I was reading about Future methods in Salesforce and had this query - Is there any reason why future methods should be static and void?
I am new to Salesforce and hence a lot of silly questions. What is the rational behind defining future methods as Static? I mean has these methods been not static what harm would have they caused?
Torsion on $\pi_1(X)$, $X$ connected and open in $\mathbb{R}^n$ Can the fundamental group of an open connected subset $X$ of $\mathbb{R}^n$ have a torsion element? Why the CMB has not been dispersed so far? Imagine you have a box of black body radiation. What happens if you open the box for a long time? It becomes dispersed and no radiation remains in the box.   Now, apply this example to the Cosmic Microwave Background radiation. The CMB has been produced about 380,000 years after the Big Bang. Giving that the space is flat as many observations suggest, that radiation has been produced in a universe with no boundaries.   Now, my question is this: in these conditions, why that radiation has not been dispersed completely so far? It is true that the radiation has been produced everywhere in the space but giving that the space is infinite, why has not it been dispersed do far?   Calculations in the standard textbooks are done in such a way as if the CMB has been within a physical box, however expanding with the universal expansion. But, this is not the actual situation. The CMB has not been and is not enclosed by walls of a box, so it must have completely dispersed so far. What has prevented this to happen? A smooth vector field on $S^2$ vanishing at a single point How to transfer between International T2 to Domestic 1B terminals in Mumbai? I will be arriving in Mumbai Terminal T2 on a Turkish Airlines international flight. I have a separately-purchased IndiGo ticket 5 hours later from Terminal 1B (Domestic). In the past I heard of a free bus to transfer.    Is that still the case and if not how do I get to Terminal 1B from Terminal 2? Compiling with either XeLaTeX or LuaLaTeX, \emph{} no longer displays text as expected, i.e. in italics. \textit{} works fine. Here is a MWE demonstrating the issue.  \documentclass{article}  \usepackage{fontspec}  \begin{document}      \emph{lorem ipsum}      \textit{lorem ipsum}  \end{document}   Here is the output I get :   I have TeXLive 2016 (MacTeX) installed. I updated it an hour ago with sudo tlmgr update --self --all.  I guess there is something wrong but what ? I'd be happy to have some help. Thank you. In Drupal 8 you can load an entity with:  $node = \Drupal::entityManager()-&gt;getStorage('node')-&gt;load(123);   This looks for the entity definitions and finds that node is defined by Drupal\node\Entity\Node - so (I guess) Drupal\node\NodeStorage will instantiate a new Drupal\node\Entity\Node instance.  What I'd like to achieve is subclassing Drupal\node\Entity\Node and being able to instantiate this subclass when it's appropriate. For example if I have a node bundle article, there would be a class:  namespace Drupal\my_module\Entity\Article; class Article extends Drupal\node\Entity\Node { }   And I'd call:  $node = \Drupal::entityManager()-&gt;getStorage('node_article')-&gt;load(123);   And the return would be my Article subclass.  I can achieve this by creating a new entity type and wiring it back to another existing entity definitions, for example the node-article example would be this class:  namespace Drupal\my_module\Entity; use Drupal\node\Entity\Node; /**  * @ContentEntityType(  *   id = "node_article",  *   label = @Translation("Content"),  *   bundle_label = @Translation("Content type"),  *   handlers = {  *     "storage" = "Drupal\node\NodeStorage",  *     "storage_schema" = "Drupal\node\NodeStorageSchema",  *     "view_builder" = "Drupal\node\NodeViewBuilder",  *     "access" = "Drupal\node\NodeAccessControlHandler",  *     "views_data" = "Drupal\node\NodeViewsData",  *     "form" = {  *       "default" = "Drupal\node\NodeForm",  *       "delete" = "Drupal\node\Form\NodeDeleteForm",  *       "edit" = "Drupal\node\NodeForm"  *     },  *     "route_provider" = {  *       "html" = "Drupal\node\Entity\NodeRouteProvider",  *     },  *     "list_builder" = "Drupal\node\NodeListBuilder",  *     "translation" = "Drupal\node\NodeTranslationHandler"  *   },  *   base_table = "node",  *   data_table = "node_field_data",  *   revision_table = "node_revision",  *   revision_data_table = "node_field_revision",  *   translatable = TRUE,  *   list_cache_contexts = { "user.node_grants:view" },  *   entity_keys = {  *     "id" = "nid",  *     "revision" = "vid",  *     "bundle" = "type",  *     "label" = "title",  *     "langcode" = "langcode",  *     "uuid" = "uuid",  *     "status" = "status",  *     "uid" = "uid",  *   },  *   bundle_entity_type = "node_type",  *   field_ui_base_route = "entity.node_type.edit_form",  *   common_reference_target = TRUE,  *   permission_granularity = "bundle",  *   links = {  *     "canonical" = "/node/{node}",  *     "delete-form" = "/node/{node}/delete",  *     "edit-form" = "/node/{node}/edit",  *     "version-history" = "/node/{node}/revisions",  *     "revision" = "/node/{node}/revisions/{node_revision}/view",  *   }  * )  */ class Article extends Node { }  // Results my Article sub type. $node = \Drupal::entityManager()-&gt;getStorage('node_article')-&gt;load(123);   This works fine (as much as I can see); however, it smells. It adds a new entity type, which is not true, and might cause other troubles in the future.  How do I define a subclass for an entity bundle so that loading the entity would return an object of that class? Difference between standard error and standard deviation I'm struggling to understand the difference between the standard error and the standard deviation. How are they different and why do you need to measure the standard error? I recently bought a new laptop with following configuration   CPU: Intel i5 2450 RAM: 8 GB DDR3 GPU: NVIDIA GeForce GTX 520 1GB   I've setup a virtual machine using VirtualBox with Windows 7 as guest. I want to use my (host's) graphics card in it but the virtual machine is only showing 128 MB of video memory.  I am using Bumblebee and start the virtual machine using   $ optirun VBoxManage startvm "Windows 7"   Please suggest me how should I use my graphics card for 3D acceleration in virtual machine. I can't connect to a friend's Minecraft server, but none of the usual culprits seem to be the problem How do I use jpnevulator to capture and log the serial traffic between an application and hardware serial port? OK, I've been googling for hours so I obviously have not been able to understand the answers to the various questions that have already been asked about this subject.  I am hoping that, by asking the question again in a more specific way, I will be able to get an answer I can understand.  I have some application running in linux that communicates with an external device attached to a serial port.  I want be able to capture and log the data sent in both directions between the application and the device, with timestamps at the beginning of each line in the file.  As a test case, I am using minicom as the application I want to monitor, connected via a null modem cable to another computer also running minicom.  I have already confirmed that, if I type characters on either of the computers, characters appear in the other computer's terminal.  So far, so good.  I then found this question:    In the answer to this question, the program jpnevulator is suggested.  However, when reviewing the man page, I could not figure out the right way to use jpnevulator to get what I want.  Here is what I tried to do:  First, I opened a terminal window and typed the following command:  $jpnevulator --tty=/dev/ttyS0 --pty --pass --read --ascii --timing-print --file=serial.log   I saw the output:     jpnevulator: slave pts device is /dev/pts/18  I then opened another terminal window and typed the following command:  minicom -D/dev/pts/18 -b115200   Minicom opened without complaint.  However, when I typed characters in either terminal (local and remote), nothing appeared in either terminal.  jpnevulator only logged the data written to /dev/pts/18.  My expectation is that jpnevulator :   reads data from /dev/pts/18 and "passes" this data on to /dev/ttyS0 while also writing this data to the specified file. reads data from /dev/ttyS0 and "passes" this data on to /dev/pts/18 while also writing this data to the specified file.   I am aware of the remark in the faq that says "Jpnevulator was never built to sit in between the kernel and your application. I'm sorry."  However the very same faq states in the second paragraph down: "Now with a little bit of luck some good news: A little while ago Eric Shattow suggested to use pseudo-terminal devices to sit in between the kernel and your application."  That is the approach I am trying to take but I am having no success.  What am I missing?  Thanks to all in advance.  Cheers, Allan  p.s. I was successfully able to capture the back and forth traffic using the socat method mentioned in the existing question I referenced but this method did not offer any way of timestamping the traffic.  