Please suggest how can I get this type of straight lambda, refer image:


Better visibility for closed posts that have been edited

I would like to see something that gives closed posts that have been edited a little more visibility.  All edits bump the thread back to the front page, but there it tends to be drowned out in the noise. In particular, there is no indication as to whether the question has been edited after closing. There's no way to distinguish between “closed question, 99% chance that I won't disagree with the closing, I'm not even looking” and “closed question that's been edited, maybe I should see if it warrants reopening”.  While flagging for reopening is an option, this requires that the editor can flag and knows that he should flag. Besides, it would be better if reopening could be achieved by the community in practice (not really the case on less-trodden SO tags or on smaller sites). Replying to a comment can also bootstrap the reopening process, but only if high-enough-reputation users commented. When the asker is a new user, passively waiting for reopen votes is often all they can do and know how to do.  Since there are new review queues in the works, I think this should be part of one of them, perhaps together with the questions with reopen votes, but I don't have a precise implementation in mind. What I'm asking for is some way of having these closed-then-edited questions reach potential reopeners, without being lost in a sea of other boring stuff.  Note that this feature request is purposely different from . I don't think the people who did the closing should necessarily be the ones judging to reopen. Once edited, the post should be thrown back to the community in general — if only because the closers might not be around.


I have a string called myStr="file://test"; I want to get text after file:// test out of it; I could do it with   myStr ="file://test" myStr.substr(myStr.lastIndexOf('/') + 1);   but thats not the right way; could you please help me with regular expression: My attempt with regualr expression is the following, but it just checks (if exists it returns 0) whether it exists or not(if it does not exist -1 to return)      myStr.search(new RegExp("file://"))


In the following figure prove that: $AK||BC$

In arbitrary triangle $ABC$, let $G$ be centroid and $AH$ be a height.We extend $HG$ beyond $G$ to intersect circumcircle at $K$.Prove that $AK||BC$       I connected midpoint of $BC$ to $K$ and $A$ to show $MA=MK$ but failed...


I have moved from win 10 to Ubuntu 16.04. I've tried following  and , but still run into problems as the latest kernel version is 4.6.3. I'm still running on the kernel that came installed with Ubuntu which is 4.4.0.  Long story short, my keyboard, touch pad, touch screen, volume and power buttons, the stylus, wifi indicator (top right corner) and camera are not working. I've managed to get the Wifi and Bluetooth working.  Can anyone help me out with writing/finding some patches and re-compiling the kernel?    Please post all updates and issues on   and any contribution is appreciated    and   To get the type cover working run SP4-1 script from


Proving a sequence converges by defining the sequence recursively.

Let $a > 0$. Choose $x_1 >$ $\sqrt a$. Define a sequence {$x_n$} recursively as $x_{n+1} = 1/2(x_n + a/x_n)$ for $n > 1$.   Prove that lim$x_n = \sqrt a$.  I think I first want to prove that {$x_n$} is bounded below by $\sqrt a$. But, I am having trouble with this. Could someone help me out a little?


I'm still running Ubuntu 11.10.  Can I upgrade to 14.04 directly from 11.10, or is there a certain upgrade-path one needs to follow?  Also, is 14.04 stable enough, or is it better to stick to an earlier version for now?


I am trying to print the lines using the repetition symbol {n} but it is not working.  For. e.g. I want to print all lines whose length is 4 char long   awk '/^.{4}$/' test_data   The above code is not printing that .How to fix it so that I can use the repetition symbol? I know the alternative like awk  '/^....$/' test_data and awk  'length ==3 ' test_data


Can I run a 12.04 64-bit server with only 1GB RAM?

My friends ask me to build him a web server with 12.04 64-bit server edition in his 1GB RAM server.  Is it recommended or safe? Because I heard 64-bit system need at least 2GB RAM.


Buoyant force when object is between two liquids

Suppose we have a ball floating in liquid A. Then we pour a liquid B on top of the ball (Assuming that the liquid is poured such that the ball doesn't oscillate) . The ball rises up. Why?  According to me, the liquid on top (liquid B) will exert a force downward on the ball and it should go lower. The particles in the liquid B will exert an normal force which is acting downwards on the ball. How can adding liquid B make it rise up, that is, provide an upward force?  Taking a specific case, density of B > density of ball > density of A   what would happen?


Natural scrolling with mouse on Ubuntu 14.04

I'm trying to figure out a way to get natural (reverse) scrolling to work with a mouse. I know Ubuntu has a "natural scrolling" preference under System Settings, however, that only applies to the trackpad and doesn't work with an external mouse. I've tried the :  sudo add-apt-repository ppa:zedtux/naturalscrolling sudo apt-get update && sudo apt-get install naturalscrolling   I also tried messing with the .Xmodmap file; however, that doesn't seem to work consistently across all applications, which drives me crazy.  Anyone knows how to get natural scrolling to work consistently across all applications with a mouse?


what electronic thing we can take while travelling to India by Air

If I and my wife are traveling to India can I take two mobile phone, one smartphone and one I pad?


First-authorship was taken by my Master's supervisor; how to strengthen my PhD application?

I have two papers in CS published during my Master's studies. The idea, the experiments and the writings were done all by myself, but my previous supervisor took the first-author place forcibly.   I am planning on applying to US PhD programs. My questions:        Generally speaking, will these publications still carry the same   weight as if I were rightly listed as the first author?    Are there any general strategies I can use to maximize the impact that   these publications will have on my acceptance?


How can I determine if someone's SSH key contains an empty passphrase?

Some of my Linux & FreeBSD systems have dozens of users. Staff will use these "ssh gateway" nodes to SSH into other internal servers.  We're concerned that some of these people use an unencrypted private SSH key (A key without a . , because if a cracker ever gained access to their account on this machine, they could steal the private key and now have access to any machine which uses this same key. For security reasons, we require all users to encrypt their private SSH keys with a passphrase.  How can I tell if a private key is not-encrypted (e.g. Does not contain a passphrase)? Is there a different method to do this on an ASCII-armored key vs. a non-ASCII-armored key?  Update:  To clarify, assume I have superuser access on the machine and I can read everybody's private keys.


When working with PDFs, I've run across the MIME types application/pdf and application/x-pdf among others.   Is there a difference between these two types, and if so what is it? Is one preferred over the other?  I'm working on a web app which must deliver huge amounts of PDFs and I want to do it the correct way, if there is one.


In-universe and out-of-universe meaning behind droid names?

What are the in-universe and out-of-universe meanings behind the names droids are given?   The out-of-universe origin of R2-D2 ("Reel 2 - Dialogue 2") is widely known, but what about in-universe?  There a question about the out-of-universe meaning of C-3PO as @Richard points out, but what about in-universe?  My question is different because I'm looking for a long list of in and out-of-universe info on the many droids of Star Wars.    IG-88 TC-14 C1-1OP 4-LOM R4 8T-88   Etc.   What do they all stand for?


HTTP webpage is showing "Not Secure" in Chrome

I've called GoDaddy a few different times and they said that it looks like it is a problem with my HTML file.  Except, my HTML file is the basic outline of a webpage, nothing fancy at all.    Chrome still says that the webpage is, "Not Secure" with the big red x over it.    I'm not sure what to do to fix it, I don't have any personal information on the site nor am I collecting any information from visitors (it's sort of an information site).  I shouldn't need an SSL certificate because I am not hosting anything privately.


When I use Chrome to listen to music, sometimes the volume suddenly goes down. Other sounds are just normal. This is the Windows Sound mixer shows:    The volume meter on Chrome has 2 indicators. I have no Skype or any communication application on at that time.  My Chrome version is "Version 36.0.1985.125 m" (newest up to now). Here is the extensions list:    What is the problem with Chrome? How can I fix it? It is quite annoying that I have to move the volume up everytime this happens.


How can I have a "constant variable" for multiple Materials

I have many of different materials, and they each need to have a mix factor changed all at once. I do not want to animate all of them separately. Is there any way to use one thing for all of them?


Ubuntu 18.04 - fail to install using `apt-get install` after fail installing `VirtualBox`

I tried to install apt-get install virtualbox. it fails due to dependencies issues.  to fix it - i tried sudo dpkg --configure -a, and get stucked after a while.  now when I'm trying to install other ( git ), it goes back to same problem:  guy@desktop:~$ sudo apt-get -f install [sudo] password for guy:  E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.  guy@desktop:~$ sudo dpkg --configure -a Setting up virtualbox-dkms (5.2.10-dfsg-6ubuntu18.04.1) ... Removing old virtualbox-5.2.10 DKMS files...  -------- Uninstall Beginning -------- Module:  virtualbox Version: 5.2.10 Kernel:  4.15.0-23-generic (x86_64) -------------------------------------  Status: This module version was INACTIVE for this kernel. depmod...  DKMS: uninstall completed.  ------------------------------ Deleting module version: 5.2.10 completely from the DKMS tree. ------------------------------ Done. Loading new virtualbox-5.2.10 DKMS files... Building for 4.15.0-23-generic Building initial module for 4.15.0-23-generic


How do $\lim_{n\to\infty} \frac{\tan(n)}{2^n} =0 $?

How do one show $\lim_{n\to \infty} \frac{\tan(n)}{2^n}=0 $ But, I didn't compute $\lim_{n\to \infty} \frac{\tan(n)}{2^n} $, as $\lim_{n\to\infty} \tan(n) $ doesn't exist even in extended real line. So, I am unable to use L'Hospital's rule. What should I do? My other question is what is the limit of $\lim_{n\to\infty} |\tan(n)| $, is it $\infty$ or doesn't exist infinitely? Sorry to everyone for edit, i am now curious about this limit. That's why I edit it. I knew, I asked a different question before in this post, but please don't do vote for closing it, I didn't know much about this $\lim_{n\to \infty} \frac{\tan(n)}{2^n}$ because of the tan(n) term, so , please help me how should I deal with it?


I am flying back to the US (Oakland) from Cancun through Guadalajara. We did not clear immigration or customs in Cancun, because the first leg was domestic, but it appears that we don’t need to clear immigration in Guadalajara, either. We were able to transfer flights without having to pass an immigration checkpoint. Currently, we are waiting at the gate in GDL. Is this any cause for worry, since it doesn’t look like we need to register an exit from Mexico?


Why is the special linear group generated by elementary matrices that add a multiple of row $j$ to row $i$?

The general linear group is generated by elementary matrices that add a multiple of row $j$ to row $i$ and elementary matrices that multiply row $i$ by a scalar. This is because you can write an invertible matrix as the product of elementary matrices, and a row swap matrix can be written as a product of the other two types of elementary matrix.   So far, I've worked out that all matrices that are products of this type of elementary matrix are in the special linear group, but I don't know how to proceed.


What is port forwarding and what is it used for?

There are a lot of questions on , but there doesn't seem to be one that clearly states what it is and what it's used for. So:   What is port forwarding? What is it used for, and why would I need it?


Is a function with a closed graph continuous?

