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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 $a^2+b^2+c^2\geq [2(a-b)^2(b-c)^2(a-c)^2]^{1/3}$
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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