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NSXMLParser chokes on ampersand & I will try to be as explanatory as possible with my question. Please also note that I have done my share of googling and I am looking for simple language preferable with some example so that I can get some insight in this subject.  My question is what is so special about $c$? Why only $c$. Its like chicken and egg puzzle for me. Does Einstein reached to $c$ observing light or does he got to light using some number which turned out equal to $c$.   Why is $c$ not relative. If something has zero rest mass like a photon why they only travel at $c$ in vacuum and not with $c+1$ or $c-1$? Shouldn't the association bonus acquired via serial upvoting be reversed? When a user's rep gets bloated because of serial upvoting, and as result the user is given the association bonus, shouldn't that association bonus also be reversed in case of serial upvoting reversal? I cannot install any package. It seems the command apt-get update must be run but it throws some errors:  $ sudo apt-get update Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]      Hit:2 http://ve.archive.ubuntu.com/ubuntu xenial InRelease                      Hit:3 http://ve.archive.ubuntu.com/ubuntu xenial-updates InRelease              Hit:4 http://ve.archive.ubuntu.com/ubuntu xenial-backports InRelease            Fetched 102 kB in 23s (4337 B/s)                                                *** Error in `appstreamcli': double free or corruption (fasttop): 0x000000000210f4b0 *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fac8d8317e5] [...] Aborted (core dumped) Reading package lists... Done E: Problem executing scripts APT::Update::Post-Invoke-Success   'if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli;   then appstreamcli refresh &gt; /dev/null; fi' E: Sub-process returned an error code Loading a .X model in DirectX 9 Why is my text pixelated? Within my game I have some cubes with text which render fine. In addition to the cubes I want to display some static text, e.g. the current score. The score text has the camera as parent and a copy rotation constraint on the camera. While this concept works fine in principle, the score text is displayed very pixelated. I already increased the font size to 50 and made the text smaller by scaling it down, but it still doesn't show nicely. The score text is about 11 Blender units away from the camera. If I move the score text further away, it displays better, but then the text interferes (collides) with the cubes. What could I do to improve the quality of this text? Download . Open the SSCCE in Blender 2.70. Hover your mouse over the 3D viewport. Press P to start game engine. Is it possible to tell when statistics were last accessed by a query using T-SQL? I'm trying to ascertain what statistics are involved in a query, I know I can check the visual query plan but I wondered whether there was a table (or tables) with this information. Bullied boy given immense powers by an alien race who destroys the human race Looking to identify a short story I read in a sci-fi anthology as a child, about an angry, bullied somewhat misanthropic boy who is given immense near-omnipotent powers by an alien intelligence. I read this in English, sometime in the late 1990s/early 2000s. He goes on to use this power to destroy the human race, which causes him to age terribly in a very short amount of time. At the end of the story he is a lonely old man stripped of the powers he held briefly, and is alone on an isolated Earth. The aliens then proceed to invade Earth. do { ... } while (0) — what is it good for? Possible Duplicate:          I've been seeing that expression for over 10 years now. I've been trying to think what it's good for. Since I see it mostly in #defines, I assume it's good for inner scope variable declaration and for using breaks (instead of gotos.)  Is it good for anything else? Do you use it? "Startup Applications" not working I have a simple one line command which works perfectly in terminal, but does not work in the "Startup Applications" app thing.  The line of code is : xmodmap /home/seph/Code/Ubuntu\ Scripts/Xmodmap  It's not that much of a hassle to copy it from "Startup Applications" and paste it into terminal, but I don't really get why it isn't working.  I followed someone else's instructions to do it in the first place, so maybe I did something wrong?  