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 Nov 21 comment The Light beam Problem. Consider $N=2$. Oct 28 answered Not so obvious probability puzzle. Oct 25 comment Game for mathematicians about differentiation of polynomials and subtractions in their coefficients. In general, it seems that you want to be player 1 when there are an odd number of positive coefficients remaining. Let's say P1 eliminates a coefficient (differentiating can only eliminate $a_0$). If all remaining coefficients (an even number) are 1, then P1 wins. Otherwise, the next sequence of moves (under optimal play) is the game of nim where the coefficients converge to all 1's. Sep 22 answered Probability of rolling a dice 8 times before all numbers are shown. Dec 18 awarded Caucus Oct 28 answered Trace Minimization of Covariance Matrix Apr 27 awarded Yearling Apr 15 awarded Revival Feb 6 accepted Number-Theoretic Coin Puzzle Feb 5 revised Number-Theoretic Coin Puzzle deleted 14 characters in body Feb 5 comment Number-Theoretic Coin Puzzle @MarcvanLeeuwen Done, thanks. Feb 5 revised Number-Theoretic Coin Puzzle deleted 14 characters in body Feb 5 revised Number-Theoretic Coin Puzzle edited tags Feb 5 comment Number-Theoretic Coin Puzzle @MarcvanLeeuwen Yes, I put that there to avoid consideration of the trivial case. Feb 5 comment Number-Theoretic Coin Puzzle @KonstantinosGaitanas Yes, you may move coins from any pile $x$ to any other pile $y$, but only such that the number of coins in $y$ is doubled. Feb 5 asked Number-Theoretic Coin Puzzle May 6 awarded Caucus Apr 27 awarded Yearling Mar 9 accepted Can the Basel problem be solved by Leibniz today? Mar 9 comment Can the Basel problem be solved by Leibniz today? This is a great answer! Quite $(\heartsuit)$ly.