Let $f:\mathbb{R}\to \mathbb{R}$ and denote $A_f=\{(x,f(x)),x\in\mathbb{R}\}$.  I've proved that if $f$ is continuous, then $A_f$ is closed. But I have no clue for the other direction. Does $A_f$ closed also imply $f$ continuous?  Thanks a lot~


Show that any positive rational number can be expressed as $\frac{a^3+b^3}{c^3+d^3}$.

Show that any positive rational number can be expressed as $$\frac{a^3+b^3}{c^3+d^3}$$   Perhaps the statement means that for every two positive integers $m$ and $n$, there exists a $k$ such that $mk$ and $nk$ both can be expressed as the sum of 2 cubes.  Personally, I have no idea how to solve this problem. Please help.  Thanks.


Motion tracking with large sweeping camera moves

Hi I wish to motion track a scene that involves large sweeps which means the end frame contains none of the markers placed in the first frame. I'm not sure how to have adaptive markers or markers that are not in the first frame which are included in the solve/bundle? I'm coming from boujou where it updates new trackers if old ones are not on screen.


is it recommended to keep Java serializationUID unique? What will happen if I give same serializationUID =1 to all Java classes

I was following the article  to understand Seriliazation.  In this its said that Java serializationUID recommended to be unique. I dont understand the reason for that.  Can someone please explain?


This is quite messed up, I know. Let me explain it all.  I have a dynamic DNS set on my router. I verified that, after port forwarding, I can connect to desired application (if I run something on port 1337 and forward the port to appropriate machine I can connect to it from outside with no issues).  Now, if I connect my Macbook to VPN and run something as described above, it works as expected. BUT, if I connect my machine running Ubuntu Server 16.04 to the VPN and run something or want to connect by ssh, it fails. I forwarded port I'm using for SSH connection on router. I also tried hosting a web server, which also failed.  What can I do about this issue? This doesn't make sense to me.  About Ubuntu Server machine: it's a clean install with openvpn client and ssh server configured, no firewall running, iptables not edited, connected to router via ethernet.  EDIT: Here are the routing tables:


What is the motivation of introducing an additional level of indirection from the descriptive 'false positive' to the integer '1'? Is 'false positive' really too long?


Fibonacci identity: $f_{n+1}f_{n-1} = f_n^2 + (-1)^n$


If the LHC can accelerate a proton to within 3 to 4 m/s of the speed of light, as a point of curiosity, what would happen if the entire LHC loop itself were constructed on train tracks, such that the loop itself could travel at 5 m/s?    Could the proton effectively move, from a stationary earth reference frame, faster than light?


Automatic geo-referencing options - mosaic dataset footprints?

I have 50 Jpgs that represent a route and I want to automatically georeference them. I have previously georeferenced 50 jpgs that exactly match the image extents and created a mosaic dataset. I would simply copy and rename the .jgwx/xml files and this almost works, but I am assuming because the resolutions of the jpegs are different this is offsetting them slightly.  Is there a way of automating this possibly using previous mosaic footprints?   I also can't re-export them from source to match resolutions.


When should we discretize/bin continuous independent variables/features and when should not?

When should we discretize/bin independent variables/features and when should not?  My attempts to answer the question:   In general, we should not bin, because binning will lose information. Binning is actually increasing the degree of freedom of the model, so, it is possible to cause over-fitting after binning. If we have a "high bias" model, binning may not be bad, but if we have a "high variance" model, we should avoid binning. It depends on what model we are using. If it is a linear mode, and data has a lot of "outliers" binning probability is better. If we have a tree model, then, outlier and binning will make too much difference.   Am I right? and what else?    I thought this question should be asked many times but I cannot find it in CV only these posts


Does instanceof operator generate a lot of overhead ? Why?

I have a colleague here in my project, who is deeply against the use of instanceof operator, because it "generates a lot of overhead", what is the reason for that? Is it true?  Is there another way to check the type of the Object instead of using it?   Because I find it very useful in some occasions.


I'm aware of (multitudinous)  concerning this, but I still feel tentative for the following example. I also referenced . Predicated on these, I'd guess that        "there are happiness and joy" is correct,   and "there is happiness and joy" is wrong.      Here, there is (I know why it's NOT there are here) a compound subject containing two nouns, thus the verb must be conjugated for a plural subject.  Yet  contradicts this significantly? Why? I fear that I  misconstrued something?


It seems sometimes 'if' really means 'if and only if' (abbreviated as iff), and sometimes 'if but not necessarily only if'.   Is there a better usage with 'if' than the regular/default way?  Should I be more careful when writing technical writings?


How to display the Linux kernel command line parameters given for the current boot?

In the grub.conf configuration file I can specify command line parameters that the kernel will use, i.e.:  kernel /boot/kernel-3-2-1-gentoo root=/dev/sda1 vga=791   After booting a given kernel, is there a way to display the command line parameters that were passed to the kernel in the first place? I've found sysctl,  sysctl --all   but sysctl shows up all possible kernel parameters.


I can't understand this. Can you please make a clearer explanation?


What is the package name for "ls" command?

I was reading about packages, and I wondered what are package names for commands like "ls" and "echo"? These commands were installed on every Linux machine I've worked with, and I don't know which package installs them.  $ sudo apt purge ls   Reading package lists... Done   Building dependency tree          Reading state information... Done   E: Unable to locate package ls  $ sudo apt purge echo   Reading package lists... Done   Building dependency tree          Reading state information... Done   E: Unable to locate package echo   And the same thing happened for lots of other commands.  Q1. Is there any package which has all these primary commands in?  Q2. Do "ls" or "echo" or ... have a package? or they are just some commands?  Q3. How can I find the package name of commands like "ls", "echo", "read" and so other?


Prove that $A-(B-C)=(A-B) \cup (A\cap C)$

I am trying to prove that $A-(B-C)=(A-B) \cup (A\cap C)$ For the first statement, I do: Let $x \in A-(B-C)$ means that $x \in A$ and $x \notin (B-C)$ $x \notin (B-C)$ means that $x \notin B$ or $x \in C$ $(*)$ Therefore $x \in A-(B-C)$ means that $x \in A$ AND ($x \notin B$ or $x \in C$) For the second statement, I do: Let $x \in (A-B)$ means that $x \in A$ and $x \notin B$ $x \in (A \cap C)$ means that $x \in A$ and $x \in C$ Therefore, $x \in (A-B) \cup (A\cap C)$ means that $x \in A$ AND ($x \notin B$ or $x \in C$) $(*)$ Those two are the same so these sets are equal. I'm not sure if I did the $(*)$ parts correctly. Can someone give me some guidance?


We all know that speed of gravitational waves (GW) and that of light in space are exactly the same (= $c$).  We also know that space is medium for GW.   Does that mean space is also the medium for light?  Because both of them are waves, and speed of a wave is property of the medium.   Is there any other way to justify the identical speed of the two?


How to request a specific IP address from DHCP server?  This question also touches the topic of DHCP address reservation in a router.  Background: My home routers DHCP table only allows to create an IP address reservation of an assigned IP. It does not let me edit the table and manually assign the device an arbitrary IP for the next renew.


I'm having a minor reference problem. Im using LyX 2.1.0 on Mac and Jabref 2.9.   My problem is that when I'm making a reference to an article/book, etc. that have exactly two authors it says "and" between the authors, for example (Petersen, C. and Plenborg, T.).   Right now, I'm writing a seminar that has to be in my native language (danish) and therefore, I need to replace the "and" with "og". How can I do that?  I have tried to change the language-settings in both LyX and Jabref to danish, but it doesn't work. Jabref is set to the ISO8859_1 encoding - I don't now if it has something to do with that?  Any help is appreciated.


How to remove the notification "1000 Unread Messages" beside login logo in Windows XP?

My sister computer have three logins: 1.) Administrator 2.) Limited Account 3.) Guest  Everytime the pc is open, the Admin login have notification beside it saying: 1000 Unread Messages. How to remove that?  I once read messages there using Portable Thunderbird (from a USB stick), maybe it is the cause of the notification.  But it sticks there everytime the pc is open, no usb stick is attached, but the notification remains.


I was reading an article and came across to the following sentence. Rock fulgurites, found almost exclusively on the peaks of mountains, appear as a thin crust on the surface of rocks. What I couldn’t understand was why the words 'surface' and 'crust' are singular. As it says the peaks of mountains, I thought these two words should be plural. Can someone explain why they are singular?


What are some good exploratory analysis and diagnostic plots for count data?

Does anyone know of good reference material on exploratory analysis and diagnostic plots for count data?


How to read the data in CSV file and create object accordingly by using python console in blender

i have a .csv file like the picture above i want to read the csv file and be able to pull out the information and make it like something below:  |mode        |   lon            |   lat       |  name      |  |subway     |   116.3572162|   39.8980033|  name1     |  i want to create a mesh according to the information from the csv file i want the mesh to be in the exact location of the longitude and latitude. please help , i'm really new to programming :(


Validation of machine learning algorithms implementation

What are some techniques by which we can verify that a current implementation of a machine learning algorithm is correct?  Is using the results of a benchmark dataset is enough?


Why will ridge regression not shrink some coefficients to zero like lasso?

When explaining LASSO regression, the diagram of a diamond and circle is often used. It is said that because the shape of the constraint in LASSO is a diamond, the least squares solution obtained might touch the corner of the diamond such that it leads to a shrinkage of some variable. However, in ridge regression, because it is a circle, it will often not touch the axis. I could not understand why it cannot touch the axis or maybe have a lower probability than LASSO to shrink certain parameters. On top of that, why do LASSO and ridge have lower variance than ordinary least squares? The above is my understanding of ridge and LASSO and I might be wrong. Can someone help me understand why these two regression methods have lower variance?


how do I make a list into multiple lists of that list?

so lets say this is my list:  my_list = ['a','b','c','d','e','f']   and I want it to become:  new_list = [['a','b','c'],['d','e','f']]   I know there's a way to do it with:  new_list = [] new_list1 = [] new_list2 = []     for x in my_list:   new_list1.append((x[0]+x[1]+x[2]))   new_list2.append((x[3]+x[4]+x[5]))   new_list.append((new_list1+new_list2)) print(new_list)   is there another way to do it? Thank you


How to approach the modeling of duct work, piping, wiring?

I'm wondering how to approach duct work, piping, and wiring? In the past, I have used the spin tool to make corners, but I find it very cumbersome. How do you do duct work and piping? I have seen people use curves, but I find it's hard to get straight 90 degree angles or just uniform angling across the whole model. It's also hard connecting piping together if they started from different locations. Here's some reference:


What does $\mathbb{Q}(\sqrt{2},\sqrt{3})$ mean?

What set is $\mathbb{Q}(\sqrt{2},\sqrt{3})$? Is it the set $X = \{a\sqrt{2}+b\sqrt{3}:a,b\in\mathbb{Q}\}$?


Prove by induction that a^n+a^-n is an integer.

