This is a follow-up post of .  In the linked question,  has ended with six "Recommend Deletion".  However, the post has not been automatically removed from the site since it had a score of +1 throughout the review.  As a result, Prof. Carl Mummert emphasised the importance of down-voting the review target to be deleted in the comments below the accepted answer of the linked Math.Meta.SE question.  Allowing up/down-voting during review would facilitate the removal of such posts.  Update: review target deleted via votes    Edit in response to comments:    only suggests downvoting, while this question also suggests upvoting. My question also applies to Close reviews, in which  have popped up.  The linked meta question is only about LQ reviews.   Since @ShadowWizard has specifically mentioned LQ reviews, I would like to bring up  in which a high-quality answer receives two "(recommend) deletions" and one downvote (viewable to 2k users) from high-rep users who don't know the field.  Upvotes can protect such answers from disappearing.  Once we see good answers, .  That's part of the SE mechanism.  The suggestions of this post helps users to do so without leaving the review.


I bought this frame in a state off eBay a fair few years ago and have recently got it working again.   I would love to know what make or year it might be. There aren't that many his / her frames I've come across and hardly any with the same tube layout as this.  I only came across one serial number on the frame (top tube) but it was too pitted to make out and has been painted over since. The BB axles have Brampton stamped on them but that's about all I have to go on. Maybe some one knows more?


How to change title format in document class?

Now I have to do this in all my documents:  \documentclass{my} \title{\textbf{\Huge My Article}}   I want to move this formatting to my document class. I basically want to do this and my title will still be bold and huge:  \documentclass{my} \title{My Article}   Is it possible?


I downloaded Chrome, opened with Ubuntu software, but when I press install - nothing happens. In the bottom I get a message - this software comes from a 3-rd party and may contain non-free components. What do I do to install? Is it something in system settings?


I need to solve $\displaystyle \sum_{j=0}^\infty \sqrt{\frac{j!}{j^j}}$  Does this converge or diverge?


Why is a matrix invertible if it can be written as the product of elementary matrices?

I'm just starting to learn linear algebra and I understand Gaussion elimination but I don't understand this proof:    Is the heart of this the fact that all the while when I've been row-reducing matrices to reduced row-echelon form... I've actually been multiplying a matrix by a series of a elementary matrices?  What does the notation $[A\ \ 0]$ mean?  How is the equation $A = E_1^{-1}...E_k^{-1}$ arrived at?


I am working through some questions and I am stuck on the working of this one:  Where the working to the answer is here:  Can someone explain the highlighted section as I can't see where it comes from?


Add an unnmbered section to the table of Contents in Lyx

I use Lyx 2.1, class document : report. I created a general introduction as unnumbered chapter, but at the table of Contents, the introduction does not exist.


A question similar to theorem 2.9.1 in Bartle & Sherbert "Introduction to Real Analysis "

prove that if $a\in \mathbb{R}$ such that $0 \leq a \leq \epsilon,$ for every $\epsilon > 0,$ then $a=0.$ What is the difference between proving this and the following theorem in Bartle, ,  p 28?


Android software updates: How can I tell if I can update a device?

I keep seeing Android devices in shops that state what version of Android is installed. Thence I conclude that not all Android devices can be updated to a current version of Android.  How can I tell before I buy (or even after I buy) if a device can be updated to the newest release or not?  Can Samsung's Android devices usually be updated?  Update: Note that I am not refering to abandoned devices but to current devices available in stores now.


I have a Raspberry Pi 1 and was wanting to install Ubuntu on it. I'm relatively new to both the Pi and Linux, so I was hoping for help on my issue as well as tutorials for the beginners on linux use.  Thank you to anyone who replies! Sorry to be a bother.


SFMC busines rule to auto update all subscribers email address

I have a few subscribers who has changed their email addresses in our system which has been reflected in synchronized data extensions in Marketing Cloud. On email send SFMC is sending email to their old email addresses. Upon investigation, I found that All Subscribers data has not been updated with the new email address for the subscribers who changed their email addresses in Salesforce Cloud (CRM).  Please find below the details for one of the records.  Subscriber Key: 000000000000BBBAA1 New Email address (changed on 13/12/2016): NEW@test.com  Old Email address: OLD@test.com   I have raised a case with SFMC and they came up with a solution to enable the business rule in our account to update the records in All subscribers data as soon as the record is updated in CRM.  Can someone help me to understand the impact of this business rule going forward?


Impact of hyperref, when varioref and cleveref are used

I think I may have found a bug in either hyperref, cleverefoder varioref but can't determine the details any further. If do not load hyperref in the following example, the result is fine.  \documentclass[ngerman]{scrartcl}  \usepackage{babel} %\usepackage{hyperref} \usepackage{varioref} \usepackage{cleveref}  \begin{document}  \section{Erster Abschnitt}\label{sec}  \begin{figure} \rule{\textwidth}{1cm} \caption{bild}\label{bild} \end{figure}  Siehe \vref{sec}, siehe \vref{bild}  \end{document}      If I load hyperref the reference reference to the section cannot be expanded, I get the following error instead:  ! Argument of \@fourthoffive has an extra }. <inserted text>                  \par  l.19 Siehe \vref{sec}                      , siehe \vref{bild} ?      Any idea from which package this error may result?


Are chapter headings and other semantically smaller parts as the title capitalized?

I found the question  Regarding the number of answers votes and also according to my personal taste I like to capitalize titles. But what exactly are titles? Only the single main book title? What about other smaller semantic parts? Chapter headings, sub-chapter, ...


Can you cast a quickened spell into a ring of spell storing?

Scenario is my party's rogue has a ring of spell storing, I tend to give him Green Flame Blade and Booming Blade to use in conjunction with his sneak attack.   Can I also fill the ring with Quickened GFB and BB so he can use his bonus action to get another swing in?  Or would the quicken effect wear off inside?


What should be taken into consideration when mixing Fluxx sets?

What should be taken into consideration when mixing fluxx sets?   I played a game of Stoner and Zombie fluxx mixed the other day, and I found it super fun. It add variance to the theming, and especially with the Stoner fluxx (if you're playing with the, ahem, special rules) and stretches it out.   What are the potential pitfalls of mixing sets, and what else should be taken into consideration?


Are both of these statements grammatically correct?  Do they have different connotations?  Or are they interchangeable?   Alice grew far slower than Bob Alice grew far more slowly than Bob


How to search multiple search patterns from a file with grep

If I search for multiple search strings in grep : usually just do:  grep "search1\|search2" somefolder/*.txt   but, what if I have 100 or more search strings? Can I say like this:  grep "stringPattern.txt" somefolder/*.txt   where stringPattern.txt is a file containing a list of words I need to search in *.txt.


iPod - How to display the battery remaining as a percentage?

How can I display the remaining battery power as a percentage on an iPod Touch 5.


I want to calculate the limit of $\lim_{x \to +\infty} (\sqrt{(x+a)(x+b)}-x)$

I want to calculate the limit of: $$\lim_{x \to +\infty} (\sqrt{(x+a)(x+b)}-x) $$ $$(a,b ∈ R)$$  Now I know the result is $\frac{1}{2}(a+b)$, but I am having trouble getting to it.


Why a linear numerator for fractions with irreducible denominators?

For example: (2x^3+5x+1)/((x^2+4)(x^2+x+2)) breaks down to (ax+b/(x^2+4))+(cx+d/(x^2+x+2)). I have been told that since the denominators are irreducible, the numerators will be either linear or constant. Now my question is for something like (2x^3+5x+1/(x^2-4)) you would make it equal (A/(x+2))+(B/(x-2)), why do assume that the numerators are constant? Why couldn't the numerators be linear like the irreducible one?


java system tray duplication or same application runs multiply parallely

when user runs the application twice or more in the system tray number of running same application increases , this creates parallely multiply running on same application how to handle this?   Here is the picture to understand what I am talking about:


I am in middle school. I have spent a month (about) teaching myself the basics of linear algebra. I am having geometry this year in school (I had algebra 1 last year) and I've also taught myself a bit about quantum computing. I'd like to teach myself about quantum mechanics, and I was wondering the following things:   Are there any other things I should study besides linear algebra? What is absolutely necessary to know? What are some good resources for self-teaching quantum mechanics? I am able to read through decently complicated books; I taught myself some linear algebra out of a textbook, but also the simpler/clearer the better.   I would like to be able to handle at least a decent portion of the math behind it, as well as an intuitive understanding. I'm willing to devote a decent amount of time to this project.  Any help would be appreciated.


HTTPS security warning for sub subdomains

I have an apache 2 server and I a wildcard https certificate for all my subdomains. But I do not have one for sub subdomains.   Here's an example:  https://example.com = secure https://wildcardsubdomain.example.com = secure https://www.wildcardsubdomain.example.com = warning unsecure   I am trying to do a mod_rewrite to get rid of any trailing wwws.  RewriteEngine On RewriteCond %{HTTP_HOST} ^www\.(.+) [NC] RewriteRule ^ https://%1%{REQUEST_URI} [L,R=301]   But I found out I cannot rewrite before the security check. How can I overcome this issue and move from the www. to the non www.?


How to get centerline of each polygon (rectangles) in QGIS

How to get centerline of each polygon (rectangles) as in Figure 1 in QGIS to obtain centerlines as in Figure 2  Figure 1  Figure 2


How to change the text color on UINavigationBar button items

I've got a UINavigationController and i've changed it to white using the Tint property of the navigation bar in Interface Builder. But the text in buttons and the title is still the default color, white, and so gets lost against the white background. Anyone know how to work around this?


Propagating uncertainties with trigonometric functions

I have $$\tan (\frac{2.05 × 10^{-4}± 2.89 × 10^{-6}}{2})=\frac{x}{667.6 × 10^6}$$   $$\therefore x = (667.6 × 10^6) \cdot \tan(\frac{2.05 × 10^{-4}± 2.89 × 10^{-6}}{2})$$   As described in the title, I am trying to find the absolute uncertainty. Please include working out.


Why does decreasing the wavelength of light while maintaining intensity decrease current in photo electric effect

I understand a photon with a smaller wavelength is more energetic so for a given intensity, less photons are incident on the electrons and so less photo electrons reach the detector per second. However, isnt current the rate of change of charge? If we have more energetic photons, the photoelectrons have larger KE's. They should be arriving more frequently at the detector. Does this not increase the current?  Why does the current necessarily decrease if the wavelength of incident light is decreased, with the sources intensity fixed. Does the decrease in photoelectrons produced win over the increased rate of arrival? Is there any mathematical model for this?


