Ma Ming
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 Oct 30 reviewed Approve Change of variables for stochastic integral Sep 19 awarded Yearling Apr 30 answered Trigonometric inequality in an obtuse triangle Apr 29 awarded Nice Answer Apr 29 answered Prove that $n^2(n^2+1)(n^2-1)$ is a multiple of $5$ for any integer $n$. Apr 28 revised Prove that $a^2+b^2+c^2\geq [2(a-b)^2(b-c)^2(a-c)^2]^{1/3}$ added 7 characters in body Apr 28 revised Prove that $a^2+b^2+c^2\geq [2(a-b)^2(b-c)^2(a-c)^2]^{1/3}$ added 86 characters in body Apr 28 revised Prove that $a^2+b^2+c^2\geq [2(a-b)^2(b-c)^2(a-c)^2]^{1/3}$ added 86 characters in body Apr 28 answered Prove that $a^2+b^2+c^2\geq [2(a-b)^2(b-c)^2(a-c)^2]^{1/3}$ Apr 26 reviewed Approve If $A$ is positive definite then so is $A^k$ Apr 9 accepted Compute the expectation of steps making $n$ different balls the same Apr 8 awarded Nice Question Apr 3 comment Compute the expectation of steps making $n$ different balls the same Your comment are very helpful. Thanks a lot. I guess now I get it. Apr 2 comment Compute the expectation of steps making $n$ different balls the same ma.huji.ac.il/hart/papers/n-colors.pdf Apr 1 comment Compute the expectation of steps making $n$ different balls the same It seems not true for $n=4$, never mind. Apr 1 comment Compute the expectation of steps making $n$ different balls the same I conjecture that $E_{1^n}=E_{1^{n-1}}+E_{1^{n-1}2}$. It is not hard to solve $E_{1^{n-1}2}$. Naively, we first make the first $n-1$ balls the same color then the rest is $E_{1^{n-1}2}$. Apr 1 revised A Fourier Analysis Question I am stuck at added 86 characters in body Apr 1 answered A Fourier Analysis Question I am stuck at Apr 1 revised Compute the expectation of steps making $n$ different balls the same added 4 characters in body Apr 1 revised Compute the expectation of steps making $n$ different balls the same deleted 1 character in body