I am to prove by induction that given that $a+1/a$ is an integer (i.e. belongs to Z  ) then $a^n+1/a^n$ is an integer too. I'm pretty much clueless here. Thanks in advance.


"We must eat to live, not live to eat." — What kind of rhetorical figure is that?

In this kind of sentence the second half is an inversion of the first half. Is it a rhetorical artífice? What kind?


Error need help /boot/grub/x86_64-efi/normal.mod not found

I'm really frustrated! I bought me a new laptop a half year ago, with windows 8 pre-installed. Then I installed Ubuntu 13.04 as a dual boot, but after a short time of using my Laptop, software-center couldn't open... so I wanted to reinstall Ubuntu. I inserted the Ubuntu DVD and used "delete Ubuntu and reinstall" (or something like that). When I now reinstalled, I needed to restart, which I did... when I now restart, the laptop shows the ASUS logo, but then only appears a Black screen with a white text that shows:  error: '/boot/grub/x86_64-efi/normal.mod not found  grub rescue>_   I already wanted to boot from the Ubuntu DVD, but I doesn't load the DVD! what can I type in, to rescue, my data?, I would also delete everything, but I still want to use my Laptop! Please, I need help, please, I would be pleased for every answer!


Neither the plates nor the serving bowl "goes" or "go" on that shelf?

Neither the plates nor the serving bowl goes on that shelf.   Neither the plates nor the serving bowl go on that shelf.      What form of the verb is better in this context, singular or plural? Which is correct and why?


Proving $\displaystyle{\lim _{n\to\infty}}\sqrt[n]{n} = 1$ given that $\inf \{\sqrt[n]{n}|n\in \mathbb{N}\} = 1$

Here's my attempt at trying to prove it by definition:  $$\exists \mathcal{E} > 0 | \exists N\in \mathbb{N}|\forall n > N:$$ $$|\sqrt[n]{n}-1|<\mathcal{E}$$  But from this point on, I'm not sure how to demonstrate that $N$. I tried applying the mean inequality, but when I do, the indexes cancel out and I get something like $1< \mathcal{E}$, which negates the proof. How can I proceed? I also don't know how to utilise the fact that the infimum is equal to one.


Why is an army of White Walkers afraid of the water?

At the end of the Massacre at Hardhome in the 5th season of Game of Thrones, the army of the dead stood on the shores watching as Jon Snow and the survivors very slowly rowed away. From a narrative standpoint, it’s easy to see why the show needed the ice zombies to stop here, as it delivered one of the show’s most impressive and terrifying moments — the raising of the dead with a hand gesture by The Night’s King. But it also raises some fundamental questions about this undead army. Are they afraid of water?


Strange output summing up values in a list


I'm writing a Nintendo Gameboy emulator in Java, but I have a problem emulating the processor. The original clock rate is approx. 4.19MHz. How to do this? I've thought about putting in Thread.sleep(long, int), but it wouldn't work, because with it you can emulate up to 1MHz, but not 4MHz. Is there something similar but more precise? Is there another way like decreasing execution speed?


Finding the Limiting Distribution of an order statistic

I've been told that the sequence X1, X2,...,Xn are iid from Exp(y) with density function f(x)=(1/y)*exp(-x/y). I've been asked to find the limiting distribution of Wn = Xn:n - ylog(n) where Xn:n is the first order statistic. However, I feel totally stuck. I feel as if I need more information on the sequence of random variables in order to solve the problem. Any help is greatly appreciated.


Can I check to see if an object is used in another objects modifier?

I have a complex file with a lot of objects in it. Many of them are there as a target for a modifier of some kind Boolean, curve modifier, etc. Sometimes I go through and clean out objects that are no longer needed. The problem is that it isn't always apparent if the object is being used in another object's modifier stack. I don't want to break my work only to find out a day later that I deleted something important. Is there some way that I can quickly see if the object is being used?


I only have ubuntu 16 installed and I have somewhere along the line of formatting external drives, formatted what i think is my boot partition. Now when I boot my laptop i just sent straight to bios. I have tried boot-repair but to no avail and ran a smart(desktop utility) test and results can back as disk ok. Anyone have any suggestion as to how to recover this so I can boot ubuntu again, without a complete reinstall?


A question about polynomial in two variables

Let $f:\mathbb R^2 \to \mathbb R$ be a function such that for any $b \in \mathbb R$ , the function $f_b : \mathbb R \to \mathbb R$ defined as $f_b(x):=f(x,b) , \forall x \in \mathbb R$ , is a polynomial in $x$ and for any $a \in \mathbb R$ , the function $f_a : \mathbb R \to \mathbb R$ defined as $f_a(y):=f(a,y) , \forall y \in \mathbb R$ , is a polynomial in $y$ . Then is the function $f(x,y)$ a polynomial in $x,y$ i.e. is $f \in \mathbb R [x,y]$ ?


difference between protected and package-private access modifiers in Java?

I have seen various articles on differences between the protected and package private modifiers. One thing  I found contradictory between these two posts     In this the accepted answer says that     The protected modifier specifies that the member can only be accessed within its own package (as with package-private) and, in addition, by a subclass of its class in another package.    In this the accepted answer says that     To satisfy protected level access two conditions must be met:         The classes must be in the same package.   There must be an inheritance relationship.       Aren't they contradictory? from my understanding of other articles, the first post gives the correct answer that protected == package-private + subclass in other package.   If this statement is correct, then why this code fails with the following error message on my subclass Cat on line 17  The method testInstanceMethod() from the type Animal is not visible    my code for super and subclass are below.  package inheritance;  public class Animal {      public static void testClassMethod() {         System.out.println("The class" + " method in Animal.");     }     protected void testInstanceMethod() {         System.out.println("The instance " + " method in Animal.");     } }  package testpackage;  import inheritance.Animal;  public class Cat extends Animal{         public static void testClassMethod() {             System.out.println("The class method" + " in Cat.");         }         public void testInstanceMethod() {             System.out.println("The instance method" + " in Cat.");         }          public static void main(String[] args) {             Cat myCat = new Cat();             Animal myAnimal = myCat;             myAnimal.testClassMethod();             myAnimal.testInstanceMethod();         }     }   Please clarify why the above code fails. That would be very useful. Thanks


How can I figure out if my hardware specs are adequate for Ubuntu 13.10?  My Lenovo G505 is a modern laptop which seems to fulfill the official minimums, but  GUI interaction is  slow, even with Lubuntu or Xubuntu. I'd like to understand if something is misconfigured or if the  hardware is really too limited.  I'm not asking for a specific assessment of my specs, but I'd like to know-- how do I figure this out?  (Specs: AMD E1-2100 Dual Core, with 2 GB RAM and an AMD Radeon HD 8210M graphics accelerator)


How to assign a key on my keyboard to my Mouse?

Ok, so this is a weird question as it makes my mouse next to useless while this is active.  I want to be able to click my mouse and it in turn think will I'm pressing a key on my keyboard instead of clicking the mouse. Is this even possible?   I want to use it so I can play a game called Rogue Legacy (a platformer). Because currently there is no way to bind your mouse to attack, which is really annoying to me.  This is not a duplicate, this is why: I'm trying to bind my left click on my mouse to press the F key on my keyboard instead of registering it as a left click from the mouse.


I am trying to install G++ compiler in Ubuntu 13.10. It told me I needed to install the build-essential package.  I have tried the below code  sudo apt-get update sudo apt-get install build-essential   It gives me this error:  Reading package lists... Done Building dependency tree  Reading state information... Done E: Couldn't find package build-essential


Whose idea was it to kill off this character?

To fans (myself included) seeing a lot of the old cast return was a huge leap back to my childhood. But for some, the role wasn't all that exciting. In a lot of interviews about the return to the role of Han Solo, Harrison Ford provided a few statements that came across (with his usual "grumpy" attitude) that the role was not all that exciting.  “Well, I didn’t have a job,” he says with a wry grin. [...]At 73, Ford is one of the few action heroes who can also claim senior citizen status, which might explain his hesitation at returning to this iconic role.   As well as a bit of a joke line from the movie that branches off from a real-life experience that  covers:  "Are you Harrison Ford?"/"Are you Han Solo?" "I used to be..."  There was also another interview that involved him, Daisy Ridley and John Boyega in which he refused to talk about his role, and instead focused on the Ridley and Boyega's involvement in the movie (with some excitement, from memory). So my question is:   Whose idea was it to kill off Han Solo?


Electrons residing in an orbit with energy lower than the ground state energy

Is it possible for an electron to reside in an energy level lower than that of the ground state? What happens to the electrons when an atom is brought down to 0K , do they come closer? What happens to the left of the orbitals ?


How to access to C global variable structure by Python and ctype

I have to integrate python with external so library. Unfortunately, the C code uses a global variable SimpleTest_Y (structure) and I need to access it in order to modify the value(s).  Here the C code  SimpleTest.c file  #include "SimpleTest.h"  /* External inputs (root inport signals with auto storage) */ ExtU_SimpleTest_T SimpleTest_U;  /* External outputs (root outports fed by signals with auto storage) */ ExtY_SimpleTest_T SimpleTest_Y;   /* Model initialize function */ void SimpleTest_initialize(void) {   /* external outputs */   SimpleTest_Y.Out1 = 3.0; }   SimpleTest.h file  #ifndef SimpleTest_COMMON_INCLUDES_ # define SimpleTest_COMMON_INCLUDES_ #include <stddef.h> #include <string.h> #endif                                   /* External inputs (root inport signals with auto storage) */ typedef struct {   double In1;                          /* '<Root>/In1' */   double In2;                          /* '<Root>/In2' */ } ExtU_SimpleTest_T;  /* External outputs (root outports fed by signals with auto storage) */ typedef struct {   double Out1;                         /* '<Root>/Out1' */ } ExtY_SimpleTest_T;   /* External inputs (root inport signals with auto storage) */ extern ExtU_SimpleTest_T SimpleTest_U;  /* External outputs (root outports fed by signals with auto storage) */ extern ExtY_SimpleTest_T SimpleTest_Y;  /* Model entry point functions */ extern void SimpleTest_initialize(void);   python wrapper  import ctypes  class Inp(ctypes.Structure):    _fields_ = [('In1', ctypes.c_float),                ('In2', ctypes.c_float)]  class Out(ctypes.Structure):    _fields_ = [('Out1', ctypes.c_float)]                  myLib = ctypes.CDLL('./SimpleTest.so')  #Initialize SimpleTest_initialize = myLib.SimpleTest_initialize SimpleTest_initialize()    #Output SimpleTest_Y = myLib.SimpleTest_Y SimpleTest_Y.restype = ctypes.POINTER(Out)  #print type(SimpleTest_Y) print SimpleTest_Y.Out1   The python invocation of the initialize method works, but when I try to access to SimpleTest_Y.Out1 I get the following error:  print SimpleTest_Y.Out1      AttributeError: '_FuncPtr' object has not attribute 'Out1'   I think I'm not able to access to global var defined on external C library...  NOTICE: it is a structure not a normal var


Proof about inner product space $\vert \langle x,y\rangle \vert=\Vert x \Vert\Vert y \Vert$

Prove that if $V$ is an inner product space, then $|\langle x,y\rangle| = \Vert x \Vert\Vert y\Vert$ if and only if one of the vectors $x$ or $y$ is a multiple of the other.  I am given a hint to let $a= \frac{\langle x,y\rangle}{\|y\|^2}$, and let $z = x - ay$, then prove $y$ and $z$ are orthogonal and $|a|= \frac{\|x\|}{\|y\|}$. I don't know how they come up with this, what was the original idea?


