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Apr
21
comment Disprove this Piece of Jensen's Inquality “Black Magic”
The convex set I'm referring to is the convex hull of the support of $X$.
Apr
21
comment Disprove this Piece of Jensen's Inquality “Black Magic”
Your inequalities hold over any convex subset of $\mathbb C$ that avoid the origin, but you can't really say much more, for the reason that Suvrit mentions.
Apr
9
revised Is the number of vertices bounded for fixed max degree and fixed diameter?
added 4 characters in body
Apr
9
answered Is the number of vertices bounded for fixed max degree and fixed diameter?
Mar
29
awarded  Good Question
Mar
12
comment What's the analogue of a Young symmetrizer in the Brauer algebra?
There is an explicit formula in Nazarov's 2002 ICM address arxiv.org/abs/math/0209129 or his previous paper with a similar title. His setting is slightly more general but it's not hard to specialize to the Brauer algebra.
Mar
10
awarded  Good Answer
Mar
9
comment A set of integers whose factorial can be written as a product of two factorials
Some equations of the form $k!=P(n)$ ca be solved, but the case $P(n)=n(n-1)$ is still out of reach, I believe. mathoverflow.net/questions/39210/…
Mar
3
awarded  polynomials
Mar
2
comment On a reciprocal of Ostrowski theorem on Newton polytopes and factorization
@Bruno, the stronger question has a negative answer, too. I added an example to the answer.
Mar
2
revised On a reciprocal of Ostrowski theorem on Newton polytopes and factorization
added 451 characters in body
Mar
2
answered On a reciprocal of Ostrowski theorem on Newton polytopes and factorization
Mar
2
awarded  Popular Question
Feb
28
awarded  Enlightened
Feb
28
awarded  Nice Answer
Feb
28
awarded  Nice Answer
Feb
23
revised A variant to the Hadwiger-Nelson problem
added 494 characters in body
Feb
23
answered A variant to the Hadwiger-Nelson problem
Feb
22
comment Fixed points of self maps
Do you want assumptions on the underlying field? Are you working over $\mathbb C$?
Feb
22
comment Square-free grows as $6n/\pi^2$: $k$-th free?
Yes, your guess of $1/\zeta(k)$ is correct :) en.wikipedia.org/wiki/…