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 Jun24 comment Are “$n$ by $n$ matrices with rank $k$” an affine algebraic variety? Nice one, thanks! Jun24 accepted Are “$n$ by $n$ matrices with rank $k$” an affine algebraic variety? Jun24 asked Are “$n$ by $n$ matrices with rank $k$” an affine algebraic variety? Jun15 awarded Altruist Jun12 comment Are cyclic groups always abelian? Sounds good. And in fact, having this picture is great because it shows that each row (or column) is the previous row (or column) shifted by 1. What's more is that if we associate $e,a,b$ with $g^0, g^1, g^2$, then we can see the "addition table" structure come out. Jun12 comment Are cyclic groups always abelian? This is a valid example, but giving a single example doesn't explain why we'd expect cyclic groups to be abelian in general. Jun12 awarded Critic Jun10 comment Contemporary Mathematical Columns in Magazines I know these aren't columns, but do resources like TopCoder or Project Euler qualify? Jun10 answered Fun Linear Algebra Problems Jun10 awarded Organizer Jun10 comment How can I calculate the standard deviation knowing an event probability and a number of trials? Good question! I hope it's okay that I removed the "probability-theory" tag. Jun10 revised How can I calculate the standard deviation knowing an event probability and a number of trials? edited tags Jun10 awarded Quorum Jun10 comment Help with understanding and studying probability And of course, posting such questions on this site would be helpful :) Jun10 answered Help with understanding and studying probability Jun10 comment Largest Part of a Random Weak Composition That's a cool insight; if you actually use this approximation, what can you say about the error (especially when $n$ is small)? Jun10 awarded Investor Jun8 awarded Nice Answer Jun7 revised Cyclic groups whose every non-identity member is a generator added 44 characters in body; deleted 4 characters in body; added 1 characters in body Jun7 answered Cyclic groups whose every non-identity member is a generator