Overnight, TextWrangler crashed with a message "TextWrangler" is damaged and can't be opened. I deleted "TextWrangler" and download it again from the App Store.  I couldn't update from the Mac App Store, because the latest version of TextWrangler requires 10.8.5 or later, so Snow Leopard and Lion users are out of luck.  Since the crash happened at midnight, I wagered a guess that it was date/time related.  Sure enough, changing the system date back to November 11 magically "repaired" the "damaged" app and allowed it to start; while coming back to the present (November 12) made the app refuse to start, with the same message as before.  That's not a tenable long-term solution; but, all is not lost.  (See my "fix" in the answer section.)  I'm still curious as to why the app stopped working on a particular day though; and, if there is a better solution that stays "in channel" with the App Store.  Update:  It appears that this is .


How to find the fraction of integers with the smallest denominator matching an interval?

I have a real interval $\mathbb{S} \subset ]0; 1[$.  How can I find the smallest $n \in \mathbb{N}$, for which there is a $k \in \mathbb{N}$, for which $\frac{k}{n} \in \mathbb{S}$?  1The important thing is to do this effectively. For example, just trying all the possible denominators $\frac{1}{d-c}$ for the interval $]c, d[$, would work, but it is obviously not effective (like if we would decide the least common multiple of two natural numbers by trying all the natural numbers smaller than their multiple).  2The problem came into my mind as an interesting, l'art pour l'art programming problem, what I formulated also as a . However, meanwhile I became curious also to the math side, which can be the optimal algorithm, or a nearly optimal one.


$M_1$ and $M_2$ are subgroups and $M_1/N=M_2/N$. Is $M_1\cong M_2$?

Let $G$ is a group and $N$ is normal in $G$ and $M_1$ and $M_2$ are  subgroups which contain $N$ such that $M_1/N= M_2/N$. Can we deduce that $M_1$ and $M_2$ are isomorphic?  Thank you for hints.


What is a good book on electricity such as generators for someone who is a beginner and want to learn about the generator and such.


Understanding linear algebra in Ordinary Least Squares derivation

In ordinary least squared there is this equation (Kevin Murphy book page 221, latest edition)  $$NLL(w)=\frac{1}{2}({y-Xw})^T(y-Xw)=\frac{1}{2}w^T(X^TX)w-w^T(X^T)y$$  I am not sure how the RHS equals the LHS. Maybe my linear algebra is weak but I can't figure out how this happens. Can somebody point out how this happens. This is related to deriving the Ordinary Least squares equation where $\hat{w}_{OLS}=(X^TX)^{-1}X^Ty$  NLL - stands for negative loglikelihood.  I am attaching the screen shots of the relevant section. My equation is in the 1st image(page 221). I actually bought the book so I am hoping that showing 2 pages is not a copyright infringement. source (Kevin Murphy, Machine Learning, A probabilistic perspective)


Why use iterators instead of array indices?

Take the following two lines of code:  for (int i = 0; i < some_vector.size(); i++) {     //do stuff }   And this:  for (some_iterator = some_vector.begin(); some_iterator != some_vector.end();     some_iterator++) {     //do stuff }   I'm told that the second way is preferred. Why exactly is this?


How would you improve this shell script to check for errors before executing each task?

I am a beginner.  Here is a shell script I created that resides on a production server. The goal is to refresh my production Drupal content with that found on a staging/test server.  How it works: It shells into a test/staging server, does a mysqldump of my Drupal content database, then SCPs that dump over to a temporary folder in Production. From there, it takes a backup of the current Production Drupal content database (again via mysqldump) and then refreshes the Production content database with the dump from the staging server.  My question: While I know how to write a script to execute the commands, I am unclear on how to implement error checking (for example, checking a return code I guess?) before the next command executes.  #!/bin/bash # # Name: drupal_dump.sh # Developer: Michael Paul # Created: 2014-03-21 # Last updated: 2014-04-28 # Description:  #   1. Remotes into Test server, runs a script to take a dump of Drupal content DB. #   2. Copies (scp) that dump to Prod #   3. Takes backup of current prod Drupal content DB #   4. Overwrites current prod Drupal content DB with the one from Test # #   If needed, issue the following command to restore the production backup: #       mysql -p -u root myDrupalDatabase < path/to/backupfile.sql  REMOTEHOST=xx.xxx.xx.xxx REMOTEUSER=myRemoteUsername DUMPDIR=~/sqldumps DESTDIR=~/incoming BACKUPSDIR=~/backups LOGSDIR=~/logs  TIMESTAMP="`date '+%Y%m%d_%H%M%S'`" DUMPFILE="mysqldump_stage_${TIMESTAMP}.sql" PRODBACKUPFILE="mysqldump_prod_${TIMESTAMP}.sql"  # Remote into Test server, backup Drupal database echo "Creating dump file on Test server..." ssh -i ~/.ssh/myRemoteServer.pem $REMOTEUSER@$REMOTEHOST "mysqldump --routines -u root --password= myDrupalDatabase > $DUMPDIR/$DUMPFILE && exit" echo "Dump file created at $DUMPDIR/$DUMPFILE"  # Copy that dump to Prod echo "Copying Test dump file to $DESTDIR on Prod..." scp -i ~/.ssh/myRemoteServer.pem $REMOTEUSER@$REMOTEHOST:$DUMPDIR/$DUMPFILE $DESTDIR echo "File has been copied to $DESTDIR/$DUMPFILE on Prod."  # Backup current Prod Drupal content DB echo "Backing up current Production Drupal content database..." mysqldump --routines -u root --password=  myDrupalDatabase > $BACKUPSDIR/$PRODBACKUPFILE echo "File backed up as $BACKUPSDIR/$PRODBACKUPFILE"  # Overwrite current Prod Drupal content DB with that taken from Test echo "Updating Production database with content from Test..." mysql -p -u root --password= myDrupalDatabase < $DESTDIR/$DUMPFILE echo "Update complete."


How to evaluate $\lim\limits_{x\to 0+}\frac 1x \left(\frac 1{\tan^{-1}x}-\frac 1x\right)$?

How to evaluate $\lim_{x\to 0+}\dfrac 1x \Big(\dfrac 1{\tan^{-1}x}-\dfrac 1x\Big)$ ? I used L'Hospital's rule but with no success.


Create an installer/package for a script

Please keep in mind this is the first time I've ever written a bash script, worked on Linux just the first time really that I'm trying to achieve something like this.  I've written a script that I now want to make available to other people, I will be posting it on Github and what not. I've read and followed  up until step 6. But I can't seem to figure out how to apply it for my own needs.  What I have is three scripts. One script makes use of the two others. They are right now just sitting in a directory. What I want to do is make it installable by making a .deb package of it.  When you install the package I want the scripts to be placed in a corresponding directory in /etc and I want to be able to create the man page and alias etc in the install process so everything will work after installing the program.  Could someone help me out on how to do this, or point me to a good tutorial that will help me to figure this out.


How to bypass the activation screen iPhone 5s (a1530) without sim?

How can i bypass the activation screen of iPhone 5s (a1530) without sim card in india. The emergency call method is not working.


Still alive, still alive after kill -9 / SIGKILL

An apache2 process got stuck on my server and caused problems with other services. (original problem: kerneloops after USB hardware disconnect)   root@server:~# ps aux | grep apache2 | grep -v grep www-data 12917  0.0  0.1 412148 16156 ?        D    Jun27   0:00 /usr/sbin/apache2 -k start   Naturally, I killd it. it's still alive. so I kill -9d it. It's still "alive".  Now this is where the question gets serverfault/unix&linux-worthy: Is there a way to get port 443 back without doing the obvious thing: rebooting? Iptables is installed.  Update: I could not resolve the Problem withouth rebooting. The general approach (use lsof or /proc/$PID/fd to find out which and get rid of that drive) as described here and in the "duplicate" could well have worked if not for additional (probably) hardware defects.


All my jpg images in LaTeX are coming out in black and white.  Similar question , but it doesn't seem to answer my question.  I am using Texmaker and latex + dvips + sp2pdf + ViewPDF  Here is an example of my code:   \documentclass[12pt,oneside,openany,a4paper,%..... Layout            afrikaans, english,%.............. Global language selection            ]{memoir}  \usepackage{babel}%.............................. Language setup \usepackage{graphicx}%........................... Graphicx loaded in usthesis   \begin{document} \begin{figure}[!htb] \centering \includegraphics[width=0.8\textwidth,natwidth=831,natheight=812]{FourHeliostatsTry3.jpg} \caption{Intersection and transformation of four heliostats} \label{Ffourheliostats} \end{figure} \end{document}


How do I determine an application's process name?

This is the situation:     Working on (the next version of) a Unity Quick List editor, I would like to add a reliable way of "restarting" launcher icons. To do so, I need to remove the icon (editing gsettings) and replace it on the same position. So far no problem. However, if the application in question is running, user will possibly lose data, as the application will quit when it's icon is removed from the launcher. What I need is a reliable way to find an application's process name, to let the editor check in the list of running processes if the application is running, and send a warning message to the user that the icon can not be restarted if the application is running.  What I did so far is make the editor look into the desktop file, to read the command, also read the command, stripped from the directory section, and furthermore look into possible remote scripts the desktop file command might refer to, looking for strings starting with "./"  Although the method seems to work well with all applications I tested it on, I have the feeling there must be an easier way to cover the problem in an "all in one" way...  Is there?  Also suggestions to catch more exceptional situations are welcome!


EDIT: Really sorry to put you through the trouble. The expression I am looking for is actually the summation of these values. Not the product. My bad  I'm looking for a condensed form of $\sum_{i=0}^{N/2}{N-i\choose i}$.  E.g. for $n=6$, I want to reduce ${6\choose0}+{5\choose1}+{4\choose2}+{3\choose3}$ into a single NCR or something that can be computed easily. Is it possible?


I was on a public Wifi. When I returned home, reconnecting to my network, a panopli of numbers appeared on the network for 3 seconds. Then my network went after that. Going on google, I received a message saying that my iPhone was in danger, that someone was watching what I was doing. Is this a scam? Because I wasn’t on this page, I was on Time2Watch. I would like to have sincere answers please, I would not want to be spied on. Here are some pictures of the images that '' google or the scam '' sent me.  Thank you !!!