Using Rouché prove that $a_0\geq a_1 \geq ... \geq a_n > 0$ the polynomial $P(z)=a_n z^n + ... + a_1 z + a_0$ has no roots $|z|<1$

As asked in the title I am trying to prove this using Rouché's theorem. But I am having a hard time trying to find a second polynomial $f(z)$ such that   $$|P(z)-f(z)| < |f(z)|$$  on the unit circle. Could somebody help me out? I would specifically like to see a proof using Rouche's theorem.


Suspicious GET request running in background in interval using iexplore.exe

When I was running fiddler I've discovered that I have a suspicious GET request running in background that's using iexplore.exe. It runs every couple of seconds and has encoded data in the request URL  One of the requests:   http://136.243.24.246/H7giAGAb/nJO4fqhPN6Q0UaltIOnMwqpGp2YnmvJeK34G1j3FP7Mh20+HQ+JSX2MdaWMkMtdTgfIzJgZM/ZcbB7HhdSMwLAC30LyZSgi5UFEXeDr+gqxX7LLdeYrZwQRIKjynuRhCirWGQGkj1uAkwL5A2EpWP4`   By looking at the contents of the IP in the browser it doesn't look like it's something "official" of Internet Explorer.  What can it be and how can I decode that request? My guess is that it somehow steals my data.    ADDED:  I did some further digging and it seems like it's because of m.exe malware:      Still, is there any way to decode the message?


The contents of jars of honey may be assumed to be normally distributed. The contents, in grams, of a random sample of 8 jars were as follows:  458, 450, 457, 456, 460, 459, 458, 456  a) Calculate a 95% confidence interval for the mean contents of all jars:  95% CI:  x̅ = 456.75 Sx: 3.059 n = 8 ν = 7  using calculator: Multiplier = 2.365  95% CI = 456.75 +- 2.365 x (3.059)/root(8)  = (454.192, 459.308).  b) On each jar it states `contents 454 grams.' Comment on this statement using the given sample and your results to part a):  Evidence from part a) shows that the mean is above 454g, but some jars will contain less.  c) Given that the mean contents of all jars is 454 grams, state the probability that a 95% confidence interval calculated from the contents of a random sample of jars will not contain 454 grams.:  Really not sure how to do this, any hints/help?


How to calculate the total number of functions that possess a specific domain and codomain?

I am having difficulty understanding the answer to this question.  How many functions are there with domain $A$ and codomain $\{0, 1\}$?  $A = P(\{1, 2, 3, 4\})$.  $|A| = 2^{|{1,2,3,4}|} = 16$, so there are $16$ possible inputs.  For each of these inputs, we can choose whether to map them to $0$ or $1$. So there are $2^{16} = 65536$ such functions.  I understand the first part ($2^4=16$), but the second part ($2^{16}$) is a little bit confusing to me.


Would an iPhone delete text messages by itself?

Would an iPhone 3G delete text messages by itself? I have lost some text messages and don't know where to find them! Thanks.


Counterspell a counterspell while casting my own spell, 5E?

Cast fireball, have it counterspelled, can i counterspell the counterspell with my reaction?    Need specifics from the book.


upgrade ubuntu without upgrading plasma4

I want to upgrade to the newest version of ubuntu but I don't want plasma5 KDE desktop. is there a way to do the upgrade without sorting through a few thousand packages and dependencies?  my question is different because I want to prevent the upgrade of the entire desktop environment, but allow the base system to upgrade.this involves several hundred files and dependencies that keep trying to remove the entire desktop. (the change from plasma 4 to plasma 5 a completely new desktop evnroment, like going from kde to gnome).  look at my answer this is not a duplicate question. this process involved 600 packages. sorting by hand took 3 hours.and would be impossible to do by command line holds


With my previous bike I followed the general recommandation for maintainance of drivetrain.  This usually goes like the following: replace chain every 3K Kms, replace rear cassette every 6K Kms and after 22K Kms I replaced the chainring as it started to show shark fin teeth.  I am asking what is the most effective method to maintain the drivetrain, does the above procedure which involes quite a bit of money and labor ( not to mention that I have to get my hands dirty with grease in the process ) or simply use the drivetrain until starts malfunction at which point simply replace all the parts: chain, cassette and chainrings?  Supposing that first sign of malfunction would appear after 11K kms ( half of what I got with previous method ), I could replace the wholedrive train and get another 11Kms at lower cost, not to mention that I don't have to get my hands dirty and I do the procedure only once compared to seven times.  Would the approach work? If so, why do get other recommandations in media, books, etc?  Edit  I feel that one can answer the question if we could somehow look at a chart that plots the performance of the drivetrain compared to the distance used. As some suggested performance would include power transfer efficiency, probability of hazards, noise, shifting, etc.  As I see it chain skipping has a high probability of hazards as it could fall of and cause the rider to crash, so that would score something like 9 out of 10 for probability of hazards while a new chain would still score something like 1 out of 10 ( there are chains that brake brand new ).


Ubuntu 14.04 won't boot after installation

Here's the story, I have windows 7 on my Pc and I just installed Ubuntu 14.04, here's how I've done it:   Went in Windows and made some unallocated space in order to install ubuntu there. Installed ubuntu there using the something else method ( I have made a ext4 partition for ubuntu and a swap partition ). Everythings done I restart.   Problem is, now that I have installed it I can't access it.When my pc boots up it directly boots in windows and also in it's boot options there is none that could boot me into Ubuntu.  I've seen some solutions using boot-repair and such but they don't seem to work anymore in 14.04.   So how can I make it to Dual-Boot both Windows and Ubuntu ?  Update  Due to the fact that I have installed ubuntu from an USB I tried the following lines:  sudo grub-install /dev/sdX sudo update-grub   I used sd4 ( the place where I installed Ubuntu ) instead of sdX.Sadly after the first line it gave me the follwing error : "Failed to get the canonical path of '/cow' "    I have tried the possible duplicate solution and here's what I get.  ubuntu@ubuntu:~$ sudo mount /dev/sd4 /mnt mount: special device /dev/sd4 does not exist ubuntu@ubuntu:~$ sudo mount /dev/sda4 /mnt ubuntu@ubuntu:~$ sudo mount /dev/sda4 /mnt/boot ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt /dev/sda4 Installing for i386-pc platform. grub-install: warning: File system `ext2' doesn't support embedding. grub-install: warning: Embedding is not possible.  GRUB can only be installed in     this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged.. grub-install: error: will not proceed with blocklists. ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt /dev/sda4 Installing for i386-pc platform. grub-install: warning: File system `ext2' doesn't support embedding. grub-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged.. grub-install: error: will not proceed with blocklists. ubuntu@ubuntu:~$ sudo grub-install /dev/sda4 Installing for i386-pc platform. grub-install: error: failed to get canonical path of `/cow'. ubuntu@ubuntu:~$    Sda4 is a Ext4 partition however so I don't understand why it sais Ext2.


Button created with jQuery/JS, don't react to click

I'm trying create a list of Messages a user can type in an textarea on the site and delete any of them using a button he automatically creates with each message.  My idea is that I create a div in which I first put the message of the user in and then prepend the button with the same ID of the div; This way I call the ID of the button and remove all elements with the same ID.  <script> var theButtonId = 1; $(document).ready(function() { $('#commentButton1').click(function() {     var toAdd = $("textarea#commentTextarea1").val(); //Content to add     var theId = "dieButtons"+theButtonId.toString(); //creating unique ID      // Adding first Div           $('#targetField').append(          $('<div />', {             id: theId,             }));     // Adding content     $('#'+theId).append(         $('<div />', {              text: toAdd              }));     //(-----1-----)Adding Button             $('#'+theId).prepend(          $('<button />', {              type: 'button',              id: theId,              class: 'commentButton2',              text: "-"              }));     theButtonId++;     }); }); //Button Command $(document).on("ready", function(){   //(-----2-----) $('.commentButton2').on("click", function(){      var thisId = $(this).attr("id");        $("#"+thisId).remove(); }); }); </script>   It perfectly lists the elements in the #textfield  I added a button directly in my HTML code which deletes certain divs, as well as itself using the code above. This is why I know that the Problem is that the created Buttons at (-----1-----) don't react to the command in (-----2-----)  I already tried to create an Input of type button and put a .click function instead of .on("click", [...]).


How to plot binary vs. categorical (nominal) data?

I am building a machine learning model for a binary classification task in Python/ Jupyter Notebook. I am currently in the "Exploratory data analysis" phase and try to create multiple plots/ graphs for my data set. My data set consists of 20 columns (19 features and 1 labeled target). Each row in my data set represents a person. There are many categorical/ nominal features in my data set and only few numerical/ continuous ones. Unfortunately I cannot upload the real data set, so I will create a dummy one.     personID age car TARGET_happiness     1 27 ford 0   2 41 tesla 1   3 55 bmw 0   4 34 tesla 1   5 62 ford 1   6 38 ford 1   7 51 bmw 0   8 46 tesla 1   9 72 bmw 0   10 59 tesla 0   11 48 ford 0   12 51 bmw 1     My aim is to create a plot/ graph to visualize the relationship between the binary variable TARGET_happiness (meaning "is the person happy?") and the categorical variable car (meaning "which car does this person own"). The plot I've used for binary TARGET_happiness vs. continuous age is a box plot, see:  This seems fine. Now I also try to use a box plot for binary TARGET_happiness vs. categorical car:  I'm not sure if this plot is useful / appropriate. Sure, you can see that Tesla owners seem to be happier than BMW owners. But the box for Ford owners looks strange. Which type of plot/ graph can I use to better visualize the relationship between binary and categorical data?


I was wondering if anyone could suggest software/packages to create nice knot diagrams (hopefully with a link to images they have made in the past).  I have used xy-pic recently but am mainly interested in hearing about other options.


My hosted server is being used to DDoS using LDAP, how do I stop it?

I recently was told to manage our exchange server because the person responsible left without decent warning. I have next to no experience in this regard, however everything was running smoothly for a few months.  Our hosting provider just sent me this message:  We observed machines under your control participating in a DDoS attack targeting Google IPs.  The attack was a UDP amplification flood. Your participating machines are listed below, along with the start and stop times in UTC and their approximate bandwidth during that time.  'Server Name'  +-----------------+----------+------------------+------------------+------+ | reflector ip | protocol | first seen (utc) | last seen (utc) | Mbps | +-----------------+----------+------------------+------------------+------+ | 000.000.000.000 | LDAP | 2017-09-29 07:24 | 2017-09-29 07:32 | 66 |   Note that this attack does not indicate the machines have been compromised by the attacker. Instead, it just indicates they are running a UDP protocol that is vulnerable to abuse. If possible, we recommend disabling unnecessary services to protect your devices from data exposure, and also to conserve bandwidth.   How do I go about to prevent this protocol abuse without affecting our exchange service?  I am not a network engineer or familiar with server hosting, so I have no idea where to start, so any help is appreciated.  Edit to answer why not duplicate:  This question aims at specifically stopping the protocol abuse and this question could apply even if the server has never had a compromise nor been taken into production.


