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 Apr 17 asked Testing whether the circumcenter of a cyclic quadrilateral lies inside it Apr 17 awarded Nice Question Apr 16 awarded Yearling Apr 16 revised Closed form for the area of a convex cyclic n-gon, given the set of edge lengths added 51 characters in body Apr 16 asked Closed form for the area of a convex cyclic n-gon, given the set of edge lengths Feb 26 revised Average time for a tetris field to fill deleted 71 characters in body Feb 18 comment A function which determines whether a function is odd, even or none, functional? @gniourf_gniourf I have a follow up question, how does this work with self-referencing functions? E.g. if I call the functional above $E$, a function $T$ maps (0, -1, 1) to (0, 0, 1), then where does this go wrong? $f(x) = x^{T(E(f))}$ Dec 8 comment Finding solution to matrix equation over GF(2) with minimal true variables This question is equivalent to this question on theoretical computer science. It is NP-complete through a reduction to the minimal-weight code problem. Dec 5 asked Finding solution to matrix equation over GF(2) with minimal true variables Nov 28 answered Prove that $\alpha=\beta=\gamma$ Nov 28 revised Maximal tiling without any 3-in-a-rows added 287 characters in body Nov 27 revised Maximal tiling without any 3-in-a-rows added 254 characters in body Nov 27 answered Maximal tiling without any 3-in-a-rows May 10 suggested rejected edit on Dividing an angle into $n$ equal parts May 10 comment Dividing an angle into $n$ equal parts My answer was incorrect (and trivially so - it implied you can trisect an angle). Oops. May 4 comment Example of uncomputable but definable number Could you elaborate what qualifies as a 'really really simple' for the algorithm of $f$? Apr 29 accepted Is there a fast divisibility check for a fixed divisor? Apr 27 awarded Self-Learner Apr 25 revised Is there a fast divisibility check for a fixed divisor? added 3 characters in body Apr 25 revised Is there a fast divisibility check for a fixed divisor? edited body