supplementary question: is this usage of save now archaic? M-W doesn't say so, but I have never heard it used in a live speech.


Onward travel details for Schengen visa through Austria

I'm applying to the Austrian embassy for a multiple-entry Schengen visa. As per the checklist, they require "proof of onward travel in EU". Had a couple of questions regarding this:   Is this a mandatory requirement since pre-booking rail/bus bookings for travel out of Austria and then not obtaining a visa, would be wastage of money? Is there a way to reserve rail/bus tickets in a manner similar to reserving flight and hotel tickets before applying for a visa?   Thanks in advance!


Not Enough Items (Minecraft 1.6.4) Not working

Whenever I click on cheat mode in my game, it tells me it is selected, but it is always recipe mode. Even though the selection in the config is set to -1


Did a clean install 16.04.3lts on a Lenovo T60. After updating and restart. It goes to blank screen.    Not sure what to do next


How to create traffic light indicator in sharePoint list?

I have 'Status' column having values 'Draft','Completed','In progress', 'Backlog'  Now I want to show corresponding Color code in 'traffic light' column.   Draft-->Grey Completed-->Green In progress-->Yellow Backlog-->Red   Kindly let comment if you have inputs regarding the same.


Is an ideal which is maximal with respect to the property that it consists of zero divisors necessarily prime?

This is in follow-up to .     Let $R$ be a commutative ring with identity and consider the set $Z \subset R$ of zero divisors. If the ideal $I\subset Z$ is maximal with respect to the constraint, need it be prime?    Since Zorn's Lemma applies equally well to proving that either minimal prime ideals exist or that maximal ideals contained in $Z$ exist, this would provide an alternative proof of that question if true.  A naive approach to proving this is to assume $ab \in I$ with $a, b \notin I$. Since $ab \in I$, it follows that $ab$ is a zero divisor, so $abx = 0$ for some $x \neq 0$, and therefore either $a$ is a zero divisor annihilated by $bx \neq 0$ or $b$ is a zero divisor annihilated by $x$. In either case, the obvious thing to consider would be $aR+I$ or $bR+I$, but there's no obvious reason why either of these ideals should consist of zero divisors.  According to rschwieb, the answer is yes for reduced Noetherian rings.


So, I am creating my first Pathfinder character ever right now together with some friends. We are all new at this.  I figured I'd go for a half-elven Cleric.  Everything good so far. But! The two favored classes option confuses me. I didn't find anything specific about them in the core rulebook. How exactly do they work? Are they just an inherent option that gives you bonuses if you level up in a class, regardless of whether you pursue it or not or do they count as a choice of class? Multiclassing lvl 1 upwards is kind of a weird idea and I am sure I must have gotten something wrong.  Thank you all in advance! -derhoques


Expectation formula of an integrable random variable

Given $X$ is integrable. Prove that $E(X) = \int_{0}^{\infty} [1-F(x)]dx - \int_{-\infty}^{0}F(x)dx$.  My 2ND solution Since $X$ is integrable, $E(X) = E(X^{+}) - E(X^{-}) = \int_{0}^{\infty} xdF_{X^{+}}(x) - \int_{0}^{\infty} xdF_{X^{-}}(x) = \int_{0}^{\infty} [F_{X^{-}}(x) - F_{X^{+}}(x)]dx$.   Now, since $F_{X^{-}}(x) = P(-min(X,0)\leq x) = 1 - P(\min(X,0)<\ -x) = 1 - P(X<-x)$  (since for $x\in (0,\infty), P(0<-x) = 0$)   $= 1 - F_{X}(-x)$, $E[X] = \int_{0}^{\infty} [1 - F_{X}(-x) - F_{X^{+}}(x)] dx = \int_{0}^{\infty} 1 - F_{X}(x) - \int_{0}^{\infty} F_{X}(-x)dx$ (the last equality is because for $x\in (0,\infty), F_{X^{+}}(X) = F_{X}(x)$).   Finally, by using the change of variable $u=-x$ for the 2nd integral, with $u$ as a dummy variable, we easily get the RHS that we need (Q.E.D)  My question: Could someone help review the solution above to see if it's correct this time? Would really appreciate any input.


This should be a very easy question but it might just be that I'm confusing myself. So we have the definition of a function $f$ on $S$ being continuous at $x_0$:     For any $\epsilon$>0, there exists $\delta>0$ such that: whenever $|x-x_0|<\delta$, we have $|f(x)-f(x_0)|<\epsilon$   And I assume the negation is     There exists $\epsilon$>0 such that for all $\delta>0$, $|x-x_0|<\delta$ yet $|f(x)-f(x_0)|\ge \epsilon$.   Now I want to show that the function $f(x)=\sin(\frac{1}{x})$ together with $f(0)=0$ cannot be made into a continuous function at $x=0$. So I need to show that there exists $\epsilon>0$ such that for all $\delta>0$, $|x|<\delta$ yet $|f(x)|\ge\epsilon$.  Let $\epsilon = \frac{1}{2}$. Then no matter what $\delta$ we choose, let $|x|<\frac{1}{2}$. It is certainly possible that $|f(x)|\ge \frac{1}{2}$, because, well, $\frac{1}{x}$ can really take on arbitrarily large value as $x$ is small.  Now, what confuses me is that, as $x$ gets small, $f(x)$ can certainly be greater than $\frac{1}{2}$ for infinitely many times, but it will be less than that infinitely many times, too. But I suppose it doesn't really matter. So I think there's something wrong with my negation but I couldn't figure out where.  Update: The correct version can be found . Watch for Lemma 4.6


Our GM won't let us affect the story; the more I play the less fun I have. What do I do?

I was wondering if anyone could give me some advice or anything on a GM situation.   My current GM is running a campaign and it is very video game/anime like. It started out super fun and the deeper we get the less fun I have. The reason is, it feels like GM is telling us a story but we cannot interact or change anything during his, "cut scenes". No matter what any player does he just says, "No it didn't work," or, "Yeah you do that. See if you roll a 20." We also can't damage any boss he has until we reach the point in the story that he has planned, so our interactions we have with villains don't matter.  I feel like he is making us sit there and listen to an anime he has come up with in his head. Since the players can't change or react to the key situations. I find my self sitting there thinking, why would I react, it doesn't matter.  It's not just me either. Another player feels the same way. I am going to talk to my other fellow players soon about it and see how they feel.  Side note: the GM as a person is very defensive and I am afraid to confront him about it because I know he will throw a fit. We have also caught him straight lying about abilities and stats on his own PC in other campaigns, and he doesn't take to kindly when you call him out.  He is new to GMing. This is only the second game I have played with him as a GM. The first one had one session the he just never wrote more for.  Is there anything I can do to maybe get him to more lenient with his story? I really enjoy the story for the most part and if he would just let our characters do things and give us a chance at stopping his villians or letting us change the story based on our actions, everything would be cool.


Following the QGIS installation guide I have tried both UbuntuGIS and QGIS stable, but both fail with the error message:  The following packages have unmet dependencies:  python-qgis : Depends: python-qgis-common (= 2.6.1.1+trusty1) but it is not going to be installed             Depends: libqgispython2.6.1 but it is not going to be installed            Depends: libqgis-analysis2.6.1 but it is not going to be installed            Depends: libqgis-core2.6.1 but it is not going to be installed            Depends: libqgis-gui2.6.1 but it is not going to be installed            Depends: libqgis-networkanalysis2.6.1 but it is not going to be installed   qgis : Depends: libgdal1h (>= 1.8.0) but it is not going to be installed      Depends: libqgis-analysis2.6.1 but it is not going to be installed     Depends: libqgis-core2.6.1 but it is not going to be installed     Depends: libqgis-gui2.6.1 but it is not going to be installed     Depends: libqgis-networkanalysis2.6.1 but it is not going to be installed     Depends: qgis-providers (= 2.6.1.1+trusty1) but it is not going to be installed     Recommends: qgis-plugin-grass but it is not going to be installed     Recommends: qgis-plugin-globe but it is not going to be installed   E: Unable to correct problems, you have held broken packages.    I had QGISv.2.4 running on my machine with Ubuntu 12.04. After upgrading to Ubuntu 14.04 I was getting error message that pyqgis could not be loaded.  So I uninstalled QGIS using the Ubuntu Software Center and also run  sudo apt-get purge qgis   After that I tried to install the latest version of QGIS Debian Stable and UbuntuGIS unstable but getting the error messages described above.  The weird thing is that neither Ubuntu Software Center nor apt-get list have QGIS listed as installed, but if I run a search for qgis on my file system qgis and all its dependencies are still there. That's why I getting told to have broken packages.


