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 Apr 17 awarded Yearling May 16 awarded Good Answer Apr 17 awarded Yearling Apr 17 awarded Yearling Apr 17 awarded Yearling Feb 27 awarded Nice Answer Dec 14 comment How to find perpendicular vector to another vector? There are many possible notation, I choose to use the same notation of the question, but other choice are good as well. $i$,$j$,$k$ refers to vectors $(1,0,0)$, $(0,1,0)$ and $(0,0,1)$, so it is basically the same thing after you do vector-scalar multiplication. Dec 6 answered pigeonhole problem understanding a step Dec 6 revised Maximize $x_1x_2+x_2x_3+\cdots+x_nx_1$ deleted 6 characters in body Dec 6 revised Maximize $x_1x_2+x_2x_3+\cdots+x_nx_1$ added 1 characters in body Dec 6 revised Maximize $x_1x_2+x_2x_3+\cdots+x_nx_1$ deleted 79 characters in body Dec 6 answered Maximize $x_1x_2+x_2x_3+\cdots+x_nx_1$ Dec 3 answered Given a set of digits, what is the biggest number we can make using exponentiation - numberphile noodle quiz Dec 3 comment Game theory problem: Poker with bluffing Yes, should be solvable even in this case, but you must remove strategy with the same payoff. For example "RC,RC,RC" dominates "RC,RC,RD" (and the opposite too), because you can always play the one of them instead of the other and get a greater or equal pay-off. Note that you can have some rounding errors in the code that lead to a fail of equality check, I suggest multiplying each payoff by 9, so you can work with integer. Dec 1 answered Shortest path between two points that stays away from its rotated images Nov 30 revised Men on a boat problem added 243 characters in body Nov 30 revised Men on a boat problem added 60 characters in body Nov 30 comment Men on a boat problem And from there a closed formula can be easily found... Nov 30 answered Men on a boat problem Nov 30 answered Symmetry of Solution to Classical 3-Dimensional Isoperimetric Problem