In the thread "Difference between field and wavefunction" is explained very well what are they from formal mathematical point of view and how trough second quantization one gets QF from WF. But there is not treated the issue of transition from epistemology (WF especially in Copenhagen interpretation) to ontology (QF-quantum fields) I can not see how the second quantization (a mathematical procedure) raises wavefunction (an epistemological construct) in QM which is loosly speaking square root of probability (very strongly stated in standard QM) to an ontological object a real existing thing e.g. QF  underlying everything. I can not find such Statement in QFT books which start with QM wavefunction but this Statement is widely popularized by some physisists. May it that the WF is an emerging phenomenon due to reality of the QF? Than WF should not be considered very strange?


What should a rational person accept as a miracle?

I was reading  which was suggested to me in a response to . On p. 2, in an article entitled "Unlikely," Laurence M. Krauss, a professor of physics and astronomy at Case Western Reserve University, says:     "Of course, nothing would stop science from uncovering positive evidence of divine   guidance and purpose if it were attainable. For example, tomorrow night if we look up at the stars and they have been rearranged into a pattern that reads, “I am here,” I think even the most hard-nosed scientific skeptic would suspect something was up."   This, as I understood, means that for physicists, maybe, and only maybe a phenomenon like stars lining up in "I am here" fashion, can be regarded as a miracle. Then I thought: is there anything special in nature that can cause a rational person to think of that phenomenon as a miracle?   What should a rational person consider as constituting a miracle? For example, if someone appears now and brings dead people back to life, why should a rational person believe his/her action as a miracle? Maybe because he can't do the same, or because he knows that returning a dead person back to life is impossible, or maybe he/she doesn't accept that action as miracle.


Footnotes not appearing in makecell used in longtable

I am using a footnote inside makecell inside a longtable and while the footnote's counter is displayed, the text does not appear at the end of the page. Here's a MWE  \documentclass{article}  \usepackage{longtable} \usepackage{makecell}  \title{A longtable example}  \begin{document}  \begin{center} \begin{longtable}{|l|l|l|} \caption{A sample long table.} \label{tab:long} \\  \hline \multicolumn{1}{|c|}{\textbf{First column}} & \multicolumn{1}{c|}{\textbf{Second column}} & \multicolumn{1}{c|}{\textbf{Third column}} \\ \hline  \endfirsthead  One & \makecell{abcdef\footnote{Test2} \\ ghjijklmn} & 123.456778 \\  \end{longtable} \end{center}  \end{document}


Understanding how passing value/reference to a function works in Java 8

So this is my code:     File A.java   package test;  import java.util.Arrays;  public class A {      static int[] test;      public static void main(String... args) {          test = new int[2];         B.function(test);         System.out.println(Arrays.toString(test));     } }      File B.java   package test;  public class B {     static int[] function(int[] array){         array[0] = 1;         array[1] = 2;          return array;     } }      Output:  [1,2]   I am not able to understand how exactly does this of code works. I am passing a variable called "test" to a function whose parameter is int[], and parameters are treated as local variables, as far as my understanding goes. So how does a change made to a local variable reflect in the actually passed variable?


Batch Rename (remove specific character) Files

I have about 3500 recorded phone calls and they are all labelled   yyyy_mm_dd_hh_mm_mobilenumber.3gp  I want to remove the underscore from the name so searching through them is easier  How would I do this, i.e which program or caommand is the easiest to do this.  I am using Windows 7.


How to prevent RGB composite flatten to 1 band after raster calculation

I have a series of landsat wanting to process in raster calculator, but after doing the tool it happened these output images only contain one single band. They used to be RGB 3-band images.  It is on arcmap 10.3. I was using raster calculator to remove a certain value in my 3-band landsat image. After I type in the conditional statement to remove all 0 value from the inpur RGB image, it only returns an image of 1band, black and white. How can I preserve the RGB value in output.


The update process gets to 6.72 MB/20.3 MB and gets stuck. Updating from sfdx-cli/5.7.6-d42cf65 (windows-amd64) go1.7.5 sfdxstable to sfdx-cli/6.0.16-3780698 (windows-x64) node-v8.6.0. I have uninstalled the Heroku client and reinstalled the SFDX client as well. In one of my version queries Git-bash printed an EOF error (update was happening in a separate process). It seems like it has some issue with Heroku CLI?   When I try to do an explicit update I see the progress and when it gets stuck the process stops using CPU time:   Let me know if I am missing something or if you know what can be done. Thanks in advance.


How can I fix this error in my Java game?

I have a little bit of programming experience in web development languages such as HTML, CSS, JQuery, JavaScript, PHP, Python etc., but I am no taking an AP Computer Science class at school to learn Java. To see how similar it is to other languages in both syntax and how to go about different problems I decided to make a simple blackjack game that i have made in other languages before.   I have run into and error where I want to check to see what the user has input, and if it is a certain character, output different things such as a help sentence, welcome message, or just simply start or stop the game. For some reason it reads the input and I can log it to the console but it will not run the methods that I have created and called in the if statement inside the while loop. I am going to post the whole script since I have only been programming in Java for 2 weeks or so now and have no idea where my error could be.  import java.util.Scanner;  public class testClass {  public static void main(String[] args) {      Scanner kbd = new Scanner(System.in);     // Creates a scanner to get input from the keyboard      boolean gameStart = false;     // starts false, turns true when 'B' is input      welcome();     //displays the welcome message      while (true) {         // loop to play the game          String input = kbd.nextLine().toUpperCase();         // gets the next input from the user          if (input == "B") {             // checks the users input              gameStart = true;             // 'turns on' the game              double[] hand = drawCards();             // makes an array of 2 cards             System.out.print(input); //REMOVE          } else if (input == "?") {             // checks the users input              help(gameStart);             // displays the help message depending on if the game has started or not             System.out.print(input); //REMOVE          } else if (input == "Q") {             // checks the users input              System.out.print(input); // REMOVE             break;             // ends the game loop          } // ends if      } // ends while   } // end main  public static void welcome() {     // displays the welcome message      System.out.printf("Welcome to blackjack! %nEnter 'B' to begin. %nEnter '?' at any time to see help %nEnter 'Q' at any time to quit %n => ");     // the welcome message  }  public static void help(boolean gameStart) {     //displays the help message      if (gameStart) {          System.out.printf("Enter '?' at any time to see help %nEnter 'Q' at any time to quit %nEnter 'H' to hit %nEnter 'S' to stay %n => ");         // the help message when the game has already started      } else {          System.out.printf("Welcome to blackjack! %nEnter 'B' to begin. %nEnter '?' at any time to see help %nEnter 'Q' at any time to quit %nEnter 'H' to hit %nEnter 'S' to stay %n => ");         // the help message when the game hasn't started      }  } //  end help  public static double randCard() {     // creates a random card      double card = Math.round(Math.random() * 10);     // number 1-10      if (card == 10 || card == 0) {         // no cards at 10 or 0          double x = Math.round(Math.random() * 10);         // variable used to choose J Q K or A when card is 0 or 10          if (x < 3) {             // Jack             card = 11;         } else if (x < 5) {             // Queen             card = 12;         } else if (x < 7) {             // King             card = 13;         } else {             // Ace             card = 10;         }       }      return card;     // returns a single card  } // end randCard  public static double[] drawCards() {     //creates 2 random cards and returns an array      double card1 = randCard();     double card2 = randCard();     // stores the 2 random cards in variables      double[] cards = {card1, card2};     // places the 2 random cards in an array      return cards;     // returns the array of cards  } // end drawCards  } // end class


Give an example of fields $k\subseteq K\subseteq L $, and $l\subseteq L$, for which $l/k$ and $L/K$ are algebraic, $k$ is algebraically closed in $K$, and $lK = L$, but $l$ is not algebraically closed in $L$.   This question has already been posted here , but has not yet had an answer, the truth is that I can not find such an example, could someone please help me? Thank you very much.


How to install firmware-mod-kit in Ubuntu 14.04

i'm newbie in Ubuntu.  after installation Ubuntu 14.04 , i want to install firmware-mod-kit  tar.gz but i don't do that.  explain me step by step command to install for tar.gz , please.


Prove that there exists no sequence of independent events $A_1, A_2, \ldots$ such that $\mathbb{P}(A_i) = \frac{1}{2}$ for all $i

Let $(\Omega, \mathscr{F}, \mathbb{P})$ be any probability triple where $\Omega$ is countable. Prove that it is impossible that there exists a sequence $A_1, A_2, \ldots \in \mathscr{F}$ of events which are independent and such that $\mathbb{P}(A_i) = \frac{1}{2}$ for all $i \in \mathbb{R}$.  We have a theorem: Theorem 2.4. let $A_1, A_2, \ldots \in F$ for some $\sigma$-algebra $F$. If $\sum_{n=1}^{\infty} \mathbb{P}(A_n) = \infty$ and $ \{A_n; n \geq 1 \}$ are independent then $\mathbb{P}(A^*) = 1$, with $A^* = \limsup A_n$  I tried the following but I don't know if its correct. We have that $\sum_{n=1}^{\infty} \mathbb{P}(A_n) = \sum_{n=1}^{\infty} \frac{1}{2} = \infty$, and also the $A_n$ are independent. However, $\mathbb{P}(A^*) = \mathbb{P}(\limsup_{n \to \infty} A_n) = \frac{1}{2} \neq 1. Contradiction.$


If you have a projectile with these variables. $x_0 = 1v_{0x} = 70, y_0 = 0, v_{0y} = 80, a_x = 0, a_y = -9.8$ I know how to plot these points with this equation. $$ x = x0 + (v_{0x})t + 1/2((a_x)t^2) $$ $$ y = y0 + (v_{0y})t + 1/2((a_y)t^2) $$  I want to add air resistance to this problem and i know its a sphere, so the drag coefficient is 0.47, and lets say the area is 0.5. I use this equation to find the resistance.  $$K = 1/2*C_p*A_p$$ where $C_p$ is the drag coefficient and $A_p$ is the area of the sphere. I then try to find the velocity of x and y by using these equations. $$F_dx = KV^2_x$$ $$F_dy = KV^2_y$$ I then plug these in back into my initial x and y equations $$ x = x0 + (v_{0x})t - 1/2((F_dx/m +a_x)t^2) $$ $$ y = y0 + (v_{0y})t - 1/2((F_dy/m +a_y)t^2) $$  I am having a hard time getting the right numbers and pictures when i use these equations. Am i doing something wrong here? Will someone please help me. I would really appreciate any help.