\sigma appearing in composite character (out of nowhere)

\documentclass[a4paper]{report}  \usepackage{mleftright} \usepackage{amsmath} \usepackage{amssymb} \usepackage{braket}  \begin{document}  \begin{align} \langle \hat{\widetilde{S_{\hat{a}}}}^{\, \, \, \mleft( 1 \mright) } \hat{\widetilde{S_{\hat{b}}}}^{\, \, \, \mleft( 2 \mright) } \rangle_{\ket{ss}} & = \langle \mleft( \mleft( \hat{a} \cdot \vec{\hat{\sigma}}^{ \mleft( 1 \mright) } \mright) \otimes \hat{\mathbb{I}}^{ \mleft( 2 \mright) } \mright) \mleft( \hat{\mathbb{I}}^{ \mleft( 1 \mright) } \otimes \mleft( \hat{b} \cdot \vec{\hat{\sigma}}^{ \mleft( 2 \mright) } \mright) \mright) \rangle_{\ket{ss}} \nonumber \\ & = \langle \mleft( \hat{a} \cdot \vec{\hat{\sigma}}^{ \mleft( 1 \mright) } \mright) \otimes \mleft( \hat{b} \cdot \vec{\hat{\sigma}}^{ \mleft( 2 \mright) } \mright) \rangle_{\ket{ss}} \, . \end{align}  \end{document}   produces the following output:   In fact, it creates a bunch of errors which seem to be due to using nested expressions of \widetilde, \hat, and such via the amsmath package. Curiously, those errors do not show up in my overall document.  Anyway, the same output is produces and as you can see, sigmas somehow show up at the S symbol although they are only used later in the line ...  Also, the equation reference parenthesis are right of the page limit in my overall document, which may not be so obvious here.  I tried the same thing without \mleft( and such, but I like it better this way.  EDIT: After properly reading the question that egreg linked to, this is what comes closest to the desired result for me:  \documentclass[a4paper]{report}  \usepackage{mleftright} \usepackage{amsmath} \usepackage{amssymb} \usepackage{braket}  \newsavebox{\accentbox}  \newcommand{\compositeaccents}[2]{%   \sbox\accentbox{$#2$}#1{\usebox\accentbox}}  \begin{document}  \begin{align} \langle \compositeaccents{\hat}{\widetilde{S_{\hat{a}}^{\mleft( 1 \mright) }}} \compositeaccents{\hat}{\widetilde{S_{\hat{b}}^{\mleft( 2 \mright) }}} \rangle_{\ket{ss}} & = \langle \mleft( \mleft( \hat{a} \cdot \vec{\hat{\sigma}}^{ \mleft( 1 \mright) } \mright) \otimes \hat{\mathbb{I}}^{ \mleft( 2 \mright) } \mright) \mleft( \hat{\mathbb{I}}^{ \mleft( 1 \mright) } \otimes \mleft( \hat{b} \cdot \vec{\hat{\sigma}}^{ \mleft( 2 \mright) } \mright) \mright) \rangle_{\ket{ss}} \nonumber \\ & = \langle \mleft( \hat{a} \cdot \vec{\hat{\sigma}}^{ \mleft( 1 \mright) } \mright) \otimes \mleft( \hat{b} \cdot \vec{\hat{\sigma}}^{ \mleft( 2 \mright) } \mright) \rangle_{\ket{ss}} \, . \end{align}  \end{document}   The sigmas have disappeared but through use of the saveboxes, the S operators look somewhat different than in other instances in the document, but it's good enough for me.


What governs when people go into different stages of education?  I have noticed at different times that my Grade School might be full, High School empty, and College have a few people.     I know that people won't go to school if they are not available, but do they only go to school if jobs are available within that education level?  Question flagged as a duplicate, which is fair enough, but the answer given provides a better answer than the original thread.   Can both be merged?


Encrypting an extra partition with ecryptfs?

I have an extra ext4 formatted partition which I would like to ecrypt with ecryptfs. I have chosen not to go for home directory ecryption and having a encrypted private directory also hasn't helped me.   So, the remaining option for me is to encrypt the extra partition. So, I want to know what is the best way to achieve this. The drive should get mounted when I log in. And I should be able to move my Documents and other important folders in the home directory to the encrypted drive, and symlink them back to the home directory. As I save some passwords in firefox, should I move the hidden firefox folder in the home directory to the encrypted drive?


Windows Server 2016 scheduled task schedule must be in future

We have a 2012 server that has about 20 scheduled tasks that are used for monitoring.  We have built a 2016 server to replace it and as I move tasks to the new server I have run into an issue.  Most of our tasks run every few minutes.      In Server 2012 we would schedule the task to start at 1200AM of the current day (so a time in the past) and reoccur every X minutes.  The task would start at its next scheduled time.  Perfect.  In Server 2016 schedules that start in the past don't run.  So we had to schedule it to start in the future.  This is fine until you reboot.  Now the start time is in the past and it won't run.  It doesn't even register a failed run.  The Next Run Time column shows that it should run but doesn't.    Besides creating two triggers, one that starts in the future and another that starts on reboot (which we don't want to do since some tasks should only run at specified times), is there a better way?  This seems to be a bug.  The 2012 version worked great.  UPDATE  There is a workaround for this.  Create a one time schedule that runs indefinitely.  This works after restarts just like you would expect.  I know this isn't great for schedules that are "weird" but works fine for things that we want to run every 3 minutes or whatever.


finding time of the file received in a directory on reading a filename

I read a file which have all the file names line by line which ($var) returns the file names in the directory /home/mydir .  input="/home/mydir/test/myfile" while IFS= read -r var do /home/mydir/"$var" done < "$input"   Now i want to find whether the file is in that directory for more than 5 hours in a if loop.  How to do that ?


Postfix: disable authentication through port 25

When  using Postfix and IMAP on a mailserver, at least 3 ports are usually opened  25 smtp   : incoming emails from anybody (whole internet) 465 smtps : outgoing emails from authorized users (to the whole intenet) 993 imap  : imap for authorized users   I would like to configure postfix, so that authorized users can only send email through 465. By default this is not so. Users can also use STARTTLS over port 25. I would like to disable that.  My plan is to use port 25 for the public sending me email  use port 465 for my users (I can use firewall to allow specific IP ranges, or use custom port)  This would prevent port 25 being exploitable from brute force attacks, where hackers try to guess user/password. Port 25 simply would not accept user/password, even if it were valid. And since port 465 is restricted by firewall, hackers cannot exploit 465 either.  Is this possible in Postfix?  I am using Postfix 2.9.6-2 on Debian Wheezy


Let $S_0=[0,1]$ and define every $S_k$ for $k\geq 1$  \begin{align*} S_1&=\left[0,\frac{1}{3}\right]\cup\left[\frac{2}{3}, 1\right],\\ S_2&=\left[0,\frac{1}{9}\right]\cup\left[\frac{2}{9}, \frac{3}{9}\right]\cup\left[\frac{6}{9}, \frac{7}{9}\right]\cup\left[\frac{8}{9},1\right],\\ S_3&=\left[0, \frac{1}{27}\right]\cup\left[ \frac{2}{27}, \frac{3}{27}\right]\cup\left[ \frac{6}{27}, \frac{7}{27}\right]\cup\left[ \frac{8}{27}, \frac{9}{27}\right]\cup\left[ \frac{18}{27}, \frac{19}{27}\right]\cup\left[ \frac{20}{27}, \frac{21}{27}\right]\cup\left[ \frac{24}{25}, \frac{25}{27}\right]\cup\left[ \frac{26}{27},  1\right]\\ \vdots \end{align*}  Now let $C=\bigcap_{k=0}^\infty S_k$. This is known as a Cantor set.  I have to prove that C is non-empty, by showing that 1/4 is in C. I also have find the cardinal of C and prove my answer.   I have some ideas how to prove non-emptiness, but I am stuck as to how to specifically prove that 1/4 is in C. Also I think that the cardinal is equal to the cardinal of the reals $2^{\aleph_0}$. I probably need to find a bijection to prove this right?


Tricky elementary integral $\int_{0}^{\frac{\pi}{2}}x\cot(x)dx$.

$$\int_{0}^{\frac{\pi }{2}}x\cot(x)dx$$   I tried integration by parts and got $\dfrac{1}{2}\int_{0}^{\frac{\pi }{2}}x^{2} \csc^{2}x dx$ which doesn't help at all. I don't really know what to do. Any help will be greatly appreciated.


Eliminate \hbox badness in multiple verse-like environment

This is a question dealing with underfull \hbox badness when newlines are entered using \\.    \documentclass[12pt]{memoir} \usepackage{lipsum} \usepackage{polyglossia} % the multilingual support package  \setromanfont[Ligatures=TeX]{Linux Libertine O} \def\mverse{\ifhmode \par \fi    \goodbreak \addvspace{3ex} \refstepcounter{section}    \centerline{\textbf{Verse \arabic{section}}}\medskip}  \newenvironment{customtext}%   {\leftskip=1em \rightskip=1em }%   {\ifhmode \par \fi} \newcommand\mstyle[1]{\begin{customtext}\setlength{\parindent}{0pt}{\large     \textbf{#1}} \\     {\sffamily #1}\end{customtext}\medskip}  \begin{document}  \mverse \mstyle{This is a custom verse} \lipsum  The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog.  \mverse \mstyle{ This is verse 2 line 1\\ The is verse 2 line that is a long line in for one type of fonts and can be accommodated in a single line %adding a \\ at the end of line will cause hbox badness }  The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog. The old fox jumps over the lazy dog.  \end{document}   the mstyle macro can take more one than one line of verse separated by \\ and then correspondingly display in multiple languages. That's the intent. However this produces widespread underfull \hbox.   How can hbox badness be avoided in such cases? The discussion:  offered some insight that a multline environment may prevent it. I am unable to wrap them in a multline begin/end block. Are there alternatives?


Dev Console Debug Log Becoming Unreliable?

Has anyone else noticed that the Debug Logs in the Developer Console are becoming notoriously unreliable? I am finding that often when I run code through Execute Anonymous in the hopes of examining the resulting Debug Log, none is generated there, even if it shows up in Logs > Debug Logs. I have tried switching around my Workspace and some other strategies, but it seems really inconsistent as far as I am able to observe.  UPDATE  From what I can tell, the most reliable fix for this issue is to instantiate a Debug Log for the running User (Setup > Monitor > Logs > Debug Logs).


What are next steps when fsck reports "could not be repaired after 3 attempts"?

My Mac Book Pro 13.-" doesn´t get past the grey booting screen with the apple and the spinning wheel (The loading bar appears but when it´s done nothing happens)   I have 220 GB in one single Partition (Macintosh HD) and there is all my work my music and the only copy of ALL MY PHOTOS. I´m so stupid I don´t have a backup of anything but know I have an external HD with 300GB space. I would like to repair my HDD but more important I need to save my files but I don´t know how to do it in Disk Utility Mode. I read there is a Diskwarrior but I don´t know how to install it without booting the mac. Please help!!!  When I start on Single User mode and enter /sbin/fsck -fs this appears  Executing fsck_hfs (version diskdev_cmds-557-393)  Checking Journaled HFS Plus volume.  The volume name is Macintosh HD  Checking extents overflow file.  Checking catalog file  Incorrect number of thread records  (4, 23745)  Checking multi-linked files.  Checking catalog hierarchy  Invalid volume directory count (It should be 175703 instead of 175701) Checking extended attributes file.  Incorrect number of extended attributes (It should be 340062 instead of 340064)  Checking volume bitmap.  Checking volume information.  The volume Macintosh HD could not be repaired after 3 attempts.  *****The volume was modified *****   What are the next steps if fsck fails to repair a drive?