Can't access files on Windows D drive after installing Ubuntu

While installing Ubuntu, I clicked on "delete and install Ubuntu only" (something like that).   I thought it would clear all the files in C and install Ubuntu. But I can't access my files on D drive. Were they deleted during the installation? If not, how can I access them?


Is it possible to query the content of the Time-based Workflow Queue from an Apex unit test to assess that a specific Workflow Rule has been executed and added a new item to the queue? I didn't see anything alike in the documentation, but wish it could be possible to improve testing and stability overtime.  Thanks


How do I output a scoreboard value or a selector to chat in Bedrock Edition?

JSON text format in Bedrock Edition is very different from that in Java Edition. The possible elements to go in the {"rawtext":[]} component are:  text translate with (args)  As you can see it is a very limited selection. This also means that there is no way to output a scoreboard score or a target selector's result to the chat. Is that right, or is there an alternate way to output these?


-ed and -ing adjective, how to use it properly?

Why is it grammatically correct to use these -ing adjectives:   annoying habit exciting news   and NOT these -ed adjectives:   annoyed habit excited news


How to improve the thermal stability of crystal oscillators?

I am working on a project for which I need a stable crystal oscillator of 1 Hz. I am planning on using a 32.768 kHz quartz crystal and then convert it to 1 Hz by frequency divider circuit( CD4060 + Flipflop ). I need to reduce the phase jitter and shift of the clock. Can anyone suggest any circuit or resources on that.?


Modelling with more variables than data points

I'm fairly new to Machine Learning/Modelling and I'd like some background to this problem. I have a dataset where the number of observations is $n<200$ however the number of variables is $p\sim 8000$. Firstly does it even make sense to consider building a model on a dataset like this or should one consider a variable selection technique to start with such as ridge regression or Lasso? I've read that this situation can lead to over-fitting. Is that the case for all ML techniques or do some techniques handle this better than others? Without too much maths a simple explanation on why the maths start to breakdown for $p>n$ would be appreciated.


If my opponent takes control of my creature, then it's exiled and later returns, is it still theirs?

I was wondering, if someone casts  and I cast  on it, when it returns from exile does it return under my control or theirs? For example if I  the Seal Away?


16.04 LTS constantly freezes and no sound

Ever since the upgrade my instance of Ubuntu 16.04 LTS screen keeps on freezing, I have no mouse or keyboard interaction, and the only way to get out of it, is to restart. Also, I have lost sound.  Doing my own research into the matter has failed to find a solution, and I was wondering whether anyone has suffered the same, but who has a solution to share.


If I get stuck on a Codingbat exercise, which Stack Exchange forum would be appropriate for getting assistance so I can understand and move on?

Codingbat.com provides interactive coding exercises, and I'm using it to practice my Java. I do however want to understand where I went wrong with human aid here and there.   Which forum is most appropriate as I don't want to post off-topic?


jQuery cannot select dynamically created elements AFTER calling a function which generated them again

The following is a toy example. At first, it works very well. The bottom shows the same number in the input. However, after clicking the interference button, the bottom display doesn't synchronize the input number anymore. Does anyone know where is the problem? Thanks.

  <button type="button" id="interference">interference</button>


A family member just emailed me to inform me that he did some genealogical research and that we are distant cousins of William Shakespeare (1st cousin 14x removed).  I don't know anything about genealogy at all, but my suspicion is that (even if this is true) given that he was born 500 years ago the chance of being a distant cousin of him is nowhere near as remote as my family member thinks it is or might even be rather likely.  Can any experts confirm this with me?  So what I'm contending is it's not 100% probability to be a cousin of Shakespare fourteen times removed, but the probability is not extremely small either.  Apologies if this is a naive question as I don't know anything about this.


Define amount of space after \newline, \\, or \linebreak

How do I define the amount of vertical space there are after all new lines? I am looking for something that works like this:  \define{x = 4}  blah blah blah blah \\[x pt] blah blah \\[x pt]   Where I can with one modification change the amount of vertical space after all new lines. I don't care whether it uses \\, \newline, \linebreak, or something else.


Is my nearby neighbor's foundation excavation a concern for my home?

Hope someone can answer my Question. I live in Milwaukee WI.My neighbor just informed me she will have to have her basement excavated. The side of her house is 14 feet away from the side of my house. I have a bi-level home. On the side of my home is a finished family room and bedroom. Should I be worried about heavy machinery doing damage to the foundation to my home that could cause problems in the future. Thank You in advance of your answers.


Diacritics and non-English letters in anglicized loan words: keep 'em, dump 'em, italicize the words, or what?

Take an expression like déjà vu. This is a French term which is frequently seen in English. In fact, it is included in English dictionaries. But it is often seen in English in a variety of forms:     déjà vu      déjà vu      deja vu   Now, one would probably not consider using frisson or soupçon, both proper unanglicized French words [uh-oh, see edit], without italics to indicate that they were foreign words. But once anglicized, do the words require non-English diacritical marks? Or, if such are used, does that push the word back into foreign status, so that italics are again required?  There's probably a continuum in operation here, during which a word goes from foreign with foreign markings to English with only English markings (or lack thereof). What I want to know is how one can tell where to draw the line. Does anybody have any useful information about this? Guidelines? Or is it on a case-by-case basis?  Honestly, I feel affected writing à la carte when every damn diner you walk into has an "a la carte" (or "ala carte" or "a la cart") category on the menu.  Edit: For example, see the Free Online Dictionary's  for soupçon:     Soup`con´ n. 1. A suspicion; a suggestion; hence, a very small portion; a taste; as, coffee with a soupçon of brandy; a soupçon of coquetry.   and then in the Thesaurus part:     soupcon - a slight but appreciable amount; "this dish could use a touch of garlic"    So if dictionary entries can't even remain consistent within the same definition, what chance does a mere mortal have?


How to evaluate $\int_0^1 (\arctan x)^2 \ln(\frac{1+x^2}{2x^2}) dx$

Evaluate   $$ \int_{0}^{1} \arctan^{2}\left(\, x\,\right) \ln\left(\, 1 + x^{2} \over 2x^{2}\,\right)\,{\rm d}x $$     I substituted $x \equiv \tan\left(\,\theta\,\right)$ and got    $$ -\int^{\pi/4}_{0}\theta^{2}\,{\ln\left(\, 2\sin^{2}\left(\,\theta\,\right)\,\right) \over \cos^{2}\left(\,\theta\,\right)}\,{\rm d}\theta $$    After this, I thought of using the Taylor Expansion of $\ln\left(\, 2\sin^{2}\left(\,\theta\,\right)\,\right)$ near zero but that didn't do any good.    Please Help!


$ L^{1}$ norm of a continuous non-zero function

Is it possible to get a non-zero continuous function which has zero $L^{1}$ norm?


Using Google CDN to load scripts gives poor user experience in China

Here in China, pretty much everything by Google is blocked by the government. If you request anything from a Google domain, it will give the appearance of loading for a while and then give back a DNS error.  Stack Exchange uses a Google CDN to deliver some scripts, which means that users in China will see Waiting for ajax.googleapis.com... for a while and then the script will fail to load.  I usually press the stop button so I don't have to wait to see the page content, but without the script loaded the actions I can perform are limited; for example pressing upvote/downvote does nothing. I can sometimes post a question or answer, but it seems to redirect to a CAPTCHA more often when the script is not loaded, and   Can we use some CDN that isn't blocked in China, or at least have some sort of fallback to improve the experience for users in China?    EDIT: The answer on  is targetted at people intentionally blocking scripts because of being persnickety about privacy, not because of people not being able to access scripts because of forces beyond their control. The reasoning given there (i.e. being hard to support by choice) doesn't apply here. Furthermore, I am not asking about removing reliance on external scripts in general, I am suggesting that reliance on Google's scripts be resolved because of a significant issue with them in a country with a very large population.


I want to output something like this:     Pew Research Center for the People & the Press. (2008). April 2012 Values Survey [Data file]. Available from Pew Research Center for the People & the Press Web site:    How would I enter that into ? I use BibDesk to manage my citations.


Playing around with SQL Server, I came across a . Essentially, I only need to log into DAC. Is there any general advice for when DAC is needed? How do I know I need it to access sys.sysobjvalues without googling for the error message?  What all does DAC provide access to?


WhatsApp doesn't open on Android 2.3.6 - says "switch to a supported phone"

Whatsapp say app supported to 2020 but won't open from 2018-02-06


How is the behaviour of an atom particles as the atom approaches the speed of light?

There are many questions regarding what it means to accelerate the constituents of an  atom towards to the speed of light, but I am not able to find any cogent article as to what the dynamics of the atom as a whole is.    For example, we know from relativity how a mass or body (made up of atoms) behaves as we approach light speed but that is not the question being asked.  The question is how is the individual atom's behavioural model (e.g. wave equation) changed when accelerated towards the speed of light.


How to make a list of functions in python?

I tried to achieve something like this  list1 = [lambda x: x+0, lambda x: x+1]   by doing this  list2 = [lambda x: x+n for n in range(2)]   But it doesn't work! (Why not?) How do I create a list of functions programmatically?


I am trying to insert a tag like "image id=1" inside a xml feed, and with ids from 1 to 10, but I get wrong XML format error using following code, someone can tell me why?   $line .='<images>' . $crlf;  $i=0; foreach($images as $img)      if ($i < 10)      {         $i +=1;         $line .='   <image id=<![CDATA['.$i.']]>>' . $crlf;           $line .='   <image><![CDATA['.$imageUrl.$img->name.']]></image>' . $crlf;        }    $line .='   </images>   ' . $crlf;         I also tried using   $line .='   <image id='.$i.'>' . $crlf;   and I get xml error......  This is how the feed should look like:  <images>     <image id="1">         <url>http://www.mywebsite/image?id=1&.jpg</url>         <title>             <en>FOTO 01</en>         </title>     </image>     <image id="2">         <url>http://www.mywebsite/image?id=2&.jpg</url>         <title>             <en>FOTO 02</en>         </title>     </image>


DDoS Protection Services - are they good enough?

first of all, I understand that it's better to have DDoS protections on data center level. But our DC is not ready to provide good quality of protection. So we thinking about using some  external DDoS protections service.   I have googled several, like (sorry can not post many links):   http ://blockdos.net/ http ://www.armoraid.com/ http ://www.blacklotus.net/ http ://ddosprotection.com/ http ://www.level3.com/index.cfm?pageID=555   The general idea, is that you are changing DNS to point on DDoS protection service. They filter traffic for you, and then redirect it to your backend. So, it adds some small time overhead, but let you site be alive even under DDoS.  But it's really easy to write something on site. My question is: do anybody have experience with such service? Is it really helping against DDoS?


