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Hurkyl earned this badge 3 times
feb 24 at 14:28Find a real function, $f$, s.t. $f(f(x)) = -x$.
jan 24 at 1:49Find all polynomials $P$ such that $P(x^2+1)=P(x)^2+1$
aug 14 at 22:55Are all infinities equal?