Prove that $2^n+3^n $ is never a perfect square

My attempt :  If $n$ is odd, then the square must be 2  (mod 3), which is not possible.  Hence $n =2m$  $2^{2m}+3^{2m}=(2^m+a)^2$  $a^2+2^{m+1}a=3^{2m}$  $a (a+2^{m+1})=3^{2m} $  By fundamental theorem of arithmetic,   $a=3^x $  $3^x +2^{m+1}=3^y $  $2^{m+1}=3^x (3^{y-x}-1) $  Which is not possible by Fundamental theorem of Arithmetic   Is there a better method? I even have a nagging feeling this is wrong as only once is the equality of powers of 2 and 3 $(n) $are used.


Synchronize object filter - outliner behavior with viewport selection

the new Blender 2.81 synchronize outliner object to viewport and vice versa feature is fantastic.  It matches up with behaviors in other 3D software like 3DS and Maya.  One question on its behavior to see if it can do this as well:  When the collections are collapsed or the object selected in the viewport is not in the outliner view, the object gets selected in the outliner but it's not brought into view in the outliner.   Is there a way to get the outliner to "jump" to the selected object - expanding and/or scrolling the outliner as needed?  Many thanks!


What's the best way to return a random line in a text file using C? It has to use the standard I/O library (<stdio.h>) because it's for Nintendo DS homebrew.  Clarifications:   Using a header in the file to store the number of lines won't work for what I want to do. I want it to be as random as possible (the best being if each line has an equal probability of being chosen as every other line.) The file will never change while the program is being run. (It's the DS, so no multi-tasking.)


How can I detect if the shell is controlled from SSH?

I want to detect from a shell script (more specifically .zshrc) if it is controlled through SSH. I tried the HOST variable but it's always the name of the computer which is running the shell. Can I access the hostname where the SSH session is coming from? Comparing the two would solve my problem.  Every time I log in there is a message stating the last login time and host:  Last login: Fri Mar 18 23:07:28 CET 2011 from max on pts/1 Last login: Fri Mar 18 23:11:56 2011 from max   This means the server has this information.


Is there any abelian group whose Schur multiplier is $\mathbb{Z}_p\times \mathbb{Z}_p$?

I am working at some problem related to non abelian exterior square $G\wedge G$ of a finite abelian group $G$. My question is that:     Is there any abelian group whose Schur multiplier is $\mathbb{Z}_p\times \mathbb{Z}_p$.   It is well known that Schur multiplier of $\mathbb{Z}_p\times \mathbb{Z}_p$ is $\mathbb{Z}_p$ and Schur multiplier of $\mathbb{Z}_p\times \mathbb{Z}_p\times \mathbb{Z}_p$ is $\mathbb{Z}_p\times \mathbb{Z}_p\times \mathbb{Z}_p$ itself. Then for which abelian group $G$, $M(G)$ will be isomorphic to $\mathbb{Z}_p\times \mathbb{Z}_p$?


How can I prove that $\frac{\sin\theta+ \tan\theta}{2}> \theta$ when $0 < \theta < \frac{\pi}{2}$

I don’t know how to do it without calculus, could someone help ? How do I prove it geometrically and/or algebraically ? EDIT: $0 < \theta < \frac{\pi}{2}$ My teacher never explained it. Someone tried explaining it to me with calculus, but I would appreciate a different explanation.


Is an Enchantment Creature also an Enchanted Creature? For example,  states      Whenever Spiteful Returned or enchanted creature attacks, defending player loses 2 life.   If I have Spiteful Returned and  on the battlefield - both cast as creatures, not bestowed - and attack with both, does the defender lose 2 life or 4 life? Nyxborn Eidolon is an Enchantment Creature, but it has no enchantments on it. Is it technically an enchanted creature?


How to create and use a library in C# in command line, without using Visual Studio IDE?

I am trying to understand how to create and use a library in C#. In a similar way of understanding it in C using GCC.   I want to only use the command line, and not use Visual Studio IDE.   How can I    Create a library, including   Writing the source file, where do I have to use namespace and if yes, do I have to choose the namespace representing the directories where the library file is in? Compiling it into a dll file?  Use the library's dll file in another C# program?


the algorithm speed for pairwise product computation

I'm working on finding the max pairwise product of an array algorithm as practice. I've been able to get it down to 2n comparisons, by finding the largest and second largest numbers in the array using two seperate for loops. I know i could get it down even farther if I sorted then compared.   In the algorithm below is it n comparisons? I only have 1 loop so I'm assuming it is. also, what would be the Big O number for this? Is it the same as the number of comparisons? I know that we remove any constants if there is a variable and take the largest degree of the problem [sorry for the unclear explanations of algorithms -I'm just beginning on this.  static int EvenFasterAlgorithm (int[] numbers) {         int maxNum1, maxNum2, index, index2;         maxNum1 = -1;         maxNum2 = -1;         index = -1;         index2 = -2;         System.out.println("the size is "+ numbers.length);         int k = numbers.length-1;          if(numbers.length > 1)         {         for(int i = 0; i < numbers.length; i++) {              if(numbers[i] > maxNum1 && i != index2) {                 maxNum1=numbers[i];                 index = i;              }              if(numbers[k] >= maxNum2 && k != index)             {                 maxNum2 = numbers[k];                 index2 = k;              }             k--;         }         return maxNum1*maxNum2;         }         else         {             return numbers[0];         }     }


center text along tikz path after a shift

I elaborated upon   to develop an example:  \documentclass[margin=1cm]{standalone} \usepackage{tikz}  \usetikzlibrary{decorations.text}  \begin{document}  \begin{tikzpicture}  \draw (0,0) ellipse (2cm and 1 cm); \path[    postaction={      decorate,      decoration={        text along path,        reverse path=true,        raise=-0.3cm,        %text align={left indent = {0.75\dimexpr\pgfdecoratedpathlength\relax}},        text={very long text}      }   } ] (0,0) ellipse (2cm and 1cm);  \end{tikzpicture}  \end{document}   The output is:    I would like to place the text on top of the ellipse. For this I uncomment this line:    text align={left indent = {0.75\dimexpr\pgfdecoratedpathlength\relax}},   The output is     What is left is to replace left with center. Unfortunately then the document does not compile. How to solve?


Detecting 2.4 GHz signals using oscilloscope

I have used a spectrum analyzer with an antenna to see packets at 2.4 GHz being transmitted from my transceiver successfully. There was a mode in the spectrum analyzer which helps you to take a look at the power vs time plot too.  I would like to know if it is possible to do the same thing as above using a Tektronix TDS2024B Digital Storage Oscilloscope. As far as what I have understood about oscilloscope is that we need to use probes to connect it to the boards but how do I use it to detect these wireless packets?  Please excuse this naïve question.


Explaining large sum transfer not consistent with monthly earnings

I am applying for a standard visitors UK visa this week. I have a good monthly income and stable employment. I had my brother in-law transfer a sum of money through my bank account to my mother (almost double my monthly income) two months ago, which I forwarded same day to her account and it's all reflected in my bank statement. I want to know if I need to explain this to the consular since the sum is not consistent with my monthly income. Thanks


Reference request for mathematical physics from an axiomatically rigorous perspective

Being a grad student in math, and a rather pedantic one indeed, I was unable to accept many of the things taught to me in undergrad physics courses.  I am now trying to learn the applications of geometry to string theory and the applications of probability theory, my main field, to statistical physics.  Are there other prominent interfaces between abstract math and theoretical physics?    Where can I find these topics explored in a way that would be accepted by a mathematician? (I.e. every object mentioned is a legitimate object or logical statement in ZFC, and every nontrivial claim is proven, no use of unproven conjectures for anything but motivation, and wherever necessary to actually talk about physics of the real world, assumptions that link mathematical ideas (which are merely logical symbols and sets) to what they intend to model are stated in logically precise ways.)  In other words I am looking for a "Bourbaki" approach to physics, and wouldn't mind if the book started even as pedantically as to say, for instance, what a physical unit represents in set theory.


Modelling a censored outcome (tobit) with correlated data (random effect) in R

I have a continuous outcome that I need to assume is right-censored, so I'm looking for a way to fit a tobit regression model, however, my data are from family pedigrees so I also have to account for non-independence of my observations in some way (say with a random effects term). Can anyone think of a way to achieve this in R?


Windows 7 low and critical battery levels cannot be set lower than 10%

How do I change the low and critical battery levels to below 10%? I understand that this is a reasonable limit for most portable computers, but what about those with large batteries? On my computer (which has two batteries) 10% is an hour of runtime and is therefore way too high.


How can I prove that $\log^k(n) = O(n^\epsilon)$? (for any $\epsilon > 0 $ and for any integer and positive $k$).  I tried to do it by - definition , and to prove that exists $c,n_0 > 0$ so that for any $n > n_0 $ exists: $c \cdot n^\epsilon > \log^k(n) $, but I don't have idea how to continue for this point.    I will be happy to listen ideas :).


If I want to add all of the members who belong to the supplemental group web_users to the apache group (as an additional supplemental group) can I just add web_users group to the apache group?  Or do I have to recurse through the members of web_users and do a usermod -G apache $USER on each one?


how to open adhaar card in adobe reader with singed validate

I am Indian and in small business of adhaar card and I can't open the singed PDF document in adobe reader in Ubuntu 12.04.3 LTS and there is no alternative that open PDF and validate the signature. So anybody tell me what to do and how to ?


I read such a algorithms to implement expmod computation in   #+begin_src ipython :session sicp :results output def expmod(base, exp, m):     # base case     if exp == 0: return 1     if evenp(exp):         return expmod(base, exp/2, m) ** 2 % m     else:         return base * expmod(base, exp-1, m) % m  def evenp(n):     return n % 2 == 0  print(expmod(2, 8, 7))  #+end_src   #+RESULTS:  : 4   The algorithms employed the principle that    (x % mod) ** 2 = x**2 % mod   How could prove it?


