josh
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 Sep 13 awarded Enlightened Feb 11 awarded Nice Answer Sep 11 awarded Yearling Mar 8 comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) This is fantastic. Feb 17 awarded Custodian Feb 17 reviewed No Action Needed Find the distribution of X, EX, and VarX. Feb 15 comment Paul Erdos's Two-Line Functional Analysis Proof @gnometorule: The "open problems homework" anecdote actually happens to be true, if not as romanticized: snopes.com/college/homework/unsolvable.asp Feb 15 comment Real Analysis Inequality Questions It's easier to work with everything at once. For (a), since you've noticed that $x\cdot y - x\cdot z=||x||(||y||cost-||z||cosk)$, you could use the triangle inequality: $|||x||(||y||cost-||z||cosk|<2(||y||+||z||)<2(3+4)=14$. It looks good to me otherwise. Nov 26 comment What sample size do I need to justify my suspicions? (Note that this depends on the degree of certainty [e.g. 95%] you require before stating your conviction, which could depend on a number of things. See also: xkcd.com/1132) Nov 26 awarded Critic Nov 26 comment Convergence proof-how to apply this theorem? It's bounded because it can only receive two values: 0 and -1. Nov 6 comment Methodology to solve a Math IQ puzzle? Got it, thanks. I misunderstood you at first. Nov 6 comment Which side has winning strategy in Go? A rare diplomatic solution :). Nov 5 comment Methodology to solve a Math IQ puzzle? (This is a laaaate question), how do you consider the remainders? Sep 11 awarded Yearling Jun 4 awarded Nice Answer May 22 comment Reasoning Aptitude Thanks for prettifying the answer, Marvis. I'm awful with Latex :). May 22 revised Reasoning Aptitude added 12 characters in body May 22 answered Reasoning Aptitude Dec 6 revised Probability of being late edited body