There is a popular idiom in Russian for describing a really crowded place: "(there's) no room for an apple to fall" ("яблоку негде упасть").   I struggle to think of anything similar in English, and the dictionaries I consulted were of no help, simply translating it as "crowded" or not even including it at all.  The context would be something and anything along the lines of     The place was so crowded that [X].   The room was full to the extent that [Y].   The street/square was [Z].   At the top of the hat charts, there is [no room for an apple to fall].     Which is to say, I am not married to any sentence structure in particular — I'll gladly rewrite from scratch to use a vivid and idiomatic adjective or noun, word or phrase, metaphor or saying, rather than try and shoehorn it into a sentence it does not feel itself welcome in.


Issue with output from an if...else function in python

I am trying to write a function in Python that would return a colour value after evaluating to a user value. This what I have tried, however, I am not get what I expect, a single colour. I am getting a list of colours. I am new to programming.  uservalue = 100000  def colour(m,i):     if uservalue > (m + i):         clrs == "red"                       elif uservalue < (m - i):         clrs == "blue"                   else:         clrs == "white"              return clrs   to test I use this input:  colour(20000, 3000)     output:  ['red', 'red', 'red', 'white', 'white', 'white', 'white']   I was looking for one colour returned after evaluation.


I'm stuck with the last part of this question: solve $x^2 \equiv 140 \pmod{221}$.  We know that $140 = 7 \times2^2\times5$ and $221 = 13 \times 17$.  We split the original congruence in two, so we have:  $x^2 \equiv 140 \pmod{13}$  $x^2 \equiv 140 \pmod{17}$  Applying the properties of moduli we have:  $x^2 \equiv 10\pmod{13} \rightarrow x=\pm6$  $x^2 \equiv 4\pmod{17}  \rightarrow x=\pm2$  After this point, it's not clear for me how I can arrive to the complete solution. Any advice?


kill bash loop executed from command line

I run my command in a loop. I wrote the loop directly to a bash command line:  $ while true; do mycommand; done   mycommand is a command doing a lot of io and waiting for events so it does not consume much processor time.  How can I interrupt the loop? When I press ctrl-c or ctrl-\ then mycommand is terminated but it is started again immediately. When I log in to another terminal and kill the command then the situation is the same.  Is it possible to interrupt the loop without killing the terminal session?


Staying in Schengen after student visa expires

I have a question. I'm a USA citizen with a student visa issued in Sweden that expires on the 30 of June. However, I am planning on leaving Schengen (through Sweden) and returning after the 30 of June to Spain.  Will I be able to enter Spain using my 90 tourist days?  I read that time spent under a residence permit does not count towards those 90 days, however I would like to confirm this.


Destructor is not called in Factory Pattern

I am learning factory design pattern and this is how I have implemented in C++. CVehicle is abstract class having interface createVehical to create actual object of specific type. CVehicalBookingHandler  is client code which will be exposed and needs not to be modified, it will also delete actual vehicle object in it's destructor. But when its destructor is called to delete actual objects, their destructors are not called. How can I fix it??   #include<iostream>  using namespace std;  enum EVehicleType{     VT_Bus, VT_Train, VT_Flight  };  class CVehical{ public:     virtual bool Book()=0;     static CVehical* createVehical(EVehicleType vehicleType); };  class CBus:public CVehical{ public:     bool Book(){         cout<<"Bus is booked!"<<endl;         return true;     }     ~CBus(){         cout<<"CBus deleted"<<endl;     } };  class CTrain:public CVehical{ public:     bool Book(){         cout<<"Train is booked!"<<endl;         return true;     }     ~CTrain(){         cout<<"Train deleted"<<endl;     } };  class CFlight:public CVehical{ public:     bool Book(){         cout<<"Flight is booked!"<<endl;         return true;     }     ~CFlight(){         cout<<"Flight deleted"<<endl;     } };  CVehical* CVehical::createVehical(EVehicleType vehicleType){      if(VT_Bus == vehicleType){         return new CBus();     }     else if(VT_Train == vehicleType){         return new CTrain();     }     else if(VT_Flight == vehicleType){         return new CFlight();     }     else{         return NULL;     } }   class CVehicalBookingHandler{ private:     CVehical* vehicle;     EVehicleType eVehicleType;  public:     CVehicalBookingHandler(EVehicleType eVehicleType):eVehicleType(eVehicleType){         vehicle=CVehical::createVehical(eVehicleType);     }     ~CVehicalBookingHandler(){         if(vehicle){             delete vehicle;             vehicle=NULL  ;         }     }     CVehical* getVehicle(){         return vehicle;     }      EVehicleType getVehicleType(){         return eVehicleType;     } };   int main(){     CVehicalBookingHandler busBookingHandler(VT_Bus);     CVehical* vehicle=busBookingHandler.getVehicle();     vehicle->Book();      CVehicalBookingHandler trainBookingHandler(VT_Train);     vehicle=trainBookingHandler.getVehicle();     vehicle->Book();      CVehicalBookingHandler flightBookingHandler(VT_Flight);     vehicle=flightBookingHandler.getVehicle();     vehicle->Book(); }   output:  Bus is booked!  Train is booked!  Flight is booked!


A problem regarding the proof of ${p^nk\choose p^n}\equiv k\mod p$, where $p\nmid k$.

In , there is a statement where:  $$(a+b)^{p^nk}\equiv (a^{p^n}+b^{p^n})^k\mod p$$ I understand this part. But then it expands both sides binomially, and compares coefficients of $\displaystyle{a^{p^n(k-1)}b^{p^n}}$ to conclude $\displaystyle{{p^nk\choose p^n}}\equiv k\mod p$.   If $k<p$, then none of the coefficients in the binomial expansion of $(a^{p^n}+b^{p^n})^k$ are divisible by $p$. I don't understand why comparing coefficients would give us the answer here.  Thanks in advance!


Put [stack-exchange] in the stack for tag exchanges

It looks like the  tag (later renamed to ) is a holdover from the pre-split days when this site was called Meta Stack Overflow and also served as the meta site for Stack Overflow (in addition to its current purpose). It was intended to disambiguate questions about the SE network as a whole from questions specifically about Stack Overflow (). It has nearly 1,500 uses, so it's too big to clean up manually. It looks like people are still using it on new questions, and I just saw a suggested edit that only added this tag. Since all questions here should be about Stack Exchange, can we burninate this, the ultimate meta tag?


Why does a question appear as modified by the Community user, but when you click on it there's nothing in the question or its answers done by him/it ?


I accidentally removed the default user system, ubuntu, from the sudo group. How can I do to regain root access?  Thanks.


How do I make modprobe changes permanent?

I have been having several issues with my touchpad since upgrading to 12.04LTS.  I believe it is an issue with the Elantech driver.  I have found that the following commands fix my problem, however, the changes seem to be reverted when I reboot.    modprobe -r psmouse modprobe psmouse proto=imps   Is there a way I can make these changes permanent?


Other diophantine equations solved thanks to modularity theorem

The diophantine equation   \begin{equation} x^n+y^n=z^n \end{equation}  is an example of an equation that was not solved before the work of Wiles, and has now been solved through his and other's recent methods. What are other Diophantine equations that were not solved before 1994 and now are, thanks to the modularity theorem?


I have some phone numbers diplayed from database. When i click on that number i have to call that number using skype.I am using a php code.   Call the Skype Echo / Sound Test Service   It works only if the system have skype installation. If computer does not have skype i need a skype installation procedure.  Anyone help me.


I've been playing the game for about a week without issue, but all of a sudden today it stopped earning credits while I am away from the game. My stores are stocked, the game is properly counting down time (projects are getting completed), but the only time the game earns credits/has sales is while I'm actively playing it.  Is anyone else having this issue?  Note: I have the game for Android, and there might have been an update today


What is the main difference between a key, an IV and a nonce?

What are the main differences between a nonce, a key and an IV? Without any doubt the key should be kept secret. But what about the nonce and the IV? What's the main difference between them and their purposes? Is it only that, in literature and in practice, an IV is being used as "initiator" of a block cipher encryption mode which should be unique? And the same property should hold for a nonce as well, but since it doesn't instantiate something we call it a nonce? I.e: in AES-CTR mode the IV is a nonce+counter. And both are put in plaintext format in the beginning of the ciphertext.


How can the antiparticle of Hawking radiation fall into the black hole?

According to the theory, when quantum fluctuations occur near the event horizon, one is absorbed and the other is emitted as hawking radiation But in order to conserve the energy the fallen particle must've been of negative mass We know that negative mass particles move in the opposite direction of the acceleration applied to it, so how can that negative mass particle fall into the black hole in the first place?


If particles are points, then aren't atoms empty space?

Zero dimensional points do not take up space, so then wouldn't everything in the universe be literally empty? Or is there something that I'm missing?


Uncountable well ordered set in $Z^-$ theory.

I want to build an uncountable well-ordered set within the theory $Z^\textbf-$. So, I take $A=\omega$ (exists by infinity axiom) and define $$W:=\{(X,R)\in\mathcal{P}(A)\times\mathcal{P}(A\times A):\langle X,R\rangle\ \text{is a well-ordered set}\}$$  With this I consider the set $T:=W/\cong$ (where $\cong$ is isomorphism relation). Note that $W$ and $T$ are sets by power set axiom. So I define for each equivalence class $[x],[y]\in T$ the order  $$ [x]\leq_T[y]\Leftrightarrow \text{type}(x, R_x)\leq \text{type}(y,R_y) $$  Here, $R_x$ means the order of $x$ that make it belongs to $[x]$.   So, $T$ is well ordered by $\leq_T$ and it is uncountable.  Question: I don't pretty sure if I can build $\leq_ T$ without replacement axiom. Another doubt is, Can I take the $R_x$ without AC?


If $K[X]/I \cong K[X]/J$ with $I \subset J$ then $I=J$?

Let $K$ be a field and $I,J$ are ideals of $K[X].$ Then if $K[X]/I \cong K[X]/J$     with $I \subset J$ then can one say that $I=J$ ?


I'm writing a document in LaTeX, using the package setspace with the onehalfspacing setting.  I'm satisfied with the space between two lines of text, but I can't find a way to start a new paragraph leaving only one blank line: if I leave a blank line in the code, the output starts a new paragraph without leaving a vertical space between the two lines of text; if I use \\ and then leave an empty line in the code, the resulting output presents itself with too much space between the lines of text. Unfortunately, answers to similar questions posted here didn't solve my problem.  Summarising, I want to know how I can leave just an empty line in the pdf output when I start a new paragraph. Can anyone help me?  Edit: I found useful for my purpose this page , posted by Runar Trollet in the accepted answer. This solved my problem. In order to start a new paragraph it's enough to leave a blank line in the code. This will result in output as a carriage return with the new line indented and no vertical space between lines - to be precise, no more than the normal space between them. If you want to leave some space between the end of a paragraph and the start of a new one, just use the commands \smallskip, \medskip or \bigskip before leaving the empty line in the code.


One of three if - cases in a while loop does not seem to work, while the other two do?