Does this video make sense?    I mean, can I really explain a "universe from nothing" is this simple manner?


I want to find running time of a program (not CPU time). I have written a c++ code as follows.  time_t start,end; time (&start); //code time (&end); double dif = difftime (end,start); cout << dif ;   I got a output for particular instance as 2. what does this means? How can I get more accurate measure for elapse time (wall clock time)


I have a table and figure that I need them to appear side-by-side. The figure appears in a higher position than the table. I need to align them so that their sizes are equivalent. This is the script and the output compared to what I need.  \documentclass[11pt,a4paper,english]{article} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage{babel} \usepackage[font=small,labelfont=bf]{caption} \usepackage{graphicx} \begin{document} \begin{minipage}{\textwidth} \begin{minipage}[b]{0.49\textwidth} \centering  \captionof{table}{Table} \begin{tabular}{ll} \hline\noalign{\smallskip} Item1 & Item2 \\ \noalign{\smallskip} \hline \noalign{\smallskip} C & 100  \\ B & 200  \\ C & 300 \\ \hline \end{tabular} \end{minipage} \hfill \begin{minipage}[b]{0.49\textwidth} \centering \includegraphics[width=0.5\textwidth]{venndiagram2} \captionof{figure}{Diagram.} \end{minipage} \end{minipage} \end{document}


Why python code shouldn't exceed 80 chars?

Hello Stackoverflow users, Why it is recommended to not exceed 80 chars in python code ? I feel like it's completely useless, but someone told me it was important for some reason, what are these reasons and is it really important ? Thank you in advance.


A fundamental question about charge and speed of a particle

Hi everybody and happy 2019. In my teaching sessions sometimes someone asks questions i cannot truly answer (although i have many arguments on it) and here's one that really puzzles me:     A massless (real) particle moves at $c$; now, since electric charge is always   associated with the presence of mass, if you move at $c$ you cannot   carry any electric charge, nevertheless you can still carry color charge, why?   I think that a more fundamental question for this would be to ask why if you are massless you actually must move at speed $c$ plus to understand the nature of the e.m. interaction and strong force one. Any help to give my student an answer that is not a labirynth of theorical burning hell?  The point here is not if charged massless particle can or cannot exist but if in principle this apply to all kind of charges (e.g. elecrtic, color, etc.) that is to say if the property of a filed of self-interaction is somehow necessarely linked to the property of having no mass (or alternatively spin 0)


Cannot login after update ubuntu 12.04 . ICEauthority error message

I left my computer on overnight and when I came to it this morning it offered to update (I'm on Ubuntu 12.04). So I updated and restarted, now when I want to login, I get the message:  Could not update ICE authority file /home/user/.ICEauthority   I'm getting this on all accounts. I can't see a way to get into the terminal to sort this out, as various threads I've found suggest. If I use Ctrl+Alt+T nothing happens. If I use Ctrl+F1then just go to a black screen.  I tried using an old live CD (Ubuntu 8.04) but couldn't get to terminal via that either.  I made usb stick to boot 12.04 from but I have no option to boot from usb on the computer (it has USB sockets, but it's an old desktop).It's only got CdROM/HDD/Network boot as options.  I can't burn a boot CD of 12.04 because the file is too big.  Can someone suggest a way to get to the terminal so I can fix this?


are the tense of the verbs true in each sentence?  1-I think Jimmy did his duty as other police officers do.(simple past+simple present is true?)   2-I think he did the right thing because he is a police officer (simple past+present is true?)


Do gravitational waves violate the information paradox?

I know when black holes collide, the remnant black hole has a lower mass than the sum of the original two masses. This is due to energy loss via gravitational wave emission.  Does this violate the information paradox? Does this mass come from inside the black holes? I’ve seen some explanations saying that it’s due to relativistic mass from the black holes moving, is this correct? Is this real mass loss? An explanation would be appreciated.


Are upvotes on competing posts counted per question or per answer for Sportsmanship?

The definition of the :     Up voted 100 competing answers   doesn't specify whether each upvote on competing answers to the same question counts towards this criteria, or if it's limited to one "point" per question no matter how many additional competing answers you upvote. Can someone explain how it works?


Check proof that if $a_{n+1} = \frac{1}{k}(a_n+\frac{k}{a_n})$ with $k>1$ and $a_1>0$, then $a_n\to\sqrt {\frac{k}{k-1}}$

Let $a_n$ be a Sequence such that $a_{n+1} = \frac{1}{k}(a_n+\frac{k}{a_n}), k>1, a_1>0$, show that $\{ a_n \}$ converges to $ \sqrt {\frac{k}{k-1}}$   My attempt  case 1: $a_{n+1}-a_n \leq 0 \\ \frac{1}{k}(a_n + \frac{k}{a_n})-a_n \leq 0 \\ a_n^2+k-ka_n^2 \leq 0 \\ a_n \geq \sqrt {\frac{k}{k-1}}$  Here sequence is decreasing and bounded below by $\sqrt {\frac{k}{k-1}}$. so $a_n$ is convergent  Case 2: if $a_{n+1} - a_n \geq 0,$ i get  $a_k \leq \sqrt {\frac{k}{k-1}}$  Here sequence is increasing and bounded above.  SO given sequence is convergent. Let the convergence limit be l, then $l=1/k (l+ k/l)$ gives given limit.  can you pls tell me is this correct approach?


I'm trying to install g++ (with gcc already installed) on my Red Hat Enterprise Linux 6.  I've tried the following:  $ yum install g++ $ yum install c++ $ yum install gcc-g++ $ yum install gcc-c++   and nothing gets installed. I've also tried:  $ yum search g++ $ yum search c++   No hits.  What's up?


Euler's theorem multiplicative inverse Z26

Euler's theorem get the inverse of 2 in Z26...~ i tried to solve it but the result is not correct: a=2,  φ (26) = 12, m=26 gcd(2,26)=21 multiplicative inverse of 2 = 1/2 2 * 1/2 = 1 gcd(2,26)=2 a^-1= a^11mod26=2^11mod26= 2046 mod 26= 20 a=2     a^-1=20 aa^-1= 220=40 when doing the verification, 40 mod 26 = 14 not 1... or for this group the Euler theorem is not applicable ?


I'm using Lyx, and adding a floating image always add a "Figure X" at the left of the image, I'd like to show this 'caption' (I don't know if is caption or not) under the image, how should I do? What should I add in preamble?


Multithreaded ruby program only uses 100% cpu

I'm using ruby-head and Debian wheezy x64. When I run a multithreaded ruby script, htop shows that it's using multiple cores visually with the bars at the top, and that it's using 100% CPU on the process list but it's only using 100% of the capacity of one core. I assume it's possible to have multiple cores running at 100% and this number seems too convenient to be bottle-necked by either the program logic or another hardware aspect. Is the OS limiting the amount of available instructions I'm using, if so how do I stop this?  EDIT more info:  When I mean visually using multiple cores e.g.: 47% core 1, 29% core 2, and 24% core 3. These percentages are constantly shifting up and down and to different sets of cores, but always collectively add up to 100%-102%. More than 3(/8 total) cores are being used, but any cores other than the three most burdened only utilize 2% or less capacity. I guess I should also mention this is a linode VPS.  EDIT:  Well it looks like I was reading promises that 2.0 would feature true parallel threads, and not actual release information. Time to switch to Jruby...


How to reconcile interest in two (somewhat related) disciplines

I have two separate in-depth interests in two academic fields.  One of them in pure math (PhD in probability, also interested in complex analysis and differential geometry).  The other one is in software/computer science systems (privacy, distributed systems, this is where my current day-job is). I do not want to spend my life having to give up one of them because I find both very interesting.  But apparently Morera once said that having very in-depth knowledge about a narrow field is better than superficial knowledge in several fields.  Is his advice correct?  Is it possible to make contributions in both areas?  I am currently 34 and in between early-career mid-career stage.  Thanks,


I am working on a project and there I am getting a value from input tag and then insert input value in a div and appending on screen with children element.  And What I want that when user click on children element then parent div would be removed and for this I'm using a function. That is working when I am using by default a section but when I append a section and then click on that's children where a function call like when user click on it's children parent section would be removed but my functionality not working.    $('#btn').click(function() {   var menuFieldName = $('#text').val();   $('.div').append('
' + menuFieldName + 'X
');   $('#text').val(''); });  $('.div .a span').on('click', function() {   $(this).parent().remove(); }); .a {   display: inline-block;   padding: 5px 35px 5px 10px;   position: relative;   background: #eee;   border-radius: 20px;   margin: 10px; }  .a span {   position: absolute;   top: 0;   right: 0;   background: #333;   color: #fff;   height: 28px;   width: 28px;   text-align: center;   line-height: 28px;   border-radius: 30px; }

Test X

  <input type="text" id="text"> <button id="btn">Add</button>


What is the formula of the finite population correction factor?

Is it (N-n)/N or (N-n)/(N-1)? Provided that they can be used interchangeably, why would you use one instead of the other?


I've heard lots of varying histories of the term "OK".    Is there any evidence of the true origin of the term?


Javascript decimal precision lose after converting from string to Number or ParseFloat

If I try to convert below value to Number or parseFloat, the decimal precision getting lose.   var tt = "1234.12345678912345"  console.log(tt);  var ss = Number(tt); console.log(ss);  var rr = parseFloat(tt); console.log(rr);  var ee = +(tt); console.log(ee);  var ww = tt * 1; console.log(ww);    Please check the code snippet.  Is there a way to convert a string to Number without losing decimal precision?


Trying to understand how TTYs and PTYs work in CentOS 6.5?