I was hoping that jpnevulator would have provided this for me. Continued fraction of $e^{-2\pi n}$ I found this problem on a well-known problem solving website. It is apparently from Ramanujan.     With   $$\LARGE{a = \frac{1}{1 + \frac{e^{-2\pi}}{1 + \frac{e^{-4\pi}}{1 + \ddots}}}},$$   what is $a$?   The basic methods I know for questions of this type were not helpful to me.  I do not require a full solution, but feel free to post one if you would like. Hints or lecture notes on how to solve problems of this nature would be appreciated.   Keep in mind that I am at an undergraduate level in mathematics. This may be a stupid or trivial question, but I am new to Ubuntu, and have two unsolved problems (flashplayer doesn't play, and scanner doesn't work - in virgin install 13.04), so I started to search in documentation. In the 13.04 specific web site I was browsing the hardware section, and came across something like this: "Open Dash, and select Disk Utilities".  So what is Dash, and where is Disk Utilities?  The application finder could not find any of those. In terminal the "dash" command seems to invoke some sort of a shell. A regular expression to exclude a word/string How can I know if my post(comment, answer, question) was Flagged? Is it possible to see if my post was flagged. The only way as I see it, if you see your post has got deleted, them may be someone might have flagged it for moderation. But is there other way to see if your post was flagged for moderation.   I am wondering if someone's is repeatedly flagged for posts, maybe he can be assigned a badge(bad one :) )  But right now, I want to know if it is possible to see how many posts of mine were flagged. It seems syntax highlighting is not enabled on every SE site, but later on turns out to be rather advantageous. As an example,  may not have sounded like needing it, yet there is , and I think it's justified since many answers have code in them, e.g. JS for InDesign scripts, some GREP-regex and (rather obviously) HTML and CSS. While I'd appreciate having syntax highlighting activate on that specific site (so please upvote ), this question is more general about two points:   Why is syntax highlighting disabled on some sites at all? Are the additional resource costs really so high? Couldn't caching improve that then? How to actually proceed when it should become activated on a specific site? It seems feature requests on the specific meta site are not exactly handled quickly (the request mentioned above is from 2013!), and also appear overkill for a simple "please switch that site's config bool for syntax highlighting". I want to make a power DC supply with voltage rating 0-200V. I want it to be a variable power supply with voltage from 1V to 200v. What should be my approach? Is a URL with a query string better or worse for SEO then one without one? I want to know, is there a huge difference in terms of SEO between these URLs:  example.com/ontario/toronto/listings   or  example.com/listings.php?p=ontario&amp;c=toronto   Will one URL rank higher than the other? Is there a huge difference here? How to install Flash player on Ubuntu? Even though I have the latest Adobe Flash player 11.2 for Linux in Firefox -   - a particular online flash game still requests that I update to the latest flash player.  I've tried this online game on my laptop (Windows 8 with Flash Player 11.8) and it has no problems.  Is there a way to trick Ubuntu or this game into thinking Flash Player 11.8 is "installed"? SD card not showing files when connected to pc When my phone MOTOROLA G3(2015) is updated to Marshmallow, its not showing files when connected to PC. While connecting, it shows options as charing only, PTP, MTP, MIDI. When I select MTP, it shows the external card, but not showing the contents, where as internal memory is detected and all files are shown. If every eigenvector of $T$ is also an eigenvector of $T^{*}$ then $T$ is a normal operator Let $V$ be a finite-dimensional inner product space over $\mathbb{C}$ and $T: V \to V$ a linear transformation.   Show that if every eigenvector of $T$ is also an eigenvector of $T^{*}$ then $T$ is a normal.   We need to show that $\forall v \in V,\ TT^*v=T^*Tv$.  I started by picking $v$ to be an eigenvector of $T$, hence $Tv=\lambda_1 v$, and $T^*v=\lambda_2 v$. Therefore: $$TT^*v=T(\lambda_2 v)=\lambda_2 Tv=\lambda_1 \lambda_2 v=...=T^*Tv$$  But I'm stuck when $v$ is not an eigenvector.  (Also, this question is taken from a chapter about Jordan forms, but I can't see how it relates)