Show that the set of all infinite subsets of $\mathbb{N}$ has cardinality greater than $\mathbb{N}$

Is there any way to solve this problem using the diagonalization method? I know there's the proof that uses $\mathcal{P}(\mathbb{N})$ = set of all finite subsets $\cup$ set of all infinite subsets, but I'm trying to solve it using the diagonalization method specifically. I was thinking that we can assume the two have the same cardinality and arrive at a contradiction, but I don't know how to get there. How can we show there has to be some infinite set in the set of all infinite subsets that cannot match 1-1 with a natural number?


So, why'd he have a child in the first place?

In The Cursed Child,      Delphi is revealed to be Voldemort's daughter.   As she explains:      Delphi:  I am from the future. The child of Bellatrix Lestrange and you [(Voldemort)]. I was born in Malfoy Manor before the Battle of Hogwarts. A battle you are going to lose. I have come to save you. (Harry Potter and the Cursed Child - p.307 - Little, Brown - Act Four, Scene Eleven)   But why? Why did     Voldemort, of all people,   have a child in the first place?     He does not love, he considers himself supreme, he is arrogant, he does not need a right-hand man/woman, and he has absolutely every intention of immortality. Even with the Potter boy chipping away at his Horcruxes, surely he would feel no need for an heir?


Prove that $\ln x$ is not uniformly continuous on $(0,1]$.  Got all confused on how to prove this kind of things... Any hints would be great!


Bash/Korn shell script edited on Windows throws error '...^M: not found'

I wrote a Bash script in Windows using Notepad++.  cxStopAllServicesOnSERVER.sh  #!/usr/bin/bash cd "/some/path" echo "Hi. Logs can be found at "`pwd`"/cxStartStopLogger.log" echo "["`date`"]*** STOPPING ALL SERVICES ON SERVER ***" >> "cxStartStopLogger.log" exit   Now after uploading it and setting the required file permissions, I tried executing it as follows:  bash-3.00$ cat cxStopAllServicesOnSERVER.sh #Let's have a look at the code. #!/usr/bin/bash cd "/some/path/" echo "Hi. Logs can be found at "`pwd`"/cxStartStopLogger.log" echo "["`date`"]*** STOPPING ALL SERVICES ON SERVER ***" >> "cxStartStopLogger.log"  bash-3.00$ # Code and hashbang 'looks' correct,  bash-3.00$ # if there is any issue with the format (EOL characters and such)  bash-3.00$ # we cannot see it using cat. bash-3.00$  bash-3.00$ sh cxStopAllServicesOnSERVER.sh cxStopAllServicesOnSERVER.sh[2]: /some/path^M:  not found Hi. Logs can be found at /some/path/cxStartStopLogger.log bash-3.00$ # Note that ^M appears at the end of the line.  bash-3.00$ bash -x cxStopAllServicesOnSERVER.sh + cd $'/some/path\r' : No such file or directory1.sh: line 2: cd: /some/path ++ pwd ' echo 'Hi. Logs can be found at /some/path/cxStartStopLogger.log Hi. Logs can be found at /some/path/cxStartStopLogger.log ++ date + echo '[Sun' Nov 18 00:28:17 EST '2012]*** STOPPING ALL SERVICES ON SERVER ***' bash-3.00$ # Note that '\r' return character appears at the end of the line.   Problem: When I change the code to korn shell I face the same issue. Appears that an incorrect character is getting added at the end of the line.   NOTE: I found the solution and have posted the same as an answer. Feel free to update or improve it to help other beginners that may face the same issue.  Thanks!


Is it possible to have a perfectly black material?

After reading  about the "blackest material", the following stuck out to me.     The tiny gaps between the tubes absorb 99.5 percent of the light that hits them   Is it possible to create a material that absorbs, not just all visible light, but all electromagnetic radiation?


Easiest way to extract the contents of many folders at once?

In Windows 7, I have a directory of folders which each contain files as their contents.  Is there any way to extract all of the contents of each the folders to a separate location other than cutting and pasting the content one folder at a time?


I remember there's a redirect function in jQuery.  It was like:  $(location).href('http://address.com')   But what was it exactly? I couldn't remember and can't find it using Google Search.


I had Ubuntu 16.x and Kali on my drive. Now I want to delete Kali and instead install Windows 10.  Accidentally I deleted Ubuntu in the Windows 10 installer, and closed it hoping it wouldn't save the changes. But it did and now I am getting the GRUB rescue screen. It shows dev/sda when selecting a partition in the Ubuntu installation GUI  Can I somehow restore the Ubuntu partition or is it gone from the partition table and the system for ever?


When I play a game on my pc, the frames are like 100-130. On Xbox one - PS4 there are some games 30-60fps, 60 frames on pc would be so stuttery. Is there a difference in the console's fps, and the pc's?


when can we remove 'that'? I've heard different opinions  I bought the book that is required for this course I bought the book required for this course  I recommend that you take my advice I recommend you take my advice  I know that you are correct I know you are correct  the report that was approved by the board was written by Susan the report approved by the board was written by Susan  We are studying advertisement strategies that other companies use to recruit minorities We are studying advertisement strategies used by other companies to recruit minorities


How to calculate $\int\frac{x}{ax+b}$ dx ?  I know $\int\frac{1}{ax+b}$ dx but when there is $x$ at the numerator, I don't know where to begin


I use Ubuntu 20.04 running with Kernel version 5.7.0. I want to run older version of Kernel (5.5.0) and so was downloading the packages: cd /tmp/  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/linux-headers-5.5.0-050500_5.5.0-050500.202001262030_all.deb  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/linux-headers-5.5.0-050500-generic_5.5.0-050500.202001262030_amd64.deb  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/linux-image-unsigned-5.5.0-050500-generic_5.5.0-050500.202001262030_amd64.deb  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/linux-modules-5.5.0-050500-lowlatency_5.5.0-050500.202001262030_amd64.deb  sudo dpkg -i *.deb  Unfortunately I wasn't able to install this kernel version and got some errors with dpkg: dpkg: error processing package linux-image-unsigned-5.5.0-050500-generic (--install):  dependency problems - leaving unconfigured Setting up linux-modules-5.5.0-050500-lowlatency (5.5.0-050500.202001262030) ... Errors were encountered while processing:  linux-image-unsigned-5.5.0-050500-generic  Any help please?  Thanks for you answers, sorry but I am very new to Linux! Shall I download only: wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/linux-headers-5.5.0-050500_5.5.0-050500.202001262030_all.deb  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/linux-headers-5.5.0-050500-generic_5.5.0-050500.202001262030_amd64.deb  wget -c https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/linux-image-unsigned-5.5.0-050500-generic_5.5.0-050500.202001262030_amd64.deb  and then sudo dpkg -i *.deb  ?


Is there any way I can 'undo' the factorial operation? JUst like you can do squares and square roots, can you do factorials and factorial roots (for lack of a better term)?   Here is an example: 5! = 120.  Is there a way I can work out the number that must be factorialed (??) to give the answer 120?


Run AirPort Utility 5.6.1 in High Sierra

I would like to install the Airport version 5.6.1 on MacBook with High Sierra.  It already has the Airport Version 6.3.8 installed.  Can I have both installed and without removing the 6.3.8 and use the 5.6.1 instead.


How many monsters do I have to kill before the Genocide mode activates?

I've killed a whole lotta monsters in the RUINS and I'm on lvl 3 already. I'm just where you pick up the Toy Knife but I still haven't had the 'but nobody came' encounter yet. Also, I've gone back but had no more encounters.  What should I do?


Random numbers with no repeats with memory constraints

I want to pick random numbers without repeats between 0 and a very large number, say, 2^64. I'll do this a lot of times and I don't have much RAM, so I can't just store the numbers that have already been used and compare each new number with that list. I know I could just store this list to a file, but that would be slow.  Is there an algorithm that can generate random numbers without repeats, that doesn't require all of the generated numbers to be stored somewhere? For example, it could be a function that takes a number from 0 to n as the input, and maps each possible input to a unique output from 0 to n. So, to generate, say, 100 random unique numbers, I can just call this function with arguments from 1 to 100. (I realize that such a function would not be "random," since every time it is called with the same input, it would give the same output. But the sequence of outputs would appear as random as any other pseudorandom number generator.)  So really this is three questions.   Is such an algorithm at all possible? What would the pseudocode look like, if it is possible? Is it practical to use in any realistic situation?   Note: There's a boatload of "random numbers no repeats" questions on here, but I didn't find any that had the "without storing already-used numbers" catch, so I don't think this is a duplicate.


As below specs Linux OS can be Install? all driveres will be availabel releted to hardware?

OS Operating system    FreeDOS Processor Processor   Intel® Core™ i5-4210U with Intel HD Graphics 4400 (1.7 GHz, 3 MB cache, 2 cores) MEMORY Memory, standard    4 GB 1600 MHz DDR3L SDRAM (1 x 4 GB) STORAGE Hard drive description  1 TB 5400 rpm SATA OPTICAL DISK DRIVE Optical drive   SuperMulti DVD burner GRAPHICS Graphics    NVIDIA GeForce 820M (2 GB DDR3 dedicated) Display Display size (diagonal)     15.6" Display     15.6" diagonal HD BrightView LED-backlit (1366 x 768) Connectivity Expansion slots     1 multi-format SD media card reader Network interface   Integrated 10/100 BASE-T Ethernet LAN Wireless    802.11b/g/n (1x1) and Bluetooth® 4.0 combo Ports/Slots Ports   1 USB 3.0; 2 USB 2.0; 1 HDMI; 1 RJ-45; 1 headphone/microphone combo INPUT Webcam  HP TrueVision HD Webcam (front-facing) with integrated digital microphone Pointing device     Touchpad with multi-touch gesture support Keyboard    Full-size textured island-style with numeric keypad Audio Audio features  Dual speakers POWER Power supply type   65 W AC power adapter Battery type    4-cell (41 WHr) Li-ion SECURITY Security management     Kensington MicroSaver lock slot; Power-on password; Accepts third-party security lock devices MACHINE DIMENSIONS & WEIGHT Weight  Starting at 2.23 kg Minimum dimensions (W x D x H)  37.8 x 25.9 x 2.53 cm


In Java, should the hashCode of an object ever change?

It seems that many classes (e.g. HashSet) assume that the hashCode of an object will not change. The  is clear about what the relationship between equals and hashCode should be.   But is it poor design to implement a hashCode that changes across an object's life-time?


