I use Firefox with the "Disconnect" add-on which has the feature to block e.g. content from Facebook etc.   Some of the SE users' icons are from Facebook so if we block that, these icons do not load and are invisible, which is acceptable though.  However, during Winter Bash, there are hats added to the icons. Unfortunately, if the original icon is blocked from loading, the hat just gets placed in the top left corner of the visible screen:    This is a bug, although it's only a minor one because it probably doesn't affect too many users. I would like to suggest to hide the hat if the icon did not load (yet or at all) instead of placing it in the top left corner.  Related issue (from chat, not main sites):
When I loaded the review page (in Stack Overflow, though I have no specific reason to think it is related) I got a weird hat in the upper left hand corner.    See the hat in the upper left hand corner?  That's belonging to user # .  His profile page also has the hat in a ... weird ... location, but not this weird.    I'm guessing this is due to the not-loaded image for the avatar (adblock blocks Facebook avatars for me often)?  It also causes the toolbar notification to show his link unless I'm hovering over something else.  It also changes the location of the gray box to the upper left hand corner when I hover over the hat (and hovering over the white box does nothing).  It's definitely him (or any not-loaded avatar perhaps), once he fell off the last 6 reviewers it stopped appearing.
Prove that any complex matrix can be expressed in term of Hermitian and anti-Hermitian matrices How can we prove that any complex matrix can be expressed in term of hermitian and anti-hermitian matrices of the following form $A = H_1 + iH_2$ Where, $H_1$ is hermitian and $H_2$ is an anti-hermitian matrix Generating ordered combination of numbers I can form numbers with only 0,2,4,6,8.  The sequence is as follows  0,2,4,6,8,20,22,24,26,28,40,42,.....  How to generate an ordered sequence of numbers from combinations of 0,2,4,6,8. I changed my username and now I cannot play online I don't understand this and I'm now worried as I have donated to a lot of servers and I don't want to lose this account. On the launcher it says my new username but when I log on it says "Account not Authenticated with minecraft.net" and "Non-Valid Username".  How can I regain the ability to use my account online? AutoHotKey: Calling one script from another script Sometimes when attempting to capture a Pokémon, the mon will be wiggling in the ball and the app will disconnect from servers (for mobile connection reasons or whatever), and I'll be left staring at a ball containing Schrodinger's Pokémon. I'll sigh at the loss (or in the case of a 500CP Pinsir, scream in agony), and reload the game.  I thought maybe encounters in general couldn't handle disconnecting well, but sometimes immediately after a Pokémon broke free of a ball, the little icon in the upper left would appear, the game would stall for a bit, but it would recover.   Is there anything I can do to avoid this? Should I be waiting it out, instead of reloading?  (and before anyone says it, yes I have filed a bug report) Access a glyph on fontspec using a GID (Glyph ID) I'm trying to access a glyph, but it's only mentioned in the "Basic Latin and Latin 1" set for a font. The glyph has no name or unicode ID, but it does have a glyph ID or GID. fontspec doesn't mention possibilities for using this glyph. Neither does Adobe in the adobe feature file syntax:   I'd still like to be able to access a glyph through its ID, since it's the only way I can access it (I think).  My specific case requires to access the glyph ID 554 from Stevens Titling Pro Sable Brush. I will only post this font if it's strictly necessary, since I don't like to distribute these fonts to the wide world.  I posted an MWE containing another (free) font. This is not the font I intend to use, but perhaps a starting point to try and access glyphs manually.   \documentclass{article}  \usepackage{fontspec} \setmainfont{EB Garamond}  \parindent=0pt \begin{document}  Some text int EB Garamond. How can I access glyph 123 now?  \end{document} CASE WHEN with GROUP BY I have a table that looks like this (oversimplified case of the actual case to make my point)  CREATE TABLE sales (    id int,    currency VARCHAR(5),    price int    shop_id int );   Now I need to make a query that will give me something like this table, grouping by shops yet giving sum of sales per currency My problem is when I make currency column non aggregate it fails because my query becomes non standard. When I add currency to group by then each currency creates new row, something I don't want. I have run out of option and would appreciate any help or pointer to the right direction.  I use MySQL but would appreciate if I would get the solution that works with more databases (PostGreSQL being at the top of the list after MySQL)  Query that works with undesired results  SELECT   shop_id,           (CASE WHEN currency= "GBP" THEN SUM(price) ELSE 0 END) AS POUND,           (CASE WHEN currency= "USD" THEN SUM(price) ELSE 0 END) AS USDOLLAR GROUP BY shop_id, currency   The data that should be produced by the query  shop_id     |   POUND   |   USDOLLAR     -----------------------------------------     1       |   400     |   300 -----------------------------------------     2       |   250     |   100 -----------------------------------------     3       |   400     |   100 ----------------------------------------- When is the order of convergence of Newton-Raphson greater than 2? If some function $f$ has a simple root at $x_*$ then I know that the order of convergence of the Newton-Raphson iteration is at least 2. But when is this order strictly greater than 2? Underlined math in a Beamer presentation: felt-tip marker underlining How do I select text nodes with jQuery? I would like to get all descendant text nodes of an element, as a jQuery collection. What is the best way to do that? $\mathbb{Z}[X]/(X^2-1)$ is not isomorphic with $\mathbb{Z}\times \mathbb{Z}$ I have to show that the ring $\mathbb{Z}[X]/(X^2-1)$ is not isomorphic with $\mathbb{Z}\times \mathbb{Z}$.    