In Harry Potter and the Deathly Hallows, we find out when Ron returns to Harry and Hermione that Lord Voldemort put a taboo on his alias.   We see that this works in the chapter "A Place To Hide" when two Death Eaters find the trio near Tottenham Court Road after Harry says "Voldemort," so this taboo is already in place and working by later on in the same chapter.  After some debate, the crew decide to hide at Grimmauld Place; we know that there are certain enchantments to protect it against Snape already. Once inside, Harry's scar begins to hurt because of Voldy's anger, and Hermione says his name: "Otherwise Voldemort can plant false images in your head, remember." But no Death Eaters find them in Grimmauld Place.   Why is this? Have I missed something or did JKR make a mistake?
In Harry Potter and the Prisoner of Azkaban, Harry sneaks into The Three Broomsticks and overhears Madam Rosmerta, the Minister for Magic, and several Hogwarts teachers discuss his parents' death and the fact that the Potters were under the protection of the Fidelius Charm. Professor Flitwick explains the charm:     ‘An immensely complex spell,’ he said squeakily, ‘involving the magical concealment of a secret inside a single, living soul. The information is hidden inside the chosen person, or Secret-Keeper, and is henceforth impossible to find – unless, of course, the Secret-Keeper chooses to divulge it. As long as the Secret-Keeper refused to speak, You-Know-Who could search the village where Lily and James were staying for years and never find them, not even if he had his nose pressed against their sitting-room window!’   Prisoner of Azkaban - pages 152-153 - Bloomsbury - chapter 10, The Marauders Map   In Harry Potter and the Deathly Hallows, once Ron returns to Harry and Hermione after his and Harry's fight weeks earlier, he tells Harry and Hermione about the Taboo:     ‘NO!’ roared Ron, causing Harry to jump into the hedge and Hermione (nose buried in a book at the tent entrance) to scowl over at them. ‘Sorry,’ said Ron, wrenching Harry back out of the brambles, ‘but the name’s been jinxed, Harry, that’s how they track people! Using his name breaks protective enchantments, it causes some kind of magical disturbance – it’s how they found us in Tottenham Court Road!’   ‘Because we used his name?’   ‘Exactly! You’ve got to give them credit, it makes sense. It was only people who were serious about standing up to him, like Dumbledore, who ever dared use it. Now they’ve put a Taboo on it, anyone who says it is trackable – quick and easy way to find Order members! They nearly got Kingsley –’   Deathly Hallows - page 316 - Bloomsbury - chapter 20, Xenophilius Lovegood   So in hindsight the trio understands that it was the Taboo that caused the Death Eaters to find them at Tottenham Court Road, and then later, of course, they're caught by Snatchers because Harry says "Voldemort" out loud. However, the trio says "Voldemort" numerous times while they're staying at Grimmauld Place and Death Eaters appear and stake the place out (granted, it could be that the Death Eaters simply knew that Harry had inherited Grimmauld Place from Sirius after the Ministry examined Sirius's will). They cannot get inside the house, though. I'm completely unclear as to the status of Grimmauld Place and the Fidelius Charm -- the house was under the charm, but the Secret Keeper (Dumbledore) had died. Nevertheless, like eleventy-one people were privy to the secret by the time of Dumbledore's death, and I have never found a satisfactory answer (to me) to exactly how the Fidelius Charm works.   Would Voldemort's Taboo spell be able to trump the Fidelius Charm?  &#9733; I'm looking for a canon-based answer (Harry Potter novels, the three supplemental books, JKR interviews, and Pottermore) and do not prefer an answer from the HP Wikia or the Wikipedia.