Submodule of a noetherian module is noetherian

Assume $R$ is a ring, $\psi:M\rightarrow N$ a surjective $R$-modules homomorphism. Then, $M$ is noetherian $\iff$ $N$ and $K=\operatorname{Ker}(\psi)$ are noetherian.  So I proved $\leftarrow$. Now I assume $M$ is noetherian. It's not hard to show $N$ is noetherian since $\psi$ is surjective. Now I tried to prove that $K$ is noetherian - I took $K'\subseteq K$ a submodule of $K$. So, $K'\subseteq M$ and therefore it's a submodule in $M$ and so if finitely generated. Is my reasoning correct or am I missing something (maybe the fact that it's finitely generated in $M$ doesn't mean its finitely generated in $K$?). Any help would be appreciated.


Trying to upgrade to 16.04 from 15.10, but "the required dependency 'apt (>= 1.0.10.2ubuntu2)' is not installed"?

I tried sudo apt-get update, but got   E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable) E: Unable to lock directory /var/lib/apt/lists/ E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?   Any advice? Let me know if you need any more info.


I have watched 2 movies "The way back" & "Just mercy". I noticed that some African American actors say "it don't..." in the movie. I could not find the scripts  of these films.  Didn't the director correct the script?  Or is that a correct expression?  Why do some African American people say "it don't..." in some movies?


Change style properties of several layers simultaneously?

I'm working on bulk data. I have a few hundred GeoTIFF images imported into a QGIS project, and I'd like to modify their layer properties - things like the no-data-value, transparency of certain pixel values, colour map assignments...  But I can't seem to find a way to apply these changes to several layers at once, short of editing the XML file with a global search-and-replace. Is there a way to do this using the GUI?


Prove that two paths on opposing corners of the unit square must cross.

I'm looking for a simple argument to the following:  Given two (continuous) paths on the unit square, one from (0,0) to (1,1) and the other from (1,0) to (0,1), prove that the paths cross at some point $(x_0, y_0)$.  I have constructed a topological argument for why this is true using compactness (and a proof by contradiction), but the person I'm working with seems to think there is a "simple" and "well-known" argument that says the two paths must cross.  I haven't been able to find such a result.  Does anyone know of one?  Thanks!


I just installed Ubuntu 12.04 LTS about 2 weeks ago. A week later a newer LTS came out. Now I know that I will get to upgrade in June but I don't know if I should upgrade or not. Please give me suggestions.


AB testing - normalizing for a group's historic performance? Bayes Factors?

If you split traffic on a website in order to conduct an AB test, optimizing/ monitoring conversion, and you split users by evens/ odds, and have the following information before the test is conducted: group     total_recs    n_success   conversion_rate control    1091653       162424      0.148787 treatment  1098513       153955      0.140149  where the control group has a 6.16% relative improved conversion rate over the treatment group for > 1,000,000 samples (even though this is relatively unlikely, since there's no reason odd id users would convert more than evens etc..) If we then run an AB test for 2 weeks and obtain the following results: group     total_recs   n_success    conversion_rate control    46812        7198         0.153764 treatment  47128        7294         0.154770  where the treatment group shows a relative improvment of 0.65%, intuitively, this suggests that the treatment is an improvement. Assume that the null cannot be rejected, and that for whatever reason, no more data can be collected. Is there some way to adjust for this? I.e. normalize current results based on historic evidence? And if so, how can you do this? Additionally; is this something that actually makes sense to do? Instead, if you were to use a Bayesian approach for model comparison, and incorporate MCMC sampling to generate posterior probabilities, how can the Bayes Factors be calculated from the posterior probabilities? Cheers, Appreciate responses!


Clicked "guest session" , system restarted, and now I'm stuck at a black screen

I accidentally clicked the "guest" user profile and my system restarted itself, and now I can't get past a black screen with only the mouse pointer visible. Can somebody help me please?


Is there a way to automatically use sudo whenever I get "Permission denied"?  I don't want to become superuser, since I still want to be asked for the password in such cases. I just don't want to write sudo in front of everything.


So, I'm an absolute beginner at LTSpice(I just started today). I want to know how to add the model of transistor(say model ZTX300 or BC108) to my schematic. I can't find the model in the standard.bjt file. So is there any way how to use them in LTSpice?


Is it possible to add a combination of tags as a favorite? for example adding the combination of c# and android will highlight question with these 2 tags attached to them.


Why has the human eye evolved to become sensitive only to the visible light?

The human eye has evolved to become sensitive only to visible part of the electromagnetic spectrum. Why? Why is infrared vision disfavoured for us by evolution but not for some other animals? I am not an expert of biology but curious.


Can my 15 year old son travel back alone to home country (India) from the UK?

My son got a child visit visa for the UK; he accompanied me while entering the UK. Now, can he travel back to our home country (India) without being accompanied?


Let $f(z) = z + g(z)$ where $g$ is holomorphic. Suppose that $|\operatorname{Im} g(z)| < 1$ for $z ∈ [−1 − i, 1 − i]∪[−1 + i, 1 + i]$ and $|\operatorname{Re} g(z)| < 1$ for $z ∈ [−1 − i, −1 + i] ∪ [1 − i, 1 + i]$.   Show that $f$ has exactly one zero on the square $Q =$ {$x + iy ∈ \Bbb C : |x| < 1, |y| < 1$}.  My attempt:  I let $h(z) = z$. Then, I want to compare $|g(z)|$ and $|h(z)|$ because if $|g(z)| < |h(z)|$ then by Rouché's theorem, $h$ and $h+g$ have the same number of zeros, and $h$ has in fact one zero. But then $h+g = f$ and thus $f$ would also have the same number of zeros as $h+g$ which has one zero.  This is what I could come up with: $|g(z)| = |u(z) + iv(z)|$. Then for $z \in Q$, we have $|g(z)| \leq |u(z)| + |v(z)| < 1 + 1 = 2$ (since $|\operatorname{Im} g(z)| < 1$ for $z ∈ [−1 − i, 1 − i]∪[−1 + i, 1 + i]$ and $|\operatorname{Re} g(z)| < 1$ for $z ∈ [−1 − i, −1 + i] ∪ [1 − i, 1 + i]$)  But I don't know how to continue from here. Any help please?


PC not working correctly after downloading missing dll's . Need to delete them

A few days ago I updated my windows 7 ultimate (32 bits). After the updates I faced I couple of errors. All those errors were of programs like sidebar.exe, internet explorer, java, a lot of uninstalling programs, etc....  in the format in the picture below     All the missing dll files (7-10 files I think) have the name api-ms-win-downlevel-xxxxxxx-l1-1-0.dll where the "xxxxxxxx" is either ole32, user32, version,etc.... . Before doing anything I tried 'sfc /scannow' command in cmd, but there was no errors to fix.   So I tried looking for a solution and somehow ended downloading dll files from the internet (which screwed my pc). I tried doing stuff like 'regsvr32 /u api-ms-win-downlevel-xxxxx-l1-1-0.dll', deleting them manually, stopping their running processes, even trying to delete them with cmd  (which gave me "access denied") but all in vain  All I want now is to :-    Delete those dlls  Get those missing dlls without messing up my pc   It might be my HDD though,  I am currently checking whether it is or not


Difference between $\mathbb{R}$-linear and $\mathbb{C}$-linear maps

Suppose we have a $f\colon \mathbb{C} \to \mathbb{C} $. I am confused when people say $f$ is $\mathbb{R}$-linear map or $\mathbb{C}$-linear map. What is the difference between these two ?


From a traveler's point of view, what prevents him from reaching speed faster than light?

From a traveler's point of view, as he is accelerating with $1g$, in under one year he would reach the speed of light. Note that from his point of view, everything looks normal so he could keep accelerating, except of course other than all distances become zero and time looks frozen, and probably eventually points ahead of him would become his behind, and time started moving backward. So, what prevents him from reaching speed faster than light?


QGIS- Can't find fitting CRS (rotated regular grid)

I am using QGIS 2.18.15. I got raster layer data’s for wind speeds in Europe.  () The data description describes the projection as an:      "rotated regular grid, virtual North Pole at 39.25 N, 162.00 W (rotated coordinates)"   I can add the raster to QGIS but I do not find the fitting CRS. I looked for a possible Coordinate Reference System online but could not find one. Do you have an idea which CRS might suit in this case?


Auto-upvote comment during Low Quality review when selecting same reason

While working with the Low Quality review queue, when selecting a reason why you believe a post should be deleted, you automatically comment on the post with a canned piece of text explaining why you voted one way or another (if it doesn't already exist from another reviewer).  When you select the same reason as another reviewer and the comment already exists, what would we think about having it auto-upvote that comment instead of just doing nothing?    In the example above, another user had chosen to flag the answer for deletion for the same reason I picked, so I would expect my action to upvote their comment.


I'm putting together a video from the VSE. In the sequencer window it is rendering and scrubbing at near realtime yet during output it is taking around 3x longer.   The frames are taking 0.13 seconds each whilst the CPU is only utilised around 20%. I am rendering onto an SSD and using H.264 format 1280x720. Tile size options etc appear to have no or very little effect.  In short - is there any method to speed up the rendering of frames from the VSE?


What's the main difference between Intel processor generations?

What are the main differences between each processor generation of Intel processors/chipsets? Is there a performance difference?  I've already seen processors from first to sixth generation, however I don't know/understand the exact differences.


How is it decided when a child is born with the Force?

Is the Force just a natural thing in that galaxy that is passed down genetically, or do the 'ones' choose who has the Force? Luke inherits his Force ability from Anakin, but what is the case when a Force sensitive child is born into a non-Force sensitive family? Also, how does that Jedi holocron in The Clone Wars tell the Jedi where the Force sensitive children are?  Canon answers are what I'm looking for, but I am open to any Legends explanations.


Is a short description of a question OK if self-answering?

Since , I am planning to document a few things I unnecessarily retype from time to time (answering other questions). These are general (though focused) questions and I would like to write a longer answer to have everything in one place. Let's say that the question is "what is the optimal length of a password?", posted on Information Security SE. In the body of the question, I would have just mentioned the context:  that the question is about passwords in specific operating systems and web applications, threat model etc. I believe that the whole part of "what research have you done / what have you tried  so far", is neither needed, nor useful (as I do not want to show that I did some efforts, that will come in the answer). Is it OK per the rules to keep a trimmed-down body of such self-answered-to-be question? EDIT: I edited this question to mention the actual question I would be asking, instead of a general one ("what is the best height of a chair"). Apologies if this is not understandable because too technical -- I took into account the comments about "too broad" expressed in the answers.