I started to dig into the whole Linux pty and tty hell. I'm trying to understand how it works here in Linux so I was reading quite a lot of articles that covered this topic.   So far I know:      TTYs are TERMINALS which are the last "secretary" to talk to kernel.    PTS are virtual terminals, that on the one end are connected to the TTY and on the other end are connected to the terminal-emulator (the one that we can for example open by clicking applications->system tools->terminal. or to ssh session(?). So ssh uses another pts.    That seems pretty clear to me because when I will do w in a shell on my system I get:  21:26:53 up 2 days, 11:35,  2 users,  load average: 0.11, 0.08, 0.08 USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT kris     tty1     :0               Thu09    2days 52:28   0.05s pam: gdm-passwo kris     pts/0    :0.0             21:18    0.00s  0.02s  0.01s w   The tty1 is a terminal session, which was started when I logged into my machine, and the pts/0 is a virtual terminal (instance of App -> System Tools -> Terminal).  However, what is the pty then? If I will connect to my server through ssh then another pts will be spawned, but when will another tty be spawned, and whats the point of pty, from the man pty it seems to me like it is this:   Emulated terminal (gui terminal) talks to pts This pts in turn talks to pty , which talks to tty   That doesn't make sense.  Please try to explain it using examples because it is very easy to fall off with all the differences between consoles, terminals, virtual terminals, emulated terminals, pts, pty, tty.


Show that the set of invertible $n\times n$ matrices with entries in $\mathbb{R}$ is not connected?

I think I need to work with the determinant of an arbitrary matrix from this family but am not sure.


How to prevent suspension when a program is currently running?

Is there any way to make Ubuntu 12.04 understand when it should suspend or not in terms of the software that is currently running?  For example, if I am installing something and it takes more than 10 minutes, which is the time limit for my PC to suspend, then I do not want my system to system to suspend till the installation of the program is finished. If my system is inactive I want it to suspend,but on the other hand if something is running I do not want to suspend.


com.google.android.trichromelibrary causes many Android apps to crash

Recently, apps that are fine an hour ago now crash when I open them. The crash report message seems to be caused by a null pointer exception (NPE) in com.google.android.trichromelibrary. Apps affected for me:  Gmail Dashlane  Is it just me, or is there actually something wrong with the library? How can I fix these affected apps? Crash report: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** Build fingerprint: 'Xiaomi/polaris/polaris:10/QKQ1.190828.002/20.9.4:user/release-keys' Revision: '0' ABI: 'arm64' Timestamp: ... pid: ..., tid: ..., name: com.dashlane >>> com.dashlane <<< uid: ... signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 Cause: null pointer dereference          ...  backtrace:     #00 pc 00000000038621f0 /data/app/ com.google.android.trichromelibrary 438909034-YaxP9ttrIDcQBfleP5vm7Q==/base.apk! libmonochrome_64.so (offset 0x646000) (BuildId: ... )  (click  for the screenshot of the bug report)


Software center and synaptics got broken somehow. I seem to have it fixed through sourses.list  but I'm getting errors when I run sudo apt-get update.  (Screenshot will be coming soon)


How to get the co-ordinates of an element after onclick event ? I need to place an overlay just below an icon that was clicked.  Is there any such built in function provided by Javascript rather than manually writing a function for that ?


Angle bracket over terms. "Vertical angle bracket"?

I am attempting to reproduce an existing typeset equation. I am unable to find an \overanglebracket command. Two instances illustrate what I hope to accomplish. Comment by @SebGlav leads me to \wedge and the stackengine and scalerel packages. \documentclass[11pt]{article} \usepackage[math-style=french]{unicode-math} \usepackage{stackengine} \usepackage{scalerel} \begin{document}  \[\widehat{AOB}\]  \[\stackon[2pt]{AOB}{\hstretch{3.75}{\wedge}}=θ-\frac{π}{2};\]  \[\stackon[2pt]{KCA}{\hstretch{3.75}{\wedge}}=2\stackon[2pt]{KOA}{\hstretch{3.75}{\wedge}}=2θ.\] \end{document}   and I obtain:   and


I eye-balled the chili and cayenne powder in my chili and have made it painful to eat. What should I use to counteract this? I tried adding pasta sauce and cheese to a small serving, but it wasn't very effective.  According to the question "" the heat is coming from capsaicin:     Capsaicin, the heat-producing compound in most types of hot peppers,   is the highest on the Scoville Scale; extremely piquant and can   produce a "burning" sensation in very small quantities. It is also   poorly soluble in water, but is far more soluble in fat, especially   oils. Adding some olive oil or a good quantity of butter to your   recipe is a good bet for reducing capsaicin/capsicum heat.   From some various discussions on the internet, I've also heard dark chocolate and sour cream can be effective.  What can I add in minimal quantities without affecting the taste drastically?


I have read about a strange fact that fire has no shadow. I am wondering why.  Is it because of the fact that the constituent particles of fire have tremendous amount of speeds ?


My physics textbook states an activity- "Cut out thin strips of paper and lightly iron them. Take them near a TV screen or computer monitor. The strips get attracted to the screen and may cling to the screen for a while." But this doesn't happen in practice. Is this because I did the activity with an lcd screen. Will a crt/led/plasma screen make it happen? If so, why? Why should the paper strips be ironed?


How do I Calculate the components of a unit vector that lies in the xy-plane and makes equal angles .....

Calculate the components of a unit vector that lies in the xy-plane and makes equal angles with the positive directions of the x- and y-axes


Additional visa needed to travel to Belarus with Russian visa for EU citizen?

I am a German citizen currently living in Russia with a Russian study visa. I am planning on driving to Minsk with a car and from there to Poland. Since I already have a visa for Russia, is a special visa required for Belarus? I am aware of  but my question differs in the respect that I am not an US, but a EU citizen and that I am not entering Belarus by plane or train.


Automatically include a sequence of images

I want to include a sequence of images in Beamer (although it can be in another type of document). Something similar to the option Photo Album in LibreOffice and MS PowerPoint.  What I did is to make a template (that I can modify):  %s \begin{frame}     \frametitle{%s}     \framesubtitle{%s}     \centering     \includegraphics[width=0.9\textwidth]{%s}  \end{frame}   And then I use a Python script to generate the code for each frame, like this:  tex_file = open(filename + '.tex', 'a+') for name in list_files:     print >> tex_file, s1 %(comment, title, subtitle, name)  tex_file.close()   After that I just use an \include in my main file to add the sequence of images.   My question: Is there a package for this task? or a better way to do it?


How to find the version of Gnome in my current Ubuntu 16.04 os via terminal?

I wanted to check the version of my desktop environment which is currently Gnome. And l would love to know that from command line. How can l do that?


Prove $\lim_{n\to \infty} n\int_0^1x^nf(x) \,\text dx=0 $

Assume $f(x)$ is continuous on $[0,1]$ , and $f(1)=0$. Prove $$\lim_{n\to \infty} n\int_0^1x^nf(x)\,\text dx=0 $$  I already know that $\lim_{n\to \infty}\int_0^1x^nf(x) \, \text dx=0$. Is this helpful in the question above?


Are these subsets of the powerset P(N) countable?

I am only a first semester undergraduate (of mathematics) so I would appreciate the answers to not be too complicated. Also English is not my first language, so my explanations might be a little off.    While trying to prove that the Powerset $\mathcal{P}(\mathbb{N})$ is uncountable I ran into something that I wasn't able to understand.  So, I define the set $$ \mathbb{N}_n=\{\{a_1,a_2,\ldots,a_n\}:a_i\in \mathbb{N} \; \forall i \text{ and } a_i \neq a_j \; \forall i \neq j\} \text{ for } n \in \mathbb{N} $$ basically the set goes like this $$ \mathbb{N}_0=\{ \emptyset \} \\ \mathbb{N}_1=\{ \{1\},\{2\},\{3\},\ldots \} \\ \mathbb{N}_2=\{ \{1,2\},\{1,3\},\{2,3\},\{1,4\},\ldots \} \\ \vdots $$ and we can conclude that $$ \text{if } \mathbb{N}_i \cap \mathbb{N}_j = \emptyset \text{ then } i \neq j \\ \bigcup\limits_{i \in \mathbb{N} \cup \{0\}} \mathbb{N}_i = \mathcal{P}(\mathbb{N}) $$ Okay, so there are a countable number of sets $\mathbb{N}_i$. Also the set $\mathcal{P}(\mathbb{N})$ is uncountable. Also as briefly mentioned in yesterdays lecture (at my university), a countably infinite union of countable sets is a countable set. From this I have concluded that:  $ \text{There exists an } i \in \mathbb{N} \text{ such that the set } \mathbb{N}_i \text{ is uncountable.} $  Now, there is the possibility of a mistake that I have made in a previous statement. But in the case that I haven't, this last statement seems very counter intuitive to me. I have also tried proving / disproving it but failed.  My question is where have I either made a mistake, or if I haven't how do I prove or disprove my final statement.


Align text in exact center (vertically and horizontally) without creating outlines?

In Illustrator, how do you align text in the exact center of a shape for example without creating outlines. If I go to center text using the align palette, Illustrator aligns the text to it's bounding box.  I know you can create outlines, but I want the text to remain editable in case I need to make changes later.  Any thoughts?


Buffering point with different distance toward N, E, S, W using ArcGIS for Desktop?

I want to create buffer polygon(with curved edges) from  points like this using ArcGIS for Desktop.   distance toward North from a point 5, toward South 1.5, toward west 1, toward East 2.   all this distance is attached as attribute in point in different fields.


Can a grappled creature grapple back to prevent being moved?

Let's say that Andre (the Hill Giant) and Conan (the Barbarian) are fighting.  Andre attacks Conan and manages to successfully grapple him.  He then drags Conan 20 ft (half speed) toward the Bad Place where Conan doesn't want to be.  On Conan's turn, can he use one of his attacks to grapple Andre so that Andre's speed will now be 0?  (It seems that he could shove the giant away, but maybe he is being heroic in some way.)  This seems to prevent Andre from continuing the drag unless Andre spends his action to break Conan's grapple (while maintaining his grapple).  How does Conan being prone change this?


Given name marked as FNU on old passport but given on new passport, is this a problem for a valid US visa?

