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 Nov 29 answered Why this function is continuous and not differentiable at point $x=1$ Aug 16 awarded Commentator Jun 26 answered Are there fewer positive integers than all integers? Jan 1 accepted What do you call a function with the property $f(-x)=-f(x)$? Jan 1 comment What do you call a function with the property $f(-x)=-f(x)$? Oh, you mean the part where it says "This includes additive groups, all rings, all fields, and all vector spaces", ok Jan 1 comment What do you call a function with the property $f(-x)=-f(x)$? The article says "let f(x) be a real-valued function of a real variable", is it ok to extend it to the sets I mentioned (or whatever context where "-x" makes sense)? Jan 1 comment What do you call a function with the property $f(-x)=-f(x)$? Why the Japanese wikipedia? :) Jan 1 asked What do you call a function with the property $f(-x)=-f(x)$? Nov 28 awarded Yearling Nov 20 accepted How many iterations does it take to cover a range with random values? Nov 20 comment How many iterations does it take to cover a range with random values? Ah, the harmonic series, of course Nov 20 asked How many iterations does it take to cover a range with random values? Feb 22 revised Why are braid numbers of the form $Q_h^2$ or $2 \times Q_h^2$? Removed repeated text Feb 22 suggested approved edit on Why are braid numbers of the form $Q_h^2$ or $2 \times Q_h^2$? Jan 8 comment Why are braid numbers of the form $Q_h^2$ or $2 \times Q_h^2$? I think your statement is incomplete. Let's say the colors are A and B (e.g. amber and blue) and h=2. Initial piles are (top to bottom) A1, A2 and B1, B2. Then the new piles (bottom to top) A2, B1 and B2, A1 match your conditions but can not be obtained using the original rules. The reason is that there is a cycle formed by cards in the same new pile and consecutive cards of the same color: A2 -(pile)-> B1 -(color)-> B2 -(pile)-> A1 -(color)-> A2 Dec 7 comment Maximize $x_1x_2+x_2x_3+\cdots+x_nx_1$ It may be long, but it's fairly easy to follow, and seems correct :) Dec 7 awarded Editor Dec 7 revised Maximize $x_1x_2+x_2x_3+\cdots+x_nx_1$ improved spelling, grammar, formatting and corrected some mistakes Dec 7 awarded Scholar Dec 7 awarded Supporter