I am trying to write a little program in Java that lets the user enter four Strings (username, email, password, passcheck).  The program is supposed to check if these strings fulfill certain conditions in a while loop, which asks the user to enter the strings mentioned above, until they fulfill these conditions.   The program compiles and the first two if cases seem to work fine. Only the comparisin between the two passwords (password and passcheck) seems to be wrong. Even if I enter the same String twice, they do not pass the comparison, and I have no idea why this is.  import java.util.Scanner;  public class Registry {     public static void main (String [] args){         Scanner scanner = new Scanner(System.in);          // Dialogue for the user to fill         System.out.println("Please enter your username (at least 5 characters)");         String username = scanner.nextLine();         System.out.println("Please enter a valid emailadress (an @ is necessary for it to pass.)");         String email = scanner.nextLine();         System.out.println("Please enter two matching passwords, so we can make sure that you entered them correctly.");         String password = scanner.nextLine();         String passcheck = scanner.nextLine();         boolean user = false;         boolean mail = false;         boolean pass = false;          // Error messages within a loop in order to make the user enter valid arguments.         while (user != true && mail != true && pass != true){             if ((username == "" || username.length() < 5) || (username == " " || username.length() < 5)) {                 System.out.println("Username is empty or does not have enough characters! Please enter another.");                 username = scanner.nextLine();             }             else{                 user = true;             }              if (email.contains("@") == false){                 System.out.println("Invalid Mailadress. Please enter again.");                 email = scanner.nextLine();             }              else{                 mail = true;             }              if(password == passcheck){                 pass = true;             }             else if {                  System.out.println("Your passwords do not match. Please enter them correctly.");                 password = scanner.nextLine();                 passcheck = scanner.nextLine();             }         }      } }


What does the number after each command that listed by the apropos command mean? (1-8, pm, ssl, etc)

I was trying to complete an article on . When I run the apropos command, it lists out something like this: fahim@Fahim:~$ apropos delete argz_delete (3)      - functions to handle an argz list crlutil (1)          - List, generate, modify, or delete CRLs within the NSS ... DELETE (7)           - delete rows of a table delete_module (2)    - unload a kernel module flatpak-remote-delete (1) - Delete a remote repository git-branch (1)       - List, create, or delete branches git-replace (1)      - Create, list, delete refs to replace objects git-symbolic-ref (1) - Read, modify and delete symbolic refs git-tag (1)          - Create, list, delete or verify a tag object signed wit... groupdel (8)         - delete a group   After each of the listed commands, there's a number in parentheses. What does that number mean? What's the use of it? Edit: I've seen the answer on man page. To check out that all the numbers are between 1 to 8, I tried this command and some of the results were: fahim@Fahim:~$ apropos a YAML::LibYAML (3pm)  - Perl YAML Serialization using XS and libyaml x509 (1ssl)          - Certificate display and signing utility x509v3_config (5ssl) - X509 V3 certificate extension configuration format X25519 (7ssl)        - EVP_PKEY X25519 and X448 support   The answer about the numbers make sense, but what about these 3pm, 1ssl, 5ssl, 7ssl?


Cut / clear selected region of pdf using Preview

As shown in the screenshot I have selected a rectangular region. I want to clear that section. None of the menu/toolbar items are apt for this task.  Is there a workaround?    Update It was suggested to use the Tools|Annotation|Text and put a white background text . However I see no way to configure the text - including customizing the font, fg/bg color, transparency, etc.  How to do so?  See screenshot.


How will a particle with energy less than $V_{\rm min}$ behave?

Consider e.g. the finite square well: $V = -V_o$ between $x=-a$ and $x=a$, $V=0$ elsewhere  Now for scattering states, $E$ must be $> 0$. For normalizable bound states, $E$ must be $< 0$ and $> V_{\rm min}$ (=$-V_o$ in example).   But if a particle in a lab has Energy which $< 0$ and $<V_{\rm min}$, is it bound or will it scatter?  And I don't know why I haven't thought about this before but what does it mean for a photon to have negative energy?


Change Ubuntu time and date for specific application

Is there any application which can manipulate time and date for any specific application? If I change date and time of system then browser can't let me access internet.  Any help will be appreciated. Thank you


Is it unreasonable to assign a MySQL database to each user on my site?

I'm creating a user-based website. For each user, I'll need a few MySQL tables to store different types of information (that is, userInfo, quotesSubmitted, and ratesSubmitted).  Is it a better idea to:  a) Create one database for the site (that is, "mySite") and then hundreds or thousands of tables inside this (that is, "userInfo_bob", "quotessubmitted_bob", "userInfo_shelly", and"quotesSubmitted_shelly")  or  b) Create hundreds or thousands of databases (that is, "Bob", "Shelly", etc.) and only a couple tables per database (that is, Inside of "Bob": userInfo, quotesSubmitted, ratesSubmitted, etc.)  Should I use one database, and many tables in that database, or many databases and few tables per database?    Edit:  The problem is that I need to keep track of who has rated what.  That means if a user has rated 300 quotes, I need to be able to know exactly which quotes the user has rated.  Maybe I should do this?  One table for quotes. One table to list users. One table to document ALL ratings that have been made (that is, Three columns: User, Quote, rating).  That seems reasonable. Is there any problem with that?


Is it possible to restore a Windows system disk encrypted with BitLocker after format?

I accidentally formatted my Windows 7 OS disk from my secondary OS in a moment of carelessness.  It was an encrypted drive with BitLocker. I have not touched it since the formatting took place. Is it at all possible to somehow undo the format?  More specifically, I am asking about any method which may undo the flags or similar set by the formatting process. As it was a "quick format" and did not actually delete anything, it just marked the whole drive as free.


I'm generating an index value associated with each tuple value :   a = ["what" , "a" , "test"]  c = 0 d = [] for b in a :      d.append((c , b))     c = c + 1  print(d)   generates :   [(0, 'what'), (1, 'a'), (2, 'test')]   Is there Python idiomatic / functional way to implement same functionality ?  Something like :   list(map(lambda x : (x , c+1) , a))


If the solutions to Lorentz equation diverge exponentially, how can they be confined in a strange attractor?

In the book of Chaosbook, at the beginning of chapter 6, it is given that     [...]if the attractor is strange, any two trajectories $x(t) =  f^t(x_0)$ and $x(t)+\delta x(t) = f^t(x_0 + \delta x_0)$ that start   out very close to each other separate exponentially with time [...]   However, we've all seen that the solutions stays in a surface similar to   or   , so any two solutions can't have an infinite divergence because any two of them stay in a surface similar to given above, and those surfaces will have a finite distance between them, so the solutions cannot diverge infinity apart, so am I taking the given explanation to literal, or am I just missing something because that kind of explanation for the Lyapunov exponent is, kind of, given in almost every chaos lecture, so I'm confused.


What is the status of Ubuntu Mobile? Is the project expected to reinitiate in coming years?

With android and Google Play becoming so popular, it would be great to have Ubuntu on mobile devices again.  Some archaic references:


How do address these WARNING's when I open firefox from the terminal?

When I open my Firefox Web Browser from the terminal I get these following warnings.  william@william-AO722:~$ firefox (process:5672): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed (firefox:5672): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::sm-connect after class was initialised (firefox:5672): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::show-crash-dialog after class was initialised (firefox:5672): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::display after class was initialised (firefox:5672): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::default-icon after class was initialised   Is there a way that I can get rid of these warnings?   Also can anyone tell me what GLib is and what is it for?  I am running Ubuntu 13.10


Biblatex only reverses first author's name

I have the following MWE.bib:  @report{MWE,   title = {Testing},   number = {05-0124},   institution = {{tex.SE}},   type = {Working {{Papers}}},   author = {Doe, John and Doe, Jane and Else, Someone},   date = {2005} }   I also have the following .tex:  \documentclass{report} \usepackage[style=authoryear,backend=biber,giveninits=true]{biblatex} \addbibresource{MWE.bib} \begin{document}     \nocite{MWE}     \printbibliography \end{document}   The output I get is:    Why is only the first author's name reversed (Last, First), while the other authors' names aren't? Is there some additional option I need to pass to biblatex?


We all know that $|\mathbb{N}| = \aleph_0$. Since $|\{-1\} \cup \mathbb{N}| = \aleph_0$ as well, I guess you could say that $\aleph_0 + 1 = \aleph_0$.  You can go on to derive that $\aleph_0 + \aleph_0 = \aleph_0$, and by induction $n \times \aleph_0 = \aleph_0$ (assuming that $n$ is finite, anyway).  Now, here's a thing: What is $\aleph_0 - \aleph_0$?  Well, $|\mathbb{P}| = \aleph_0$, and $|\mathbb{P} \backslash \mathbb{N}| = \aleph_0$, so perhaps $\aleph_0 - \aleph_0 = \aleph_0$?  No, wait. Consider the set $S = \{n \in \mathbb{N}: n > 5\}$. Now we have $|S| = \aleph_0$, and yet $|\mathbb{N} \backslash S| = 5$. So maybe $\aleph_0 - \aleph_0 = 5$?  But that is absurd, since we can redefine $S$ to make the result any finite number we wish. Or we can define $S$ such that the result is countably infinite.  Does this mean that the notion of $\aleph_0 - \aleph_0$ simply has no definite answer? Or am I just being too simplistic here?


Where does this convention for quotation marks (`` ...'') come from?

Frequently I get asked the question:     ``K., where does this convention for quotation marks come from? You know, the one with the two grave accents introducing a quoted string and two regular upright single quotation marks ending it?''   I have no idea. Where does this come from?


Dual nationality US/UK, wants to return to the US with only a UK passport

My daughter was born in England and came to America 32 years ago. She is an American citizen. Two years ago she moved to the UK with a British passport. She now wants to return to the US but doesn't have a US passport. She has never had a US passport.  As a US citizen, can she return using her British passport only?


grep --before-context 5 shows 5 lines before the match.  I want to show everything before the match. Doing grep --before-context 99999999 would work but it is not very... professional.  How to show all the file up to the match?


Sci fi TV series about a parallel universe where belts let them stay there and give them power

I'm looking for a TV show that I watched when I was a kid (2000s). It's not Sliders, Parallax, Spellbinder, or Stormworld.  It's about a boy who travels in a group with a girl and an old man (maybe a doctor or scientist), looking for some crystals-ish to fix a machine. They travel with a companion, who is a puppet. They use belts that if they take it out they leave that parallel universe.  In the end, the villain turns out to be the good guy, and the scientist who they are traveling with, the bad. They all take their belts to give power to the protagonist's, and defeat the scientist.


I have an account in Area51, which I want to delete.  I want to delete only that account, not other accounts I have in Stack Exchange.   How can I do that? I tried to contact administrator of the network (area51@stackoverflow.com) but have not gotten any response yet.