Conditional Expectation of a normal distribution

say we have a multivariate normal distribution with ${\boldsymbol Y} \sim \mathcal{N}(\boldsymbol\mu, \Sigma)$ The conditional expection is $\overline{\boldsymbol\mu}=\boldsymbol\mu_1+\Sigma_{12}{\Sigma_{22}}^{-1}({\boldsymbol a}-\boldsymbol\mu_2)$ Is this saying that for each value of $a$ in a dataset you minus the mean and multiply by the covariance matrices to obtain the conditional expectation or is it a double summation of $ a - \boldsymbol\mu_2$? I am slightly confused as to what the terms actually are and how to calculate them.


Data received when earpiece connected to audio jack?

I'm still new to electronics and signals.   I'm currently doing a project, and i have to detect the type of earpiece connected to an audio jack. So far, i found out that when you plug in your earphone/headphone, your mobile device detects that a earphone is connected, meaning, there is some sort of data being transferred when connected. Is it possible to detect the type of earpiece(or any sort of info) through the audio jack.   Thanking in advance.


Too Minor rejection reason needs either to be reworded or removed

At the moment the reviewers are split into two camps, one is accepting minor edits, the others don't. But first, let's start with some basics:     too minor      This edit is too minor; suggested edits should be substantive improvements addressing multiple issues in the post.   And now we'll look at . In my opinion this is way too minor to be approved, but the . Though, .  From an editors point of view, it's a little bit confusing, because some people are accepting those edits, some don't...so it's pure luck based on who sees it first if it is accepted or not. In theory an editor could even do the same edit multiple times until it is accepted.  That's a very big hole of inconsistency there, which should be plugged. Either the rejection reason should be refined and clearer outlined what is "too minor" or, if those edits are valid, it should be removed altogether (because in that case minor edits are already caught by the system).


Random forest regression not predicting higher than training data

I've noticed that when building random forest regression models, at least in R, the predicted value never exceeds the maximum value of the target variable seen in the training data. As an example, see the code below. I'm building a regression model to predict mpg based on the mtcars data. I build OLS and random forest models, and use them to predict mpg for a hypothetical car that should have very good fuel economy. The OLS predicts a high mpg, as expected, but random forest does not. I've noticed this in more complex models too. Why is this?   > library(datasets) > library(randomForest) >  > data(mtcars) > max(mtcars$mpg) [1] 33.9 >  > set.seed(2) > fit1 <- lm(mpg~., data=mtcars) #OLS fit > fit2 <- randomForest(mpg~., data=mtcars) #random forest fit >  > #Hypothetical car that should have very high mpg > hypCar <- data.frame(cyl=4, disp=50, hp=40, drat=5.5, wt=1, qsec=24, vs=1, am=1, gear=4, carb=1) >  > predict(fit1, hypCar) #OLS predicts higher mpg than max(mtcars$mpg)       1  37.2441  > predict(fit2, hypCar) #RF does not predict higher mpg than max(mtcars$mpg)        1  30.78899


Try and hit me! Try to hit me!  Do the above example mean exactly the same and it's just a matter of preference to use which word?  He tried to make it better. He tried and made it better.  The second example sounds strange when it comes to more formal sentence of that sort. Is it still a correct use of the phase?


Hi, I have a problem with Eevee, when i render an image the first few second it fine but when it finishes to render everything it goes white and i can't see anything in render layer. This is what i get every time i render and there is no other object that is hidden in the viewport or anything like that


python regex need help to enumerate data

I want to enumerate '4.9.8' from this line. how can i get that. i am new in Regex.  import re url  = 'http://variety.com' line = "<script type=\'text/javascript\' src=\'https://js-sec.indexww.com/htv/htv-jwplayer.min.js?ver=4.9.8\'></script>" regex = "?ver=(.+?)\'>" version = re.findall(regex,line) print(version)


Example:     Actually, there's someone who can help you."      Actually, there's someone who can help you out."   What's the difference between the two? Or they mean the same thing?


Let $U$ and $W$ be subspaces of $V$. Show that $U\cup W$ is a subspace of $V$ if  and only if $U \subset W$ or $W \subset U$.   I am not sure what I can do with the assumption that $U\subset W$ or $W \subset U$ to get started. If I could get a hint pointing me in the right direction, that would be appreciated, thanks


Assume that $ f: R \to R $ is uniformly continuous. prove that there are constants A,B such that $ |f(x)| \le A + B|x| $ for all $ x \in R $.

Assume that $ f: \mathbb R \to \mathbb R $ is uniformly continuous. prove that there are constants $A,B$ such that $ |f(x)| \le A + B|x| $ for all $ x \in \mathbb R $.  my concern is just $f$ is uniformly continuous on $\mathbb R$ how this is going to help us to find such $A$ and $B$.


When is a cellular automaton "bidirectional"?

From .   "A (bi-directional, deterministic) cellular automaton is a triplet $A = (S;N;\delta)$, where $S$ is an non-empty state set, $N$ is the neighborhood system, and $\delta$ is the local transition function (rule). This function deﬁnes the rule of calculating the cell’s state at $t +1$ time step, given the states of the neighborhood cells at previous time step $t$"  I haven't found other "bidirectional" CA via Google, so I wonder what does the term say about this automaton's properties. Does it mean that the state $t+1$ can be used to find out the state $t$?


How can I make a 3D object that looks transparent on the outside and mapped on the inside?

Id been trying to make the same structure that this artist did for his model I don't know how to even call it, well heres the example from deu3884 on sketchfav whom I'm not trying to copy but instead understand in what way he did this and how can it be done on Blender.      I just want to know how to do the clouds and all the surroundings and if its possible to make it on cycles render. Thank you for the attention.


If $f$ is an increasing function over the reals, given a number $M$, is it always possible to find some $x \ge M$ such that $f$ is continuous at $x$? This seems like it should be intuitively true but I can't find a proof.


How to suppress BOM effect in the output?

When I used listings package to import C# code snippet from within my LaTeX file, I got an output as follows.    At the first line, there is an unnecessary white space because of the BOM (Byte Order Mark) that is intentionally added by Microsoft (R) Visual Studio.  I really want to remove it from the output rather than from the C# file, how to do that?   Here is my LaTeX code:  \documentclass{article} \usepackage{listings,xcolor} \lstset{% language={[Sharp]C}, backgroundcolor=\color{yellow!20}, basicstyle=\tiny, keywordstyle=\color{blue}, identifierstyle=\color{magenta}, breaklines=true}   \begin{document} \lstinputlisting{Program.cs} \end{document}


i have the following list of dictionaries:  my_list = [      {        "field1": value,        "field2": value,        "time": 2017-12-01 14:34:12,        "field3": value     },     {        "field1": value,        "field2": value,        "time": 2017-12-01 14:31:20,        "field3": value     },     {        "field1": value,        "field2": value,        "time": 2017-12-01 14:40:02,        "field3": value     } ]   How can i sort this list by the time value of the dictionaries? (so the dictionary with the highest time value will be in the first index of the list and so on..)  Thanks!


SSH access to office host behind NAT router

I would like to access the ssh port of my office linux host from home. Unfortunately the host is located behind a NAT router. So, the IP address is not publicly available. There is however access to another internet host (Server) which is unfortunately only non-root access. After a while of searching I do not find a suitable solution.  Following setup:   Office PC (linux, root access) behind NAT (IP not public) but full Internet access. Server PC (linux, no root access) static and public IP and full Internet access. Home PC (linux, root access) behind NAT (IP not public) but full Internet access.   Possible connections: Office PC --> Server <-- Home PC  Not possible: Office PC <-X- Server -X-> Home PC  Neither the Home PC, nor the Server can initiate access to the Office PC. But both the Office PC and the Home PC can initiate connections to the Server.  Reverse SSH tunnel not possible: I tried a method called reverse ssh-tunnel. Unfortunately this requires GatewayPorts on Server set to "yes" in /etc/ssh/sshd_config, where I have no root access.  In principle it should be possible:   0) On the Server I start a userspace program which listens on 2 ports (1 incoming, 1 outgoing)  1) On my office PC I run a another program which keeps a TCP connection open to the outgoing port on the server.  2) From home I connect to Server's incoming port.  There should be a standard solution for this out there.  What is the quickest and cleanest solution to solve this?  Frank


error in updateting ubuntu 20.04.1 {sudo apt update}

choudhary@jiten:~$ sudo apt update [sudo] password for choudhary:  Get:1 http:/ /in.archive.ubuntu.com/ubuntu focal InRelease [265 kB] Ign:2 http:/ /ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu focal InRelease Hit:3 http:/ /dl.google.com/linux/chrome/deb stable InRelease                    Hit:4 http: //security.ubuntu.com/ubuntu focal-security InRelease                Ign:5 http: //ppa.launchpad.net/gencfsm/ppa/ubuntu focal InRelease               Hit:6 http:/ /in.archive.ubuntu.com/ubuntu focal-updates InRelease Hit:7 http:/ /in.archive.ubuntu.com/ubuntu focal-backports InRelease Err:8 http: //ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu focal Release   404  Not Found [IP: 91.189.95.83 80] Err:9 http://ppa.launchpad.net/gencfsm/ppa/ubuntu focal Release   404  Not Found [IP: 91.189.95.83 80] Reading package lists... Done                       E: The repository 'http: //ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'http: //ppa.launchpad.net/gencfsm/ppa/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.


Maximal normal $\pi$-subgroups and torsion subgroups

Let be $\mathbb{R}$ the real numbers and $\mathbb{Z}$ the integers. Let $G = \mathbb{R}/\mathbb{Z}$. Determine   $O_\pi(G)$ - the normal maximal $\pi$-group of $G$, $T(G)$ - torsion subgroup.


Most articles and books are written in the conventional fonts like Computer Modern Roman, Times New Roman, etc. which are similar to each others. Why aren't more fonts used?   I wrote my course this year in a cursive font and it didn't cause any problem to any students. I'm afraid however that if I do the same in an article, the article will be ignored. Would you take an article written in such a font seriously? Would you even read it?  A sample of unconventional fonts:


I have two shapes, one called bike_stations and another one called quite_streets, both contains geographic information about elements in Madrid, Spain and each one come from two different sources. The coordinates in quite_streets are like this: 431376.8435674606589600,4464668.6104000005871058 and the coordinates in bike_stations are like this: -3.7246532000000001,40.3914722000000026 So, if I put them together in QGIS with OSM base map I have the folloging result:  Bike_stations appears in the Guinea Gulf and quite_streets at the north of Algeria, when they should be located at the X. Does anyone know any method in QGIS, PostGIS or maybe Java to transform the coordinates in order to be equal to the coordinates of the other shape?


Are cardinal numbers well defined? Or could we have something like $\aleph_{1/2}$?

