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visits member for 3 years, 9 months
seen Apr 9 at 6:28

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comment What's the explanation for why n^2+1 is never divisible by 3?
I like the first three paragraphs, although I'd start the first with "For any integer $n$,". Why not conclude with "Thus, for any value of $n$, either $n^2$ or $n^2 - 1$ is a multiple of three, so the next multiple of three above $n^2$ is either $n^2+2$ or $n^2+3$."?
Dec
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comment Are there any interesting semigroups that aren't monoids?
Although this answers the question in the title, it seems to ignore the second paragraph where I try to tighten what is meant by the question.
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comment Why is the volume of a cone one third of the volume of a cylinder?
Yes, it's not clear what the "so forth" means -- what is the fourth dimensional counterpart?
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