Old HTTP links to SE sites without ending / weren't converted to HTTPS links

About a year ago, several migration scripts were run to change old HTTP network-internal links across the network to HTTPS links. However, it appears that the script didn't modify links that lack the ending /. For example:         But...    (most of which are posts after the migration script ran; the other two were edited back after Community edited them)  (4 were posted after the script ran, one seems to have been overlooked by the script)   (only one was posted after the script ran)   So, excluding cases where the posts were made after the script ran, were edited back after the script modified them, or were somehow overlooked by the script (probably a separate bug), all of the HTTP links in posts which were added before the script ran have been converted into HTTPS links, if they contained the ending /. Links that didn't contain the ending / were not converted.


How to resolve this circular dependency?

I have a interface for element that returns the mesh for the current element. I have mesh which is collection of element. The mesh also has reference to mesh because it want to manipulate mesh. When ever I try to compile I get error saying invalid use of incomplete type ‘class Mesh’.  AbsElem.h  class Mesh;  class AbsElem{   virtual Mesh& GetMesh()const = 0; };   Elem1.h  #include "AbsElem.h" #include <vector>  class Elem1 : public AbsElem{    Elem1(Mesh& m):my_mesh(m){}   virtual Mesh& GetMesh() const{return my_mesh;}    void DoStuff(){    my_mesh.GetVal();   }    Mesh& my_mesh; };   Mesh.h  #include "Elem1.h"  class Mesh{   public:    int GetVal(){return 1;}   private:   std::vector<Elem1> collect_elem_; };   main.cpp  #include "Mesh.h"  int main(){   Mesh m; }   compile by : g++ main.cpp  compilation error :       In file included from Mesh.h:1,                    from main.cpp:1: Elem1.h: In member function ‘void Elem1::DoStuff()’: Elem1.h:10:4: error: invalid use of incomplete type   ‘class Mesh’       my_mesh.GetVal();       ^~~~~~~ In file included from Elem1.h:1,                    from Mesh.h:1,                    from main.cpp:1: AbsElem.h:2:7: note: forward declaration of ‘class Mesh’  class Mesh;          ^~~~


Can not get WiFi to work in new install of Ubuntu or Mint

There are similar posts like this but some don't resolve my problem, some I get stuck on certain steps and can't continue forward like this video () at step 1 I get "package git has no installation candidate" then after doing sudo apt install git I see the same thing. And some posts are left unanswered 6 years 7 months later so I'm going to take a wild guess and say this is an ongoing issue. My problem is I can't pick up any wi-fi signals or Ubuntu isn't reading my wi-fi card (not exactly sure what problem is). I installed Linux Mint dual booted with Windows 10 and wi-fi works no problem on Windows. I couldn't figure out how to get wi-fi to work on Mint, got frustrated and though Ubuntu might work, nope, wi-fi still doesn't connect. Is there a input I can use to show someone what my set up is or what you would specifically like to see? (again, sorry I don't know what words to use to describe my issue)  edit:  lspci -knn | grep Net -A3; rfkill list  02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821] Subsystem: Lenovo RTL8821CE 802.11ac PCIe Wireless Network Adapter [17aa:c024] 0: ideapad_wlan: Wireless LAN Soft blocked: no Hard blocked: no 1: ideapad_bluetooth: Bluetooth Soft blocked: no Hard blocked: no 2: hci0:Bluetooth Soft blocked: no Hard blocked: no   and so far, none of the listed websites, githubs, links, workarounds, etc. have solved my issue.


There is a need to send 32 bit numbers between two DSPs in my application.  The receiving and transmitting devices are MCUs supporting 8-bit messages. Is there a standard way to packetize the data? Such as: Message - Payload  0 - start byte 1 - data 2 - data 3 - crc8


If Newton's third law is true, why can we sink in sand?

Newton's third law of motion states that every action has an equal and opposite reaction. That is the reason we do not sink into the earth, because when our weight exerts a force on the earth it also exerts an equal and opposite force on us.  But when we stand on quicksand or on fluids we can sink in. How is this possible? Does it not exert an equal and opposite force on us? Or are Newton's laws different in the case of fluids and substances of low densities?


Alternative to weight-paint and mesh deform rigging?

I'm seeking to evolve from my current and very problematic workflow of using weight-painting to deform meshes. Things usually deform strangely and getting any sort of elegant 'knee bend' or similar body movement awkward, usually giving shrinking deformations I do not want. Problems compound when I try to involve clothes - shrinking, unwanted intersection, etc.  Bending our real-life knee is simple - our skin is wrapped around the bone. One would think this should be easy in 3d? Yet I'm not sure which workflow simulates this. The same principle would be with clothing around the flesh.  Is there a more sophisticated rigging method that is more intuitive?


I found the answer to  interesting in that he referred to a "75 cent word". I would have called it a 50-cent word, not because I undervalued his answer but because that is how I have heard the phrase. I thought at first that am old enough that inflation caused the difference, but  I found a 1976 reference to 75-cent word from 1976, the earliest reference to the phrase I found in a quick ngrams search.  What is the "right" value to use in the phrase "?-cent word" (or, what was the original)? Has it changed over time? Do non-American English speakers have alternative expressions in local currency?


I am running a Ubuntu 12.04 LTS Server on a private network that doesn't and never will have internet access.  I have a need to install packages from time to time for development purposes, and rather than download the .deb files everytime to manual install i would like to create an offline repository in the form of an .ISO that i can present to my VM's in ESXI.   What is the best way to go about doing this? I assume once i have them on a CD i can add the mounted ISO to apt sources.list?


If $G$ is an infinite group, and $A,B$ subgroups of finite index in $ G$, then $A \cap B$ has finite index in $G$

Question: If $G$ is an infinite group, and $A, B$ subgroups of finite index in $G$, then prove $A \cap B$ has finite index in $G$.  I'm trying to show that $A\cap B$ can not have infinite index, but I can't make contradiction. I do not see where the problem in $A \cap B$ have infinite order comes from. I thought this look easy when I first saw it, but now I'm not so sure..I'm sure its true, but do not know where the contradiction comes from.   Thank you for help if you choose to help


How can I render bokeh circles?  Nothing I do seems to work.   I tried using an empty as the focus point for a cube, with some point lamps in the background with about 2000 strength, but it doesn't work. It just makes everything blurry.  I also raised the blades to 4/5/6/12, and it doesn't make a difference.  I'm using Blender 2.74.


Given two entire functions $f_1,f_2$ without common zeros, prove that one can find some entire functions $g_1,g_2$ such that $f_1g_1+f_2g_2=1$

The question  Let $f_1,f_2$ be some entire functions without zeros in common, so for every $z∈ℂ$ we have $|f_1(z)|^2+|f_2(z)|^2≠0$. Prove that there exist two entire functions $g_1,g_2$ such that:  $$ f_1(z)g_1(z) + f_2(z)g_2(z) = 1,\qquad ∀z ∈ \mathbb{D} $$    What I've tried  Lets define: $$ g_1 = \frac{1-g_2f_2}{f_1}$$  If we show that the fraction is entire, then $g_1$ is given as above. But because $f_1$ can be zero at some point, we need to choose $g_2$ correctly to have zeroes where $f_1$ does. In other words: $$ Z(f_1) ⊂ Z(1-g_2f_2) $$  Suppose $f_1(a)=0$, then we need to take $g_2(a)=1/f_2(a)$, and we have no problem with the denominator, since $Z(f_1)\cap Z(f_2)= \emptyset$. Using Mittag-Leffler's interpolation, one can find $g_2$.  My doubts [based on what 308745 says]  As said in , the multiplicity of the zeroes at $f_1$ are a restriction that one needs to deal with. Finally one has to choose:  $$g_2(z) = \frac{1}{f_2(z)} + O((z-z_n)^{m_n+1}), \quad z\to z_n  $$  where $z_n$ is a zero of $f_1$ with multiplicity $m_n+1$. But the Mittag-Leffler's corollary that I have, only states the following:     let $\{a_n\}_{n≥1}$ and $\lim_{n\to∞}|a_n|=∞$, and $\{w_n\}_{n≥1}$ be an arbitrary sequence of complex numbers. Then there exists an entire function $f$ such that $f(a_n)=w_n,\ ∀n≥1$   But in this problem I also need $(1-g_2f_2)^{(j)}(z_n)=0$  for $j≤m_n$.  How can I construct $(1-g_2f_2)$ to satisfy that?


First noticed this over on SO on someone else's profile; they had a long URL in the bio, which made the bio expand beyond its normal size. There's a live example on my profile, but .   This is slightly related to , but it only seems to be implemented for posts and not the profile bio.


I need to round a number's decimal place to a n-number

I need to divide a with b and round that number to a n number of decimals. example : a = 2 b = 52 n = 5 , Solution = 0.03846. I can only use intigers!!  I've been working with decimalformat but I don't know how to make the format custom.  DecimalFormat nstevilo = new DecimalFormat("#.###");//I need to change ### to a n-number.     if(x<y) {     double a = x/y;     System.out.print(nstevilo.format(a));     }   This only outputs #.### because of the format i need to make it #.######- n times of decimal.


Prevent automatic resizing of equation elements

I have the following equation: \begin{equation} E(W) = \frac{\frac{(c\rho)^c}{c!}}{(1-\rho)\sum_{n=0}^{c-1}(\frac{(c\rho)^n}{n!})+\frac{(c\rho)^c}{c!}} \cdot \frac{1}{1-\rho} \cdot \frac{1}{c\mu} \end{equation}  which is rendered as  Is there any easy way to prevent that the nominator and denominator of the main fraction to be each displayed in inline math mode? E.g. I want my summation to look like this  instead of the way it looks right now.


Android Market or Google Play Store for black Pandigital Novel

I'm looking for an easy way to get the Android Market or Google Play Store on my black Pandigital novel. I've searched and searched, but I couldn't find any ways to get either of them. If anyone knows an easy, simple way, please let me know!


Drupal 7 - Dynamic Allowed Values Field Widget

I have a project I'm working on where each content manager/author would have a different set of allowed values on a select input for each node created.  Is hook_form_alter the best method for me to dynamically generate the options?  And what would the syntax kind of look like?


Winter hat showing up in math expressions

Noticed a small bug in Mathematics Stack Exchange, though perhaps it might exist anywhere using MathJax. The winter hat (in this case, "Gimme Space") shows up inside the rendered expressions. I do not know why it is in that expression specifically. The post shown below is .


The following question is a question that confuses my mind long since.  I'm sorry if it looks nonsense.     If mathematicians who had made important discoveries in mathematics such as Bernhard Riemann, Carl Friedrich Gauss, Évariste Galois, Joseph Fourier, Leonhard Euler, Niels Henrik Abel and others had joined today's mathematics olympiads ( for example , IMO)  would they all won the gold medal (perfect score) ?   Should the mathematician who did mathematical discoveries be an Olympiad winner in the past?  These questions can actually be dealt with in $1$ single question.     A person who has not joined IMO, can contribute to mathematics in the future?   Thank you and Best Regards.


I'm interested: What is C#'s analog of std::pair in C++? I found System.Web.UI.Pair class, but I'd prefer something template-based.  Thank you!