In any case, wouldn't it be the obvious and logical assumption that it just types whatever you put in it into Terminal? After you get the Reindeer Stables, you can add decorations through a text form to increase production speed. I've added a few decorations myself, but I was wondering what all of them are. I know that some entries seem to be "synonyms". For example, if you enter "wreath" and then "garland", you'll only add the "a Christmas wreath" and trying to put up the garland will return "We already have a Christmas wreath".  These are the decorations I've already added along with discovered synonyms.   Nutcracker (Nutcracker) a Christmas tree (tree) baubles (bauble) glass ornaments (ornament) a star (star) Christmas lights (lights) a Christmas wreath (wreath, garland) mistletoe (mistletoe) a Christmas stocking (stocking) candy canes (candy cane) a chimney decoration (chimney, fireplace) a Santa decoration (santa) an elf decoration (elf) a reindeer decoration (reindeer) a nativity scene (stable) toys (toy) wrapping paper (wrap) candles (candles) tinsel (tinsel) a star (star) an angle (angle) holly (holly) paper chains (chains) Christmas crackers (cracker) Christmas cards (card) a figure of Mary (mary) a figure of Joseph (joseph) a figure of Jesus (jesus) wise men figures (wise men) a donkey decoration (donkey) a sleigh decoration (sleigh) a snowman (snowman) snow decoration (snow) Santa hats (hat) bells (bell) ribbons (ribbon) a turkey decoration (turkey) ? Identity involving Euler's totient function: $\sum \limits_{k=1}^n \left\lfloor \frac{n}{k} \right\rfloor \varphi(k) = \frac{n(n+1)}{2}$ Let $\varphi(n)$ be Euler's totient function, the number of positive integers less than or equal to $n$ and relatively prime to $n$.    Challenge: Prove  $$\sum_{k=1}^n \left\lfloor \frac{n}{k} \right\rfloor \varphi(k) = \frac{n(n+1)}{2}.$$   I have two proofs, one of which is partially combinatorial.    I'm posing this problem partly because I think some folks on this site would be interested in working on it and partly because I would like to see a purely combinatorial proof.  (But please post any proofs; I would be interested in noncombinatorial ones, too.  I've learned a lot on this site by reading alternative proofs of results I already know.)  I'll wait a few days to give others a chance to respond before posting my proofs.  EDIT: The two proofs in full are now given among the answers. I need to make a small correction in a video I uploaded to YouTube. Googling shows that this is not possible. However, I remember seeing it done before. I posted a comment on a video saying that a certain part of the video was missing. I got a reply back that it was fixed, and when I went to see the video again, it was changed. How was this done? I have come across the following few questions on past exams papers.. I know how to solve these type when it is of the form $a_nz^n$ but don't have a clue what to do with these. Any help would be greatly appreciated!  (i) $\displaystyle\sum_{n=0}^\infty \bigg(\dfrac{1}{2n}\bigg)z^{3n}$.  (ii) $\displaystyle\sum_{n=0}^\infty(2^n+i)(z-i)^n$.  (iii) Show that the radius of convergence of $\displaystyle\sum_{n=0}^\infty z^{n!}$ is $1$ and that there are infinitely many $z \in \mathbb{C}$ with $|z|=1$ for which the series diverges. How do I reset my Unity configuration? I've been messing around with Unity and broke something, how do I "start over"? Why is OpenJDK 10 packaged as openjdk-11-*? While looking to compile OpenJDK from source, the newest General Availability version () insists on OpenJDK 9 or 10.  JDK 11, however, is not due to be released until .    However, to my surprise, when I do apt search openjdk the result is:  ... openjdk-11-jdk - OpenJDK Development Kit (JDK) ... openjdk-8-jdk - OpenJDK Development Kit (JDK) ...   No OpenJDK 9 or 10!  And wait, is that OpenJDK 11?  Maybe a Beta release?  Nooo....  So I looked at apt show openjdk-11-jdk:  Package: openjdk-11-jdk Version: 10.0.1+10-3ubuntu1 ...   Why has OpenJDK 10 been packaged as openjdk-11-*?? Six simple tips to get Stack Overflow reputation fast From "6 Simple Tips to Get Stackoverflow Reputation Fast" at codexon.com:   Be the First to Answer. Even at the cost of quality. Use Downvotes and Comments Strategically Use obnoxious in-your-face formatting and lists. Be Aware of the 200 rep/day Limit Edit, But Don’t Edit Too Much Associate your other accounts   Courtesy of . Agree? Disagree? Walnuts? Cantaloupe? How do I install a fingerprint reader on Lenovo ThinkPad? Continuous injective map is strictly monotonic Why won't Amanita move in and settle down?