My mom’s old passport has only a Surname and no Given Name. The USA Visa was also issued this way.   Example:   Surname: Lakshmi Vishnu Given Name: FNU   My mom’s new passport has changed the way the information is structured.  Example:   Surname: Vishnu Given Name: Lakshmi   The old visa is still Valid and she is visiting me next month. She has traveled to the US before.  Will this change of surname and given name pose a problem?


Triangle law of vector addition for parallel vectors

It says in my textbook that we cannot use the parallelogram law of addition for two parallel vectors, but the triangle law always applies, I didn't get this at all. How does the triangle law apply if two vectors, or two sides of the triangle, are parallel to each other? And if you guys say that it is a duplicate of any other question, then please explain why.


How do I change my default account with Google multiple sign-in?

After I enable multiple sign-in, and login to multiple accounts, I see that one of them says "(Default)". How do I change which of the accounts is the default one?


in SQL Server specifically, is it better to use a money column or a decimal column for currency values ?

For the currency values, I am doing all the calculations in the business layer of ASP.net website so is there even a need to store in sql server as a money column ?


How do I make a fully statically linked .exe with Visual Studio Express 2005?

My current preferred C++ environment is the free and largely excellent Microsoft Visual Studio 2005 Express edition. From time to time I have sent release .exe files to other people with pleasing results. However recently I made the disturbing discovery that the pleasing results were based on more luck that I would like. Attempting to run one of these programs on an old (2001 vintage, not scrupulously updated) XP box gave me nothing but a nasty "System cannot run x.exe" (or similar) message.  Some googling revealed that with this toolset, even specifying static linking results in a simple hello-world.exe actually relying on extra .dll files (msvcm80.dll etc.). An incredibly elaborate version scheming system (manifest files anyone?) then will not let the .exe run without exactly the right .dll versions. I don't want or need this stuff, I just want an old fashioned self contained .exe that does nothing but lowest common denominator Win32 operations and runs on any old win32 OS.  Does anyone know if its possible to do what I want to do with my existing toolset ?  Thank you.


A native English speaker said to her students that "I and my wife have ..." is wrong & we have to say   "My wife and I have ..."  Why did she say it's wrong?


Consider 9 random and distinct real numbers. Prove that there exist at least 2 of them, $m$ and $n$, for which $0 < \frac{m-n}{1+mn} < \sqrt{2}-1$.   Any ideas? I really don't know where to start from!  The friend who challenged me with this problem claims that it can be solved by using pigeonhole principle, but I have no idea how!!


I have data set with date features like 01/01/2019 and I would like to use KNN. However, I cannot find a good transformation for dates that has a meaningful distance result for the last feature.  For example:  f1 | 1 | 2 | 3 | 4 | 01/01/2019  f2 | 10 | 3 | 12 | 1 | 14/01/2019  Does anyone have any recommendations?


Create WiFi hotspot with web access point

I want to setup a WiFi network with access through a web interface. Essentially people would be asked to enter a username/password and their session would be valid for X minutes after which they'd be logged out.  I am capable of quite a few programming/scripting languages, but browsing through router settings I don't see how to/where hosted/etc. the web interface/session handling comes in.  Please push me the right direction.


JavaScript for..in statement give unexpected results in IE8

I have an object which would translate into a Dictionary in C# and I'm trying to loop through all my "keys" so that I can draw my objects in order.  Let's say that this dictionary contains three objects with the keys 1, 2 and 3.  for (var key in myDictionary) {     if (key === "indexOf" || key === "length")         continue;     // Do stuff... }   Now, in IE9+, Chrome and Firefox, the output will be 1, 2, 3 while in IE8 the output is 2, 1, 3. As it is crucial for my application that these objects are given in order you can understand that this is unwanted behavior.  My question, therefore, is: Why does this happen and is there a known workaround that fixes my issue?


I am not native English speaker. I get frustrated when it come to articles. Can you please tell me whether the sentence below is grammatically correct.  She spent all the night in rereading a letter from her sister


How can a flag be helpful without any action taken?

I flagged  to be duplicate of  and my report was marked as helpful:    But I do not see any action taken. I suppose the duplicate question should be closed. Then how is the flagged question still open if my report was helpful?


I have a 320 GB HDD, and I want to migrate my Ubuntu system to a 60 GB SSD I bought.  I have an ext4 root partition and a swap partition. The root partition has 314 GB, but my files take up 50 GB, the rest is free space, so my partition is larger than the SSD, but my files can fit in it.  I have already partitioned the SSD with a 54 GB ext4 partition and a swap partition, now I only need to move my files to it.  What is the best approach here - using cp, dd, gparted, or something else?


I'm an undergraduate mathematics student finishing my degree.  I plan to go to grad school, and ultimately aspire to become a professor.  I really like tattoos, but I'm hesitant to get one because it could affect my future job.  Of course, if I did get one, it would be discrete and innocent.  What I really want is the axioms from ZFC wrapped around my upper arm.  I'm very interested in hearing people's thoughts on tattoos in the workplace, particularly from people who work in mathematics.  Do you think it is acceptable?  How would you judge someone based on their tattoos?  Do any of you have tattoos?  What are your experiences?


Isn't Inactive memory a waste of resources?

I'm looking for explanation of memory usage on my machine especially in light of the example in this screenshot below:    I understand what is Free and Active means But what are the meanings of Wired and Inactive?  Especially inactive, why does it use so much memory for something that we do not use?


Could someone have negative reputation on Stack Overflow?

Imagine I'm new to Stack Overflow and I create a new question that receives 10 downvotes. That means I should lose 10 x 2 reputation points.  Since a user starts with 1 rep on Stack Overflow, I understand I would have -19 rep. Is this so, or can a user's reputation never go below 0?


(Duplicate) I'm solving some questions in discrete mathematics, and I stuck with this problem.  Prove that there are uncountably many non-isomorphic linear orderings in N.


I want to install Ubuntu 14.04 on my new laptop, but when I download 64 bit desktop version. from Ubuntu site the ISO file is "ubuntu-14.04-desktop-amd64", is that OK? I have Intel i-7 processor.


pygtk not available on Focal Fossa (20.04)?

tl;dr I cannot install pygtk on Focal Fossa (Ubuntu 20.04) anymore but need it for my self-written PyGTK-based Python application.  I wrote a Python2 application some years ago based on GTK using the pygtk package.  This worked fine for years now, I could always use the available Python2 installations, even when Python3 was the more modern variant.  With Focal Fossa (Ubuntu 20.04) Python2 support has been dropped, so I thought, no problem, I can upgrade my application to Python3.  After doing it, I tried to install pygtk for Python3 using sudo pip3 install pygtk but this failed:  $ sudo pip3 install pygtk Collecting pygtk   Using cached pygtk-2.24.0.tar.bz2 (2.4 MB)     ERROR: Command errored out with exit status 1:      command: /usr/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-nezwkvr_/pygtk/setup.py'"'"'; __file__='"'"'/tmp/pip-install-nezwkvr_/pygtk/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-nezwkvr_/pygtk/pip-egg-info          cwd: /tmp/pip-install-nezwkvr_/pygtk/     Complete output (4 lines):     ********************************************************************     * Building PyGTK using distutils is only supported on windows. *     * To build PyGTK in a supported way, read the INSTALL file.    *     ********************************************************************     ---------------------------------------- ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.   (The mentioned pygtk-2.24.0.tar.bz2 file wasn't to be found anymore, so I could not even look at the INSTALL file as suggested.)  I also found no package for apt install ... that would have installed it.  Alright, I thought, back to Python2.  But unfortunately I cannot install pygtk for Python2 as well.  I can install a python2 package, but there is no pip command and/or module anymore for Python2.  (So neither pip ... nor pip2 ... nor python2 -m pip work.  Maybe I just didn't find the correct way to do it.)  So I also could not install the Python2 version.  Then I briefly tried looking up how to install a non-packaged version of pygtk but that quickly dove even deeper into more dependencies (jhinstall, etc.) which seemed like taking even more time, and I'm lacking the experience in solving all these.  So I guessed maybe there is an easier solution and maybe someone here knows how to easily solve this issue.  If nothing here pops up I will have to invest the time and solve the dependencies the hard way.


Prove that if a product$ AB$ of $n\times n$ matrices is invertible, so are the factors $A$ and $B$.

I'm really struggling with "simple" proofs, and I could only come up with this. I googled for the solution and know how to do it now, but I first want to know if there's anything wrong with my solution? $$ (AB)^{-1}=B^{-1}*A^{-1}. $$ For this equation to hold, $B$ must be invertible and so must $A$. //


If I sleep in one bed, then in a separate bed and then remove it, what will happen to my spawn?

As the title suggests, if I have one bed set up in my base, then go adventuring and bring a bed with me, will my spawn change back to the original bed location each time I pick up the bed I just slept in?


How can I remove all symbolic links with a special target?

With the command:  ls -la *   I can list all my symbolic links.   How can I remove all symbolic links which are linked to a special folder?  For example:  In my directory usr/local/bin I have the following entries:  lrwxrwxrwx 1 root root 50 Apr 22 14:52 allneeded -> /usr/local/texlive/2011/bin/x86_64-linux/allneeded lrwxrwxrwx 1 root root 47 Apr 22 14:52 amstex -> /usr/local/texlive/2011/bin/x86_64-linux/amstex lrwxrwxrwx 1 root root 24 Apr 23 19:09 arara -> /home/marco/.arara/arara   Now I want to remove all links with the path /usr/local/texlive/


A formal consequence of Krull's principal ideal theorem is the following:  If $A$ is a Noetherian ring, and $I$ is an ideal generated by $r$ elements, then any prime ideal which is minimal among those that contain $I$ has height at most $r$.  This statement implies that for Noetherian rings, principal prime ideals have height at most $1$.   My question is if this is true for any ring, i.e., is a principal prime ideal of a ring always of height at most $1$?  The above question is clearly true if the following statement is true: If every maximal ideal of a ring is finitely generated, then the ring is Noetherian. (Note that this statement is true if we replace maximal ideals by prime ideals)   However, I am not sure if this latter assertion is true, although I do not have a counterexample for it.


Why are emitters colored black better emitters than other colors?  Why is white a worse emitter?


