How did Fred and George know what to say to open the Marauders Map?
How could Fred and George have figured the exact password to the Marauder's map?
Is the ideal $(2,X+1)\subset\Bbb{Z}[X]$ prime, maximal or neither? I'm currently considering the ideal $(2,X+1)\subset\Bbb{Z}[X]$. I'm trying to figure out if this is a prime ideal, a maximal ideal, or neither. So far I have attempted to look at the quotient ring $\Bbb{Z}[X]/(2,X+1)$. I know that if this quotient ring is a field, then our ideal is maximal, since $\Bbb{Z}[X]$ is commutative. However I'm stuck on how I should be viewing this quotient ring. How to enable projection transformation in QGIS My QGIS project has two layers, one layer is retrieved by Google layer plugin which fetches the static Google map image whose CRS is +proj=merc +lon_0=0 +lat_ts=0 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +units=m +no_defs and another vector layer is a postgis layer whose CRS is +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs.  I digitalized some polygon features from Google Layers and added it to the vector layer. However, QGIS seems do not make the automatic CRS transformation. How can I change its projection?   Thanks How can I put the computer to sleep from Command Prompt/Run menu? I know that almost everything on Windows, like opening any sort of application, can be done from the command prompt or from the Run menu.  How can I put my computer to sleep or shut it down? What is the command for that? Capitalisation of "Section" and "Chapter" in a Ph.D. Thesis I am submitting a Ph.D. thesis fairly soon and my supervisor has flagged my use of capitalisation in "Section" and "Chapter" as possibly incorrect. I have googled about a bit and I see mixed opinions.  So my question is, when writing a computer science Ph.D. thesis, what is the correct way to capitalise "Section", "Chapter", "Appendix", "Figure", "Table", ... ?  For example, what is the correct capitalisation for the following:   "In Chapter 3, it was shown that..." "In the previous Section, a method was presented to..." "The graph in Figure 3 shows..." How to format/partition SD card? How can I format or partition SD card in Kubuntu?  Is there an application with GUI for this? Should I install the play disc or not? I hear both sides of the story. "Installing both discs will improve performance" or "Playing from the disc is best".  I've come across a few threads that say to install the play disc to a USB drive. Will the Xbox 360 even read from 2 different sources at once?   Someone please clear this up for me, for all of us.  Do I Install the second "play" disc or not, and why? Custom blocks created as a plugin in a module not showing for Block::load() I have a couple of blocks that have been created using the ... extends BlockBase syntax in my module. They work perfectly fine, and I can add them on the blocks layout page, can add them into DS as a field, etc. They definitely exist fine.  However, when I try and render them using Block::load(), they won't show up, unlike other blocks that work fine.  For example, if I have the following docblock:  /**  * Provides a 'Cute Cats' Block.  *  * @Block(  *   id = "cute_cats",  *   admin_label = @Translation("Cute cats yo"),  * )  */  class CuteCats extends BlockBase { ... }   ... and then try and call it like this:  $block = \Drupal\block\Entity\Block::load('cute_cats'); return render(\Drupal::entityTypeManager()   -&gt;getViewBuilder('block')   -&gt;view($block));   Any idea why? Thanks in advance. form_state->setRedirect(to_a_new_node_page) from the submitForm function, route "does not exist" issue I created a custom module, It generate a custom Form in a page. When I submit my form, I create a new node. So, I am redirect to the form page but I would like be redirect to the new node page.  I add this line at the end of my submitForm function :   $form_state-&gt;setRedirect('node/'.$mynewnode-&gt;id());   But when I submit my form from the website, I get the empty-white-screen-of-the-death. My apache log :   ... Uncaught PHP Exception Symfony\\Component\\Routing\\Exception\\RouteNotFoundException: "Route "node/153" does not exist. ...   And then, when I go manually to the node/153 page, there isn't any problem. The page work well.   My question : where is my mistake ? How can I set the redirection after create the new node ? Is it possible from the submitForm function ? Why do this() and super() have to be the first statement in a constructor? I need to calculate the following indefinite integral:  $$I=\int \frac{1}{\cos^3(x)}dx$$  I know what the result is (from Mathematica):  $$I=\tanh^{-1}(\tan(x/2))+(1/2)\sec(x)\tan(x)$$  but I don't know how to integrate it myself. I have been trying some substitutions to no avail.   Equivalently, I need to know how to compute:  $$I=\int \sqrt{1+z^2}dz$$  which follows after making the change of variables $z=\tan x$. Grandi's Series; tends to $1/2$, but why is this considered a valid sum? Where to put my code: plugin or functions.php? Is there an easy to understand scheme to decide what kind of code belongs to a plugin or the theme’s functions.php?  There    and many  about that topic, mostly because there are some misconceptions about the inner workings of WordPress. I am asking for an answer based on facts, not on opinions.  It should explain how to handle these points (and probably more):   custom post types and taxonomies contact forms shortcodes custom widgets  SEO functions like custom meta elements theme switch   There are often pros and cons for both sides. Our most popular question  got a lot of code snippets as answers that are at least debatable. We need criteria a beginner can understand, maybe a check list – with reasons.  See also the related question by Chip Bennett on our meta site:   Related: "He saw it stop and his son get out" I have been reading Men With Brooms for a few days. I read a sentence which did not make any sense to me, so I landed here to get some help on it. I have pasted the sentence from the novel. Please go through it and let me know your valuable feedback on it.  An excerpt from the novel (Men With Brooms: A Sweeping Epic, paperback 2002, a novelization by Diane Baker Mason):     Gordon was about to walk away from the Impala when he saw it stop and his son get out. So it was real the boy had come.   As per my opinion it should have been:     Gordon was about to walk away from the Impala when he saw it stopped and his son got out. So it was real the boy had come.   I have two questions here:   Why did the writer use stop and get instead of stopped and got? As she is telling us a story which happened in the past. Let's say the writer is telling us her mind's situation and she used the present tense for it but why did she use stop and get instead of stops and gets? I want to display from cache for a long time and I want a slightly different behavior on page render vs loading the page from cache.  Is there an easy way I can determine this with JavaScript? Are there rules for creating level 0 characters? Are there rules for creating level 0 characters in 5e? I've been running a campaign where the players begin sub-standard and 1st Level characters are generated in-game as the story unfolds. I just made them all begin with a couple of hp and 9's across the board for ability scores (since I wanted them at a disadvantage compared to the average human, and to fail at a generic DC10 task more often than succeed).  It was a real grind, with many opportunities for TPK (total party kill) when faced with even a single challenge rating 1/2 adversary (obviously I fudged the dice a little to prevent this). Are there published rules for this?  If there aren’t published rules for this, has anyone tried doing something like this? Any first hand experience on how it has played out would be welcome. In Java, how do I call a base class's method from the overriding method in a derived class? I just installed Ubuntu 12.10 (amd64), and want to install a recent version of MySQL 5.6.  If possible, I would like to install (not upgrade) it the "Debian Way' (i.e., using apt-get or dpkg). Do I need a RHEL subscription to install packages? Explicit example of a compact manifold of dimension $>2$ with strictly negative sectional curvature I am looking for examples of compact manifold of dimension $&gt;2$ with strictly negative sectional curvature (for dimension 2 it is well-known). Can anybody please help? remove files when name does NOT contain some words