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apr 2 at 19:02If $e^A$ and $e^B$ commute, do $A$ and $B$ commute?
mar 18 at 5:45Looking for an intuitive explanation why the row rank is equal to the column rank for a matrix
mar 14 at 0:22A problem on Condition $\det(A+B)=\det(A)+\det(B)$
mar 7 at 21:26What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
mar 5 at 16:37When will PageRank fail?
oct 22 '11 at 12:36Stuck trying to prove an inequality