How to draw arrows between circled coefficients of polynomials using tikz What does the "Current event" post notice mean? The recently introduced &quot;Current event&quot;  feels incomplete:  At the very least, it needs a period at the end to complete the sentence. Aside from that, what is a future visitor of a question supposed to take away from this notice? The &quot;citation needed&quot; text explains what expectations are placed on the question bearing the notice and invites action. Is the &quot;current event&quot; notice purely informational? What's the desired effect of adding it to a question? The current on-question notice is:  This post relates to a rapidly changing event.  In addition to answering those questions, I'm hoping we can work out a proposal for a wording change to make it more clear. I can't come up with anything to start with, since I don't quite get what the notice is supposed to achieve in the first place. Condition on a,b and c satisfying an equation(TIFR GS 2017) Let $a,b,c$ be positive real numbers satisfying $$(1+a+b+c)\left(1+\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\right)=16,$$ then $a+b+c=3$.  I thought about the application of the AM-GM-HM inequality, but in vain. I also thought about splitting 16 into factors and comparing but went nowhere. Any ideas. Thanks beforehand. I have just finished my undergraduate studies. During last two semesters I've taken two subjects dealing with manifolds:   Analysis on manifolds, containing: definition of manifold, tangent space (as derivations and classes of curves), vector fields, vector bundles, flows, Lie derivatives, integration on manifolds (Stokes theorem), forms, Hodge decomposition theorem Introduction to differential geometry (for me it should be called introduction to Riemannian manifolds) containing: tensor calculus introduction, Riemannian manifold definition, connections, curvatures, geodesic, normal coordinates, geodesic completness theorem, classification throught curvature, jacobi fields, harmonic maps.    Now, for me differential geometry was/is a theory about manifolds, so anything dealing with manifolds is branch of differential geometry. On the other hand I am preparing for taking part in local conference called: "algebraic and differential topology".  I have read: ,  ,  , yet I still don't really know if differential topology is subtheory of differential geometry or is it seperate theory and how is it located between differential geometry and algebraic topology. For example I expect that studies on Riemmanian manifolds are part of differential geometry but would problem of classification manifolds up to diffeomorphism be a part of differential topology or geometry ?  Request: I would be grateful for your characterisation of differential topology and differential geometry possibly with examples of problems, theorems present at them. What does DISPLAY=:0.0 actually mean? I want to earn Unicoins for free but I can't seem to find the best way mine coins faster. There are also sometimes when I get 20-30 Unicoins at one time, and I think that there is some clue so that we can know which rocks contain lots of Unicoins.. So do you have any idea you can share? I often find myself wishing SO supported drag and drop. For example I drag a tag to my favs and it would add it, or when searching by tag I would like to drag the tag to the search box and get [asp.net] added in the search box.   Does it make sense to add this feature or is it just too much work for so little use? $f: \mathbb{R} \rightarrow \mathbb{R}$ is a continuous function. Assume that $\lim_{x \rightarrow \pm \infty} f(x)$ exist and are finite. Prove that $f$ is bounded.  So to show that $f$ is bounded, I must show that $\exists M \in \mathbb{R}$ such that $|f(x)| \leq M$ for all $x \in Dom(f)$. Assuming that $f(x)$'s limit exist, then I know that $\forall \epsilon  &gt; 0$, $\exists N$ such that for $n &gt; N$, $|f(n) - L| &lt; \epsilon$. But I am having trouble with figuring out how to connect the two ideas together. Can anyone suggest a detailed installation process for Ubuntu on Windows 8.2? The drawer has M different colored socks. What is the least amount of socks I that I need to draw to guarntee N pairs So in my discrete math class, we all know that if the drawer has 2 different colored socks, you need to pull out 3 socks to ensure a pair.   However, I am puzzled after there are more different colored socks and more pairs of socks.  For example, if there are 3 different colored socks in the drawer and I need to draw out 50 pairs, at least how many socks do I need to draw out to ensure that I have 50 pairs of sock?  How about if there are M different colored socks in the drawer and I need to draw out N pairs, at least how many socks do I need to draw out to ensure that I have N pairs of sock?  Are there any general formulas for these types of problem? Or are there any rules for this type of question? Installing Crystal Reports 8.5 on Windows 7 I have successfully installed Crystal Reports 8.5 on my Windows 7 desktop, but when I try to launch the application i get this:    Any experience with this?  