Ben Alpert
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 Oct1 awarded Enlightened Sep16 comment Finding $\lim\limits_{n \to \infty} \sum\limits_{k=0}^n { n \choose k}^{-1}$ Why is the text on this so big? Aug19 awarded Good Answer Aug3 comment How to solve this exponential equation Besides, that's not a complete answer. x ≈ 1.37129 works as well. Jul30 comment Which average to use? (RMS vs. AM vs. GM vs. HM) Isaac: Thanks, fixed. Jul30 comment Which average to use? (RMS vs. AM vs. GM vs. HM) Qiaochu Yuan: Can you elaborate a little more? I'm not sure you mean by rotational invariance. How are you rotating the values? Jul30 accepted Which average to use? (RMS vs. AM vs. GM vs. HM) Jul30 revised Which average to use? (RMS vs. AM vs. GM vs. HM) edited body Jul30 comment Which average to use? (RMS vs. AM vs. GM vs. HM) (Couldn't decide whether or not this is appropriate for this site; vote to close at will.) Jul30 asked Which average to use? (RMS vs. AM vs. GM vs. HM) Jul30 comment Proof that $n^3+2n$ is divisible by 3 Indeed. If you do enough problems like this, then at least tricks like this become second nature. Jul30 revised Proof that $n^3+2n$ is divisible by 3 edited body Jul30 comment Counting how many hands of cards use all four suits This is a fantastic solution that I hadn't thought of. Thanks! Jul30 accepted Counting how many hands of cards use all four suits Jul30 comment Are the “proofs by contradiction” weaker than other proofs? Related: math.stackexchange.com/questions/198. Jul30 answered Proof that $n^3+2n$ is divisible by 3 Jul30 revised Proof that $n^3+2n$ is divisible by 3 added 357 characters in body Jul30 answered Proof that $n^3+2n$ is divisible by 3 Jul28 answered How do I convert from Cartesian to conical coordinates? Jul27 awarded Beta