I know that $(\mathbb{Z}\times\mathbb{Z})^*=\{(\pm1,\pm1)\}$, so I thought I should be looking for elements which have inverses in $\mathbb{Z}[X]/(X^2-1)$ and hopefully find more or less than 4. But I didnt succeed, so I need hints. Thanks. Anomalous community user activity On the meta home page I noticed the  is listed as doing something, but cannot figure out what it is.  There is nothing on the  or its , but the recent activity is listed with the same timestamp. How can I make Firefox open magnet-links in Transmission? I can't find out how to make Firefox open magnet-links in Transmission.   There is no option to make it the standard program for magnet-links in its properties, and as I am not experienced with the filesystem so I can't add it as the standard program in Firefox either. If refraction slows down light, isn't it possible to hold light still? I have a quick question about the refraction of light, and I'm sorry if it seems a bit simplistic or even stupid, but I'm still learning.  We know that when light passes through a denser medium, it slows down. However, is there a limit to that slowing down? If no, wouldn't it be possible, with some type of medium we make ourselves (like a crystal), to decrease the light's speed down to a point where we would be able to "see the photons moving forwards"?  I know it is way more complicated than that and that you can't see light unless some other light bounces off it, what I mean is slowing down light to an extreme and unusual speed). That sounds completely absurd but I can't seem to find what is wrong. Can anyone can explain it to me? :) I'm having troubles with rendering my datatable correctly. There are actions added but it seems the datatable is not high enough to view it correctly. Is it something I'm doing wrong? Or is it a bug?    This is the code for the datatable  &lt;div class="slds-text-heading_medium"&gt;Search results&lt;/div&gt; &lt;lightning:datatable data="{! v.persondata }"                      columns="{! v.personcolumns }"                      keyField="id"                     onrowselection="{! c.getSelectedPerson }"                     hideCheckboxColumn="true"  /&gt;   Here is the code for initializing the columns  //init datatable component.set('v.personcolumns', [             {label: 'Last Name', fieldName: 'LastName', type: 'text'},             {label: 'First Name', fieldName: 'FirstName', type: 'text'},             {label: 'Mailing Zip/ Postal Code', fieldName: 'PersonMailingPostalCode', type: 'text'},             {label: 'Mailing City', fieldName: 'PersonMailingCity', type: 'text'},             {label: 'Billing Street', fieldName: 'PersonMailingStreet', type: 'text'},             {label: 'Email', fieldName: 'PersonEmail', type: 'text'},             {label: 'Primary Phone', fieldName: 'PersonHomePhone', type: 'text'},             {label: 'Secondary Phone', fieldName: 'PersonOtherPhone', type: 'text'},             {type: 'action', typeAttributes: { rowActions: actions}}         ]);   And the code for adding data (the response is a list of Accounts)  component.set('v.persondata',response.getReturnValue()); What is the integral of 1/x? What is the integral of $\frac{1}{x}$? Do you get $\ln(x)$ or $\ln|x|$? In general, does integrating $f'(x)/f(x)$ give $\ln(f(x))$ or $\ln|f(x)|$? Also, what is the derivative of $|f(x)|$? Is it $f'(x)$ or $|f'(x)|$? biblatex, biber, is it possible to \printbibliography between two years? With biblatex and Biber, is it possible to print all the bibliography (\printbibliography) from (let's say) 2003 to 2008 in one section? And then in another section print all the bibliography from 2009 to 2016? Duplicate notifications I receive every push notification from the iOS app twice on iPhone. The second comes immediately after the first. This happens every single time.   I also have the app installed on an iPad and signed in to the same account - could this be a possible cause?   App Version: 1.4.0 Device: iPhone7,2 OS Version: Version 9.1 (Build 13B143) Why do we need Diffie Hellman? Diffie–Hellman offers secure key exchange only if sides are authenticated. For authentication, sides are using public/private key. So if side A knows the public key of the side B, then A can simply use that key to encrypt the message (or the new session key).  Why bother to use separate key exchange algorithm? Convince grep to output all lines, not just those with matches Say I have the following file:  $ cat test  test line 1 test line 2 line without the search word another line without it test line 3 with two test words test line 4   By default, grep returns each line that contains the search term:  $ grep test test  test line 1 test line 2 test line 3 with two test words test line 4   Passing the --color parameter to grep will make it highlight the portion of the line that matches the search expression, but it still only returns lines that contain the expression. Is there a way to get grep to output every line in the source file, but highlight the matches?  My current terrible hack to accomplish this (at least on files that don't have 10000+ consecutive lines with no matches) is:  $ grep -B 9999 -A 9999 test test     If grep can't accomplish this, is there another command-line tool that offers the same functionality? I've fiddled with , but it doesn't seem to have an option for it either.