How are the first mods chosen for brand new stack sites?

I've recently started following and participating in some Area 51 stack sites and one is currently in the commit phase. It wasn't inherently obvious who will be moderating it and how those people are chosen.   What is the process for selecting the first moderators for new sites?


In C++11, dow can I reference an enum class defined inside a template argument

Here is a simplified version of the code I am trying to write:  template<typename Derived> class StateMachine { public:   void SetState(Derived::State s) {     static_cast<Derived*>(this)->TransitionTo(s);   } };  class MyFSM : public StateMachine<MyFSM> { public:   enum class State {     State1,     State2,     State3   };   void TransitionTo(State s) {     _state = s;   } private:   State _state = State::State1;   };   I'm using c++11 with clang. The error I get here is 10:17: error: missing 'typename' prior to dependent type name 'Derived::State' for the declaration of SetState. I've also tried adding typename Derived::State DerivedState; and then using DerivedState instead of Derived::State, but then I get error: unknown type name 'DerivedState'.  More confusing still, I tried typedef typename Derived::State DerivedState; and then I get the error: error: no type named 'State' in 'MyFSM'. my last try was typedef enum class Derived::State DerivedState; and then I get the most confusing error of all: error: no enum named 'State' in 'MyFSM'.  I'm out of my depth with templates here and would welcome any help understanding this! Also, there may be a better pattern to use here. The main thing I'm going for is that the StateMachine class has some common functionality and then there are a bunch of different state machines, each with their own state and transition function. I have another way of doing it that requires passing in this to SetState (when called from within MyFSM, which is a simplified version of what I'm doing), but that's ugly for it's own reason. I'd love to avoid this tempalted class thing, but my main goal is making the derived classes as easy to write and understand as possible.


How to open the ports on firewall in Ubuntu?

I'm pretty new to Ubuntu. I just want to open the most common ports namely   FTP (port 20 TCP/UDP) HTTP (port 80 TCP/UDP) SMTP (port 25 TCP) ETC   I've tried all the ways in iptables, ufw, and gufw.  In the end, it still remains unchanged with the same error:  Connection refused.  I can't even access the home page on HTTP port: 80 from the other device.


If $\gcd(a,b) = 1$ and $a,b\mid x$ then $ab\mid x$.  My attempt at answering the question:  \begin{align*} x &\equiv 0 \pmod{a}\\\ &\Longrightarrow x\text{ is divisible by $a$}\\\ &\Longrightarrow x = ma\text{ for some integer $m$}\\\ \ \\\ x &\equiv 0 \pmod{b}\\\ &\Longrightarrow  x\text{ is divisible by $b$}\\\ &\Longrightarrow x = mb\text{ for some integer $m$}\\\ \ \\\ x^2 &= (ma)(mb)\\\ x^2 &= (m^2)(ab)\\\ x &= \sqrt{m^2ab}\\\ x &= m\sqrt{a}\sqrt{b} \end{align*} Let $m$ be $k\sqrt{a}\sqrt{b}$. Then \begin{align*} x &= kab\\\ &\Longrightarrow x \equiv 0 \pmod{ab} \end{align*}  Is this correct, if not can someone point me in the right direction?


I want to edit the \leftmark so it just displays the number and the title of the chapter.  I have shown a minimal example of my document below. Instead of “Chapter 1. The first chapter”, I just want the \leftmark command to show: “1. The first chapter”.  How do I solve this ?   \documentclass[10pt,a4paper]{report} \usepackage[utf8]{inputenc} \usepackage[english]{babel} \usepackage{lmodern} \usepackage{fancyhdr} \usepackage{lipsum}  \fancypagestyle{Mainstyle}{% \pagenumbering{arabic} \setcounter{page}{1} \fancyhead[R]{\leftmark} \fancyhead[L]{Something} \fancyfoot[C]{\thepage} \renewcommand{\headrulewidth}{1pt} \renewcommand{\footrulewidth}{0pt}  \fancypagestyle{plain}{% \renewcommand{\headrulewidth}{0pt} \fancyhead[L]{} \fancyhead[R]{} \fancyfoot[C]{\thepage}} } \begin{document} \pagestyle{Mainstyle} \chapter{The first chapter} \lipsum[2-4] \section{The first section in first chapter} \lipsum[2-4] \section{The second section in first chapter} \lipsum[2]  \chapter{The second chapter} \lipsum[2-4] \section{The first section in second chapter} \lipsum[2-4] \section{The second section in second chapter} \lipsum[2] \end{document}


Wipe Windows 8 and replace it with Ubuntu

I have a HP laptop with pre installed Windows 8, only about 12 months old, I hate it and now something has gone wrong with it and it wont reset as it says the files are missing, I have gone over to using Chromebook now, but want to use the laptop for something, how do I remove Windows and install Ubuntu in its place? I tried to install already but it won't disable the safe boot function. I'm not all that knowledgeable, but will give it a go as not much to lose as the damn thing is unusable now.


What is the precise difference between the Mean, Average and Expectation ? Is there any mathematical formaulation to show the difference ? I see that often they are used interchangeably.


If someone's so lazy they use an auto-generated username, they may not have done email verification. What are the chances that they'll ever return?

New visitors to Stack Exchange can post questions or answers as a guest.  The site asks them to specify their name and their email address.  If they're lazy and they leave the "name" field blank, the site will auto-generate a display name for them, such as "user9276583".  Email verification is a separate step.  They must take additional actions in order to get an verification email sent to them.  Then they must open the email and click the link.  If a guest is so lazy that they didn't specify a display name, I think it's reasonable for me to fear that they might also have been so lazy that they never completed email verification.  Still, I might be tempted to ask in a comment in order to seek clarification of their tech-support question.  In practice, if a user is 100% brand-new to the Stack Exchange network, and if they have an auto-generated display name, what are the chances that they'll ever be back again to respond to my comment?


Why does no one in the Hunger Games have to travel to attend the Reaping?

Reading the Hunger Games books and watching the movies, I have noticed that everyone in Panem's districts seems to live in the same general area. Everyone in District 12 knows everyone; there is no mention of people having to travel to a central city in the district in order for the Reaping to be conducted.   This seems strange, considering that the districts are all rather large. Yes, the war nearly a century ago decimated the population, and yes, famine has been a problem. But is it realistic to expect everyone living in a large district to live in the same central area?   Could the population in the districts other than 12 be more spread out, requiring Reaping procedures to be different? Or are all districts like 12, with the entire population apparently living in only one small central area?  Would Reaping procedures have to be more complicated than the books suggest?


an unknown acount is created on my CPanel server

I just installed CPanel on my server and after a few hours I received notification of a new account called "karukradi"  does anyone know whats this?


I have to show that   $F_{n+k} = F_{k}F_{n+1} + F_{k-1}F_{n}$, where $F_{n}$ is nth Fibonacci element.  I was trying with mathematical induction applied to n and saying k is constant.   step for $n=1$ $F_{k+1} = F_{k}F_{2} + F_{k-1}F_{1}$ which is true, because $F_1=F_2=1$ step let say our theorem is true for some n step  I was trying to do it like this: $F_{n+1+k} = F_{n+k}+F_{n+k-1} = F_{k}F_{n+1} + F_{k-1}F_{n} + F_{n+k-1}$   but there is $F_{n+k-1}$and I do not know what to do with it.  Thanks!


What is a word for guy who is popular with the ladies?

I can't think of another word other than 'ladies man'


Weird HyperV Ethernet in Taskmanager after Version 20H2 update

today I noticed in my Taskmanager some new entries of HyperV Virtual Network. I never turned Hyper V on, that entry is still on "off" in the Windows Features List, and I dont use any virtual machines or vpns. I think it might be because of the newest big Windows Update 20H2, or maybe even a virus. What do you think? Thank you in advance.   Edit: To clarify I never used any Virtual Maschines or HyperV, so its a little scary to see it pop up from itself


What happens if a person can't die of a heart attack?

What would happen if a person wasn't able to die of a heart attack since they use a pacemaker or are connected to medical equipment that pumps blood for them?  This can create some sub-questions, if people couldn't die of a heart attack such as:   What would happen if the cause of death specified was impossible, so the person had to die of a heart attack? What would happen if no cause of death was specified?


Waiting 60 seconds every time I make a mistake when posting a question is a pain

Waiting 60 seconds every time I make a mistake when posting a question with the Android app is a pain. Couldn't this delay be lowered to some more user-friendly delay?        (mistake = e.g. forgetting a compulsory tag)


Rendered aspect ratio different from the viewport's camera view

Why would there be a difference in aspect ratio between a rendered image, and the camera perspective in the viewport? My render is getting squashed to fit a different aspect ratio.  Here is a scene with a circle and emission shader.  Camera perspective in the viewport:   Render:


Fetch as Google says my page is "Temporary Unreachable"

When looking into it in WebmasterTools, I saw that there is a "Fetch as Google - Temporarily Unreachable Issue". It is for an image, and font.  How do I resolve this issue?


Calendar (notification panel) in the Arc-Black shell theme is unreadable

Since I renamed my home folder I've gotten many bugs including the following one where the calendar in my Arc-Black theme appears to be white and unreadable, also, you have the Themes I'm using right now in the Tweeks screenshot down below


How are self-replicating mines supposed to work?

Standard replicators are able to replicate mundane materials and smaller not-too-complex machines. At one point, under the influence of a Cardassian anti-riot program, the replicators in DS9 are magically able to produce something like a self-targetting automatic phaser gun.  Normally, for more complex tasks, such as "building a powerplant" or "making major parts of a starship", very special and rare "industrial" replicators are needed. Apparently, an entire planet normally doesn't have more than half a dozen of these, and they are valuable enough for super secret security measures so the Maquis won't steal them (which they do anyway).   In either case, replication is the process of turning energy into matter.  In addition to their main power supply and thrust, the self-replicating mines contain a standard photon torpedo warhead, which means that they are able to release a considerable amount of energy (which is "gone" after the explosion) from a matter/antimatter reaction. The energy, and of course the antimatter must come from somewhere (regardless of the energy needed, can a replicator replicate antimatter at all?).  It seems improbable (if not impossible) that self-replicating mines could work at all. If you were able to replicate an energy cell containing the same amount of energy as the original one plus a considerable amount of matter/antimatter plus some other stuff, like a cloaking device then you would have the most perfect perpetuum mobile imaginable.