From what I understood, cardinal numbers are defined as:  $\aleph_0$ = the cardinality of $\mathbb{N}$ $\aleph_{n+1}$ = is the least cardinal number greater than $\aleph_n$  The continuum hypothesis states that the cardinality of $\mathbb{R}$ is  $\aleph_1$. I more or less understand this cannot be proven (does not follow from ZFC).  However, can it be proven dat there in fact is a 'least cardinal number' greater than $\aleph_0$?  Is it possible that there are sets with cardinality $\aleph_{1/2}$, $\aleph_{1/3}$, et cetera, so to speak?  Or expressed differently: is it possible that for every set A with cardinality CA > $\aleph_0$, there exists another set B with cardinality CB where CA > CB > $\aleph_0$?


Why doesn't my nearby list show any Pokémons?

When I play Pokemon Go my nearby list is just white and do not show any Pokémons at all, why?


I want to make sure that path always ends with \ and I try to use Path.Combine as the code below.  I expect System.IO.Path.Combine("xxx", System.IO.Path.DirectorySeparatorChar.ToString()) to return xxx\ but it returns only \  The same goes for System.IO.Path.Combine("xxx", "\\", "zz") which I expect xxx\zz but it turns out to be \zz  Here are tests I have done.   I am not sure if this is a desired behavior or it's a bug.


I want to add the same footnote in multiple places in a table. Can anyone please help me to do that.     \befin{minipage}[b]{0.9\linewidth}  \begin{tabular}{l l l }  \hline  a & b & c \footnote{this is the ref} \\  d & f & e \footnote{I want the same foot note here}\\  j & l & m \\ \end{tabular}  \end{minipage}


Ruby API - JSON Parsing - Writing to file

I  get the REST response data from a URL. I then write it to a JSON file, however, it's put it on one line in a long string, and I need to have it in readable format in the JSON file.  My code is:  require 'rubygems' require 'json' require 'rest-client'  class Rest    def self.getData      response = RestClient.get 'http://jsonplaceholder.typicode.com/posts'     response = JSON.parse(response)      File.open('/Users/robertreed/RubymineProjects/draft/posts.json', 'w') do |f|       f.write(response.to_json)     end        puts response      end    getData  end   It's printing to the console and writing to the JSON file on one line:  [{"userId"=>10, "id"=>100, "title"=>"at nam consequatur ea labore ea harum", "body"=>"cupiditate quo est a modi nesciunt}]   Any suggestions on how I could achieve this?


Before you mark it as duplicate, please note that I had a look at the thread about null pointer exception we have on stackoverflow. Unfortunately, I have not managed to solve the problem and I would be grateful if someone could point me in right direction, since I am stuck for quite a while now.  I am getting an error      java.lang.NullPointerException at   sample.LoginWindow.setBtnLogin(LoginWindow.java:39)) point at the   following line preparedStatement.setString(1, txtUserName.getText()   I have class DBUtilities which holds my database connection and some closing methods:   public class DBUtilities {     // Getting connection to the database.     public static Connection getConnection() throws SQLException {         String url = "jdbc:mysql://localhost:3306/studentmanagementdb";         String user = "admin";         String pass = "administrator";         Connection connection = DriverManager.getConnection(url, user, pass);         return connection;     }     // Close prepared statement.     public static void closePreparedStatement(PreparedStatement pStmt) {         try {             if(pStmt != null) {                 pStmt.close();             }         }catch(SQLException sExepction) {             showErrorMsg("SQL Database Error:", "Prepared Statement could not be closed.");         }     }     // Close result set.     public static void closeResultSet(ResultSet resSet) {         try {             if (resSet != null){                 resSet.close();             }         }catch (SQLException sException) {             showErrorMsg("SQL Database Error:", "Result Set could not be closed.");         }     }     public static void closeConnection(Connection connect) {         try {             if(connect != null) {                 connect.close();             }         }catch (SQLException sException) {             showErrorMsg("SQL Database Error:", "Database Connection could not be close.");         }     }     // Shows error message.     public static void showErrorMsg(String title, String msg) {         Platform.runLater(() -> {             Alert alert = new Alert(Alert.AlertType.ERROR);             alert.setTitle(title);             alert.setHeaderText(msg);             alert.setWidth(200);             alert.setHeight(200);             alert.showAndWait();         });     } }   Class which uses the connection:  public class LoginWindow implements Initializable{      @FXML     private TextField txtUserName;     @FXML     private PasswordField txtPassword;     @FXML     private Button btnLogin;      Connection connection = null;     PreparedStatement preparedStatement = null;     ResultSet resultSet = null;     DBUtilities dbUtil =  new DBUtilities();        // Setting the login button.     @FXML     private void setBtnLogin(ActionEvent event) {          try {             connection = dbUtil.getConnection();             String sqlQuery = "SELECT * FROM 'User_Login_Details' WHERE 'User_Name' = ? AND 'User_Password' = ?";             connection.prepareStatement(sqlQuery);             preparedStatement.setString(1, txtUserName.getText());             preparedStatement.setString(2, txtPassword.getText());             resultSet = preparedStatement.executeQuery();          }catch (Exception exception) {             //dbUtilities.showErrorMsg("Database Connection Error:", "Could not connect to the database.");             exception.printStackTrace();         }finally {             dbUtil.closePreparedStatement(preparedStatement);             dbUtil.closeResultSet(resultSet);             dbUtil.closeConnection(connection);         }     }     @Override     public void initialize(URL location, ResourceBundle resources) {         btnLogin.setOnAction(this::setBtnLogin);     } }


Area of the intersection of four circles of equal radius

This picture basically shows a rearrangement of four quarters of a circle of radius 1. It asks for the shaded area.  I got the answer to be $\frac{2\pi + 6}{13}$. But then it is incorrect.   The way I did it is by rearranging the four pieces into respectively a circle a square and a larger square with a inscribed circle. And naming each different pieces in the picture as x y and z.


Convenient print to stderr in spock/groovy

In a spock (groovy) test, I can print to stdout by simply  println 'hello world'   If I want to print to stderr, I can:  System.err.println 'hello world'   or even shorter:  import static java.lang.System.err  err.println 'hello world'   but does groovy have built-in support for a more convenient/terse syntax, eg something like  eprintln 'hello world'     Note: This is not a duplicate of , which asks how to print to stderr. This question states how you can print to stderr (in a neater way than the linked question IMHO) but instead asks if there's a built in way to print to stderr - ie:  Is there a method similar to  that prints to stderr?


There was a reason why I constantly failed physics at school and university, and that reason was, apart from the fact I was immensely lazy, that I mentally refused to "believe" more advanced stuff until I understand the fundamentals (which I, eventually, never did). As such, one of the most fundamental things in physics that I still don't understand (a year after dropping out from the university) is the concept of . No one cared to explain what a field actually is, they just used to throw in a bunch of formulas and everyone was content. The school textbook definition for a field (electromagnetic in this particular case, but they were similar), as I remember it, goes like:  An electromagnetic field is a special kind of substance by which charged moving particles or physical bodies with a magnetic moment interact.  A special kind of substance, are they for real? This sounds like the authors themselves didn't quite understand what a field is so they decided to throw in a bunch of buzzwords to make it sounds right. I'm fine with the second half but a special kind of substance really bugs me, so I'd like to focus on that. Is a field material? Apparently, it isn't. It doesn't consist of particles like my laptop or even the light. If it isn't material, is it real or is it just a concept that helps to explain our observations? While this is prone to speculations, I think we can agree that in scope of this discussion particles actually do exist and laws of physics don't (the latter are nothing but human ideas so I suspect Universe doesn't "know" a thing about them, at least if we're talking raw matter and don't take it on metalevel where human knowledge, being a part of the Universe, makes the Universe contain laws of physics). Any laws are only a product of human thinking while the stars are likely to exist without us homo sapiens messing around. Or am I wrong here too? I hope you already see why I hate physics. Is a field not material but still real? Can something "not touchable" by definition be considered part of our Universe by physicists? I used to imagine that a "snapshot" of our Universe in time would contain information about each particle and its position, and this would've been enough to "de" it but I guess my programmer metaphors are largely off the track. (Oh, and I know that the uncertainty principle makes such (de)serialization impossible — I only mean that I thought the Universe can be "defined" as the set of all material objects in it). Is such assumption false? At this point, if fields indeed are not material but are part of the Universe, I don't really see how they are different from  except for perhaps a more geeky flavor. When I talked about this with the teacher who helped me to prepare for the exams (which I did pass, by the way, it was before I dropped out), she said to me that, if I wanted hardcore definitions,  a field is a function that returns a value for a point in space.  Now this finally makes a hell lot of sense to me but I still don't understand how mathematical functions can be a part of the Universe and shape the reality.


Docker Errors For Ubuntu on Sudo Apt-get update

A while back I installed Docker, but don't remember what I did.     I'm still learning/getting used to Linux and am unsure how to get rid of the following error.   When I run sudo /apt-get update I get the following error. How can get rid of this error?  I'd like just to eliminate this error, not reinstall Docker, do /I need to revert the add-apt-repository action that I did when installing?  Err:14 https://download.docker.com/linux/ubuntu eoan Release                      404  Not Found [IP: 2600:9000:21d5:ae00:3:db06:4200:93a1 443] Get:15 http://us.archive.ubuntu.com/ubuntu eoan-updates InRelease [97.5 kB]    Err:16 https://download.docker.com/linux/debian eoan Release                      404  Not Found [IP: 2600:9000:21d5:ae00:3:db06:4200:93a1 443] Get:17 http://us.archive.ubuntu.com/ubuntu eoan-backports InRelease [88.8 kB] Hit:19 https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease  Reading package lists... Done                                                   E: The repository 'https://download.docker.com/linux/ubuntu eoan Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. E: The repository 'https://download.docker.com/linux/debian eoan Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.


Is the sequence of sums of inverse of natural numbers bounded?

I'm reading through Spivak Ch.22 (Infinite Sequences) right now. He mentioned in the written portion that it's often not a trivial matter to determine the boundedness of sequences. With that in mind, he gave us a sequence to chew on before we learn more about boundedness. That sequence is:  $$1, 1+\frac{1}{2}, 1+\frac{1}{2}+\frac{1}{3}, 1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}, . . .$$  I know that a sequence is bounded above if there is a number $M$ such that $a_n\leq M$ for all $n$. Any hints here?


What is the name for someone who obsessively exercises slight power?

"Give a man a hammer, and everything he sees will be a nail," is an astute observation of human behavior. What is the name for someone with slight power, for example, the power to vote to close a question on this site, who exercises that power obsessively and gleefully?


