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Dec
12
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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Dec
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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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Nov
16
comment Functions over $R$ such that $f(xy) = f(x)f(y)$
Oh yes, I forgot all about the fact that $(xy)^n = x^n y^n$. So I guess the answer to the first question is "yes", but my second question remains.
Nov
15
asked Functions over $R$ such that $f(xy) = f(x)f(y)$