Marketing Cloud contact builder shows 9 times more contacts

We synced contacts from Salesforce to Marketing Cloud.  Data sources and it's related entities display 118,704 contacts got synced from Salesforce.   But in Contact builder it is showing 9,34,276 contacts.   We are assuming of possible duplicates. Attched are the screenshots for reference. How do we know the source of sync of 9L contacts?


Am I required to pay UK/ USA Visa fees if I have a German residence permit?

Here is the situation. I am non-european but staying in Germany with a Residence permit. I can visit all Schengen listed countries with no issue. Assuming that I would want to travel to a non-Schengen country e.g. UK or USA, can I use my residence permit to travel there or am I required to apply as a citizen of my country? Assuming Germans are not required to pay Visa fees to that country, will I have to pay since I only have a residence permit? Third case, Europeans can fly directly to the airport of some countries and apply for a visa from there. In some other countries, you are required to book a Visa appointment at the embassy, which may be granted or not. Does that apply for one with a residence permit?


Is Object memory freed when we explicitly call finalize() on it?

As far as my understanding goes finalize() and GC are two different aspects. GC uses finalize() method to free Object memory. We cannot state when GC will occur(even if we explicitly call System.gc()). But we can explicitly call finalize() on an Object.  Will the function be executed immediately(memory freed) or it waits till GC occurs like System.gc() call?   Also as per the docs the finalize method is never invoked more than once by a Java virtual machine for any given object.  So what happens when we call finalize() first and GC happens at a later point of time.   If object memory is not freed on explicit call to object.finalize() then would't  it being called again in the GC process violate the calling only once rule?


How do I map Linux Kernels to Ubuntu Kernels?

Ubuntu Kernels and Linux Kernels have different numbers With the recent Meltdown and Spectre security holes I've been reading on new releases of the Linux Kernel. How do I translate the latest Linux Kernel version number, say 4.15.5 to corresponding Ubuntu Kernel version numbers?


ArrayList returning as null, not sure why

I'm writing a program that will take a text file and determine how many times each word is used in the text file, forming a condensed list. The parameters require me to use two separate classes, as so...  My problem is that nothing is ever added to my Frequency ArrayList, and I can't figure out why exactly. Any help would be much appreciated.  import java.io.File; import java.util.Scanner; import java.util.ArrayList; import java.io.FileNotFoundException;  class FrequencyCounter {    ArrayList<String> unique;   ArrayList<Frequency> frequencies;    public FrequencyCounter(String file) {     unique = new ArrayList<String>();     frequencies = new ArrayList<Frequency>();      try {       Scanner input = new Scanner(new File(file));       while (input.hasNextLine()) {         String[] words = input.nextLine().split(" ");         for (String word : words) {         // For every word in the line...           for (Frequency f : frequencies) { // Check every frequency for that word...             if (f.getWord() == word) {      // If the Frequency already exists...               f.increment();                // Increment the specific Frequency's counter by one...             }else{               frequencies.add(new Frequency (word)); // If no Frequency has this word, make a new one...             }           } // End of Frequency for loop         } // End of String (word) for loop       } // End of .hasNextLine() while loop     }catch (FileNotFoundException e){       e.printStackTrace();     }   }    public static void main(String[] args) {     FrequencyCounter counter = new FrequencyCounter("sample.txt");   } }  class Frequency {    private String word;   private int counter;    public Frequency(String word) {     this.word = word;     counter = 1;   }    public void increment()  { counter++; };   public int getCounter() { return this.counter; }   public String getWord() { return this.word; } }


How does the energy in a standing wave travel beyond a node?

In a standing wave, how does energy travel past a node?  It should just get reflected. Assume the case of first overtone and you strike the string at a place. How will energy distribute itself?  If it distributes over the whole string, then how is it the wave traveled past a node?  Basically the problem is a standing wave has been set up in the string . Now you strike the string at a place, and this creates a new pulse. Now this pulse will travel past the next node in the string (not the boundary) or will it reflect off even that node and remain confined to a particular region of the string?


Are there any precise rules for dueling?

In The Chamber of Secrets, a dueling club is formed. But we don't really know if there is precise rules on it, except from initial salutation.  Does a precise rules list exist?


I'm trying to disable RST so I can install ubuntu alongside win10, but win10 keeps reverting my changes. What can I do?

When using this official guide (), windows reverts my changes once I reboot. I have also tried the following, which I have seen on multiple sites: Click the Start Button and type cmd Right-click the result and select Run as administrator Type this command and press ENTER: bcdedit /set {current} safeboot minimal (ALT: bcdedit /set safeboot minimal) Restart the computer and enter BIOS Setup Change the SATA Operation mode to AHCI from either IDE or RAID Save changes and exit Setup and Windows will automatically boot to Safe Mode. Right-click the Windows Start Menu once more. Choose Command Prompt (Admin). Type this command and press ENTER: bcdedit /deletevalue {current} safeboot (ALT: bcdedit /deletevalue safeboot) Reboot once more and Windows will automatically start with AHCI drivers enabled.  (source for this particular copypaste: ) However, when I reboot after turning off safe boot, win10 reverts to using RSI, taking the UEFI with it. I am using a new Medion Erazer P17613, secure boot/fast startup are turned off. I plan Ubuntu to be my primary os and to only have to boot into windows if I need it for uni work and can't get it to work in virtualbox, so a solution which involves me having to go into UEFI to switch os would be workable, although not optimal. edit: I don't know why askubuntu keeps telling me it's a duplicate, because the question it's referring to does NOT have it constantly revert, which I put in the title and the first paragraph... Anyway. Uni's started, so I don't have any more time. I'm nuking Windows and just running it in VM. this edit is mostly to explain why I won't be checking the thread any more. thanks anyway. Editing again, because, um - it wasn't actually Windows all along. I had some issues with the installation (the third-party software bug) and then RST turned itself back on (?!) so I was looking into secure boot again, found , went to try it and noticed another secure boot option in the security tab which wasn't the one I had found previously, tried it out of curiosity, and it worked. just for the record: I did not actually need to do the supervisor password thing. I don't know if it's only this one or also the other secure boot required to be turned off, but. I apologise for my assumption that it was Windows causing the issue, that probably didn't help anything. for anyone else with this problem, the wording may not be as obvious as you think it should be (I'm incredibly literal) so search everything even slightly security-related. edit again, trying to reinstall just to be sure, and RST is back on?! v apologies for the below being slightly lengthy. I don't want to be the 'found a solution but didn't post it' person, and I'm typing this as I go. edit for hopefully the final time: I got past the point where it would tell me RST is enabled by switching the boot order to boot from the USB before anything else, and also turned RST off again while I was in the bios at that point. this gave as little time as possible between disabling RST and installing from USB. I ended up in initramfs having the problem  because RST turned itself back on, but reboot -f, going to bios, and turning it off again let me boot. so that's what I'll be doing every time it boots I guess, but at least it works now.


Prove: For a,b,c positive integers, ac divides bc if and only if a divides b

Prove the biconditional statement. For $a,b,c$ positive integers, $ac$ divides $bc$ if and only if a divides $b$.


Should we rinse with water after brushing our teeth?

I've heard that rinsing with water after teeth brushing lowers or negates the benefits that fluoride provides to our teeth, but I've also heard everything in between; from there's no problem with it, to rinse with as little water as possible, to mix water with toothpaste and rinse with it.  Example from :      So, should you rinse your mouth out with water when you have finished brushing or leave some toothpaste in your mouth? "For children, I would say wash out, because if they still have adult teeth that have yet to come through, they may end up with too much fluoride in their body, which can damage their teeth. For adults, it's good to leave a film, but in moderation – you don't want a mouthful of toothpaste. I have a semi-rinse: I put a tiny bit of water in my mouth to brush away the toothpaste on my tongue."   and from :      I know this this is not common practice, but it is actually quite important! Fluoride, one of the active ingredients in toothpaste, doesn't spend much time in contact when your teeth when you are brushing. Thus, it is crucial to let it work after you have already brushed your teeth. According to dentist Dr. Phil Stemmer, from The Fresh Breath Centre in London, "Rinsing washes away the protective flouride coating left by the toothpaste, which would otherwise add hours of protection." If you are thirsty drink a glass of water before brushing your teeth!   In contrast, this article quotes :      Previous studies have indicated that rinsing the mouth with a beaker of water after toothbrushing may compromise the caries reducing effect of fluoride toothpaste. It is concluded that post-brushing rinsing with water, under the conditions of this study, does not significantly affect the caries reducing effect of a fluoride toothpaste.   and     I think the reason that there is some disagreement on this subject is because not rinsing after brushing appears to be only beneficial if you are at a high risk of getting cavities.   And as two commenters said below, not rinsing feels kind of counter intuitive, but seems to be the way to go. Is it?   Assuming normal and healthy teeth, what's actually better? Which one carries the most benefits? Should we rinse with water or not? Are there studies about this? Is there a consensus yet?


How to cite scanned image copies of physical books?

As I presume others have, I've located useful source publications on the . The source templates I have don't seem to cover the case of a scanned copy of a physical book, other than for published microfilms. In this case, it isn't a microfilm, but it isn't a physical book either, so neither template seems to apply.  I'd like to be able to cite the source, indicating both that it's an electronic copy from archive.org, but ideally also including the associated information about the original scanned book (although I think the difficulty of listing multiple repositories for a source has been mentioned here before). I could cite it as a physical book, listing archive.org as the repository, but somehow that doesn't seem correct.  A question that has been asked in the past is  However, it mostly discusses digital books (e-books), not so much scanned copies of physical books. They do suggest just using the physical book template and adding the URL for the scanned version, which I suppose could be made to work. Seems clumsy, though.   My main concern is which template best applies to this case?