Please see the code below:  package RMITest;      import java.rmi.Naming;      import java.rmi.RemoteException;      import java.rmi.server.UnicastRemoteObject;      public class HelloImpl extends UnicastRemoteObject implements Hello      {       public HelloImpl() throws RemoteException {}       public String sayHello() { return "Hello world!"; }       public static void main(String args[])      {          try          {              System.setProperty("java.rmi.server.hostname","172.16.4.142");             HelloImpl obj = new HelloImpl();              // Bind this object instance to the name "HelloServer"              Naming.rebind("HelloServer", obj);          }         catch (Exception e)          {              System.out.println("HelloImpl err: " + e.getMessage());              e.printStackTrace();          }      }  }    I am trying to follow this tutorial: .  The error I am getting is: ClassNotFoundException RMITest.Hello.  Hello is the interface.  Does the classpath need to point to the .class files or the .jar.  There do not appear to be any .jar files generated by Netbeans.  I am a .NET Developer so I am quite new to this.


In what situations would it be appropriate to include one's photograph in a CV?

I think I have only seen one CV where a photograph of the CV owner was included. I personally wouldn't want to put my photograph in my CV, but I was wondering, in what situations would including a photo if oneself within the CV be appropriate?


. (I seem to recall seeing an instance where it captured something that wasn't a definition, too.) And the definitions it does capture can be in any language, but it doesn't mention what language they're in.  Here's the relevant part of the layout of an  entry:  The language name appears in an HTML H2 element (in ==...== code in the wiki markup, on a line by itself). The page is divided by such elements (i.e., all Latin-language definitions appear under the ==Latin== code). There are no other == headers on the page, though there are some H2s (generated by the software, so they don't appear in the wiki markup). The definitions are lines that start with \#+[^*:] (in regex), i.e. any number of #s followed by anything but a * or :. That's in the wiki markup; in HTML it translates to: an LI element in an OL, but not any UL or DL contained within that LI.  ?action=raw on a Wiktionary URL will give you the wiki markup instead of the HTML.


Can't resize windows with dragging their top

Recently this problem occured. I don't know why, but now I can't just drag windows to top, left or right part of the screen to resize the, quickly. I kind of got used to this, so now it is just frustration that nothing happens when I try to do that.   It is not a tablet mode as many people in internet suffer from, and I couldn't find any clue to deal with this..


Find integer solutions of $xy=-1$ (using only elementary ring theory).

I know the answer is obvious: In $\mathbb{Z}$ the only solutions of $xy=-1$ are $x=-y=1$ and $x=-y=-1$. My problem is that I want to formally prove it and I don't know how to write it. Where do you even begin for such a trivial statement?  Edit: I would like to prove it viewing $\mathbb{Z}$ as a ring. This is, just using the sum and product of integers. No order, no absolute value, etc...


Photoshop - Show same layer twice and edit both at the same time

My title is very poorly phrased but I'm having a tricky time describing this.  Basically I am trying to create a repeating background right now. I would like to edit a certain area, but for Photoshop to show that same area next to the one I'm editing so I can see if there are seams.  I know some programs allow this (or allow it radially so you can create snowflake and kaleidoscope effects).  Is Photoshop able to do this?  Here is an image to try and illustrate better what I'm talking about:


I need to tell if a function is Frechet differentiable

So I have the function $$f(x,y) =\begin{cases} xy\frac{x^2-y^2}{x^2+y^2} & (x,y) \neq (0,0),\\  0 & (x,y)=(0,0).  \end{cases}$$ I need to tell if the function is Frechet differentiable and why.   I tried to find out something on the internet but I couldn't manage to solve it.   Can you please help me with this?


Top Dimensional Forms on Symplectic Manifolds

I have just started studying symplectic geometry, and one fact has me completely stumped.  Apparently a symplectic manifold $V$ such that $\mathrm{dim}V = n$ has volume form: $\frac{\omega^n}{n!}$.  Now I recall a volume form is a non-vanishing, top-dimensional form on $V$.  However I have no clue how to show $\frac{\omega^n}{n!}$ is either non-vanishing or a top-dimensional form. This last condition in particular seems like something that will have an 'obvious' explanation, but one that I can't figure out.  Most of these definitions have been floating around in my head barely a day. I'm not far into the topic, and my differential geometry/experience with differential forms is still fairly basic, so the simpler an explanation someone can offer, the better.


To start off I am very new to Ubuntu so when explaining do not use shortcuts please because I will not understand. So I installed Ubuntu 15.10 on my Hp Envy and the wireless card is not working. I have been hassling with it all day and I'm finally giving in to making a forum post. The Card is a Intel 7265 Wireless AC(revision61). I am currently attempting to install a newer firmware for it that I downloaded from intels website but I can not for the life of me figure out how to get the file into the firmware folder. So basically I'm making a plea to help me get the firmware installed and if that doesn't work provide more insight before I say goodbye to Ubuntu. Thanks in advance!  lspci -knn | grep Net -A2 02:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 61)     Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5010]     Kernel driver in use: iwlwifi  Rfkill List 0: acer-wireless: Wireless LAN     Soft blocked: yes     Hard blocked: no 1: hci0: Bluetooth     Soft blocked: yes     Hard blocked: no 2: phy0: Wireless LAN     Soft blocked: no     Hard blocked: no  dmesg | grep iwlwifi  [    2.089673] iwlwifi 0000:02:00.0: Unsupported splx structure [    2.092497] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-7265D-15.ucode failed with error -2 [    2.093049] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-7265D-14.ucode failed with error -2 [    2.113852] iwlwifi 0000:02:00.0: loaded firmware version 25.30.13.0 op_mode iwlmvm [    2.148273] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 7265, REV=0x210 [    2.149810] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled [    2.150242] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled [    2.240713] iwlwifi 0000:02:00.0 wlp2s0: renamed from wlan0 [   14.008741] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled [   14.009388] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled [   14.070823] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled [   14.071356] iwlwifi 0000:02:00.0: L1 Enabled - LTR Enabled   After sudo modprobe -r acer_wmi  rfkill list 1: hci0: Bluetooth     Soft blocked: no     Hard blocked: no 2: phy0: Wireless LAN     Soft blocked: no     Hard blocked: no


holomorphic function on punctured disk satisfying $\left|f\left(\frac{1}{n}\right)\right|\leq\frac{1}{n!}$ has an essential singularity at $0$

Let $f$ be holomorphic non-constant on $D=\left\{ 0<\left|z\right|<10\right\}$ . Given that for all $n\in\mathbb{N}$: $\left|f\left(\frac{1}{n}\right)\right|\leq\frac{1}{n!}$ prove that $f$ has an essential singularity at $0$. Find an example of $f$ satisfying the condition.   My idea was to assume for contradiction the singularity is not essential, which means that either the limit $z\to0$ of $f$ exists or of $1/f$, and from $\left|f\left(\frac{1}{n}\right)\right|\leq\frac{1}{n!}$ we get that the limit of $f$ exists and is $0$.  I then define $h(z)=f(z)$ for $z\neq0$ and $h(0)=0$, which is holomorphic on the entire disk, and derive a contradiction from there and the uniqueness theorem. But then the suitable holomorphic function is the Gamma function, which we have not really discussed in class and I'm not sure about it's properties.  Any ways of solving this which avoids using the gamma function?


How to typeset a book where the odd pages are left blank?

My request is as follows:  I have 93 pages of my book. I want to have my text on even pages and blank pages on odd ones. I want to have something like this:  page 1: my text page 2: blank page 3: my text page 4: blank page 5: my text page 6: blank page 7: my text page 8: blank [...] page n: my text page n+1: blank   My intended structure is like a one-sided book, where one reads the right side only.  Probably some command exists to leave odd pages empty, but I didn't find anything to do it automatically.


I have three strings:  $str1 = "abc"; $str2 = "def"; $str3 = "ghi";  I can get the value of all of them like this:  echo "$str1$str2$str3";  But I heard there is a way to join them together, so I can echo all of them without quotes.


For a multi-class classification problem, how to transform the target variable to a form that is usable by sklearn algorithms?

I recently tried to create a model for predicting what class a sample belongs to out of 160 possible classes. These classes of the target variable are just simple strings describing workouts like "Push-ups", "Sit-ups" etc. I used sklearn's method LabelEncoder to transform the target variable, and it assigned every class a number between 0 and 159. I know that the reason why we are supposed to do one-hot encoding for categorical features is to avoid telling an algorithm something nonsensical like "blue is greater than red". My question then becomes, doesn't LabelEncoder tell the sklearn algorithm that "push-ups" is less than or greater than "sit-ups" if both of them are assigned distinct numbers between 0-159? Why or why not? This feels like a very stupid question, but I had real trouble finding an answer anywhere online.


I'm trying to figure out which champion belongs in which lane just as a general rule of thumb. A friend told me that I needed to "learn the meta" after a bit of searching I found this:     The meta currently is a mage mid, bruiser top, jungler in the jungle,   and ranged carry and support bot.         Mage/Caster - Mid   Bruiser - Top   Jungler   Ranged Ad - Bot   Support - Bot        How accurate is that excerpt? I know that situations may vary, but I'm just trying to find a general rule to follow when playing normally.


How do I edit the symbol (a \star in the \box) by LaTeX?

In LaTeX there exists a symbol $\boxplus$ but how do I type the symbol "a star in a box"?


How to access my Android's files using Wi-Fi in Ubuntu?

Both my Ubuntu and Android phone are using the same Wi-Fi. How can I transfer files between the phone and the PC? Is there any way to mount the Android file system? I don't want to use the USB cable. Bluetooth doesn't work. So WiFi is the only other option.   The Android version is Jelly Bean and Ubuntu is 12.04 LTS.


We have $A=\left\lbrace 2019,1010,\ldots,(n+2018)/n,\ldots \right\rbrace$ and $B=A \cup \left\lbrace 1 \right\rbrace$  How can I show directly (that is, not using the compactness criterion in $\mathbb{R}$) that every open cover $G$ of $B$ admits a finite subcover?  moreover, I know that $A$ is not compact and I am aware that I would need a single example to prove it, any hint on how to find an open cover of $A$ that does not contain a finite subcover?  My first thought was to choose the set of all neighborhoods with radius r centered around each point of A but apparently this is wrong and I do not understand why.


This is a very common proof, but there is one point, which many just seem to take for granted.  At one point I'll use the mean value theorem to say  $$ w.l.o.g.\quad  x > y \quad x,y \in (a,b) $$   And from the mean value theorem I get a term like this  $$\frac{f(x)-f(y)}{x-y} = f'(\xi) \leq L $$  But people often conclude $$|f(x)-f(y)| \leq L|x-y|$$  Is that step always true? i.e. is it always true that   $$ x = y \rightarrow |x|=|y| $$