Ben Alpert
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 Apr10 comment How can you prove that the square root of two is irrational? If $p = 2^k m$ where $m$ is odd, then $p^2 = 2^{2k} m^2$ (where $m^2$ is still odd). Feb17 awarded Nice Answer Jan20 awarded Notable Question Nov15 revised Proof that $n^3+2n$ is divisible by 3 edited body Nov9 revised Balance chemical equations without trial and error? added 27 characters in body Sep30 awarded Explainer Jul20 awarded Yearling Jul2 awarded Curious Jan24 awarded Popular Question Sep16 awarded Popular Question Aug30 awarded Nice Answer Jul20 awarded Yearling May27 awarded Guru May8 awarded Caucus Mar23 awarded Nice Answer Mar5 awarded Nice Question Feb4 awarded Popular Question Dec17 awarded Popular Question Dec2 comment Kleene Closure and determining whether a string x is in a set @BrianM.Scott Oops, my bad. I somehow missed the first paragraph and only read the third. Dec2 comment Kleene Closure and determining whether a string x is in a set For the first set, you could also use a parity argument on the length of the string.