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Apr
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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).
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revised Proof that $n^3+2n$ is divisible by 3
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revised Balance chemical equations without trial and error?
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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.
Dec
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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.