Besides the obvious "update to as newer version", does anyone have any suggestions? Book Recommendation for mathematical finance Does anyone know a book which covers topics on:  Brownian Motion   Martingales   Stochastic Calculus  Stochastic Differential Equations   Options pricing. Black-Scholes model  Fundamental Theorems. Interest Rates   Random Walk   Applications in Insurance   Simulations. Convergence   Simulation methods   I would like something in-depth, but at an undergraduate level. I'm a C++ newbie, but I wasn't able to find the answer to this (most likely trivial) question online.  I am having some trouble compiling some code where two classes include each other.  To begin, should my #include statements go inside or outside of my macros?  In practice, this hasn't seemed to matter.  However, in this particular case, I am having trouble.  Putting the #include statements outside of the macros causes the compiler to recurse and gives me "#include nested too deeply" errors.  This seems to makes sense to me since neither class has been fully defined before #include has been invoked.  However, strangely, when I try to put them inside, I am unable to declare a type of one of the classes, for it is not recognized.  Here is, in essence, what I'm trying to compile:  A.h  #ifndef A_H_ #define A_H_  #include "B.h"  class A {     private:         B b;      public:         A() : b(*this) {} };  #endif /*A_H_*/   B.h  #ifndef B_H_ #define B_H_  #include "A.h"  class B {     private:             A&amp; a;      public:         B(A&amp; a) : a(a) {}  };  #endif /*B_H_*/   main.cpp  #include "A.h"  int main() {     A a; }   If it makes a difference, I am using g++ 4.3.2.  And just to be clear, in general, where should #include statements go?  I have always seen them go outside of the macros, but the scenario I described clearly seems to break this principle.  Thanks to any helpers in advance!  Please allow me to clarify my intent if I have made any silly mistakes! Conky does not work properly on Ubuntu 16.04 GNOME I have this strange problem with conky. It doesn't show properly on the desktop:    I've tried everything from editing conky widget file to reinstalling conky and conky manager (v.2.4). Who knows how to fix it? I am testing against the following test document:  &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"                        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;    &lt;head&gt;         &lt;title&gt;hi there&lt;/title&gt;     &lt;/head&gt;     &lt;body&gt;         &lt;img class="foo" src="bar.png"/&gt;     &lt;/body&gt; &lt;/html&gt;   If I parse the document using lxml.html, I can get the IMG with an xpath just fine:  &gt;&gt;&gt; root = lxml.html.fromstring(doc) &gt;&gt;&gt; root.xpath("//img") [&lt;Element img at 1879e30&gt;]   However, if I parse the document as XML and try to get the IMG tag, I get an empty result:  &gt;&gt;&gt; tree = etree.parse(StringIO(doc)) &gt;&gt;&gt; tree.getroot().xpath("//img") []   I can navigate to the element directly:  &gt;&gt;&gt; tree.getroot().getchildren()[1].getchildren()[0] &lt;Element {http://www.w3.org/1999/xhtml}img at f56810&gt;   But of course that doesn't help me process arbitrary documents.  I would also expect to be able to query etree to get an xpath expression that will directly identify this element, which, technically I can do:  &gt;&gt;&gt; tree.getpath(tree.getroot().getchildren()[1].getchildren()[0]) '/*/*[2]/*' &gt;&gt;&gt; tree.getroot().xpath('/*/*[2]/*') [&lt;Element {http://www.w3.org/1999/xhtml}img at fa1750&gt;]   But that xpath is, again, obviously not useful for parsing arbitrary documents.  Obviously I am missing some key issue here, but I don't know what it is.  My best guess is that it has something to do with namespaces but the only namespace defined is the default and I don't know what else I might need to consider in regards to namespaces.  So, what am I missing? Same question listed twice in reputation list This might not be a bug but I see the same question list twice in my reputation display, I know it is grouping things by a six hour difference, but is this really expected?    The first list says 2 events but shows all 5, similarly the second list says 3 events and shows all five. True\False?  For every matrix $A\in M_{2}( \mathbb{C}) $ there's  $X\in M_{2}( \mathbb{C})$ such that $X^2=A$.  I know that every complexed matrix has a Jordan form matrix $J$ such that $P^{-1}CP=J$, But it's not diagonalizable for sure.  Thanks This is a 2015 IMO problem.  It seems difficult to solve.     Find all triples of positive integers $(a, b, c)$ such that each of the numbers $ab-c$, $bc-a$, and $ca-b$ is a power of $2$.   Four such triples are $(a,b,c)=(2,2,2),(2,3,2),(3,5,7),(2,6,11)$. How to run xrandr commands at startup in Ubuntu Routing Applications sound to different sound device? (Windows)