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Professor of Mathematics at Temple University.


2d
comment Koebe–Andreev–Thurston theorem - where can I find a proof?
Andreev's second paper (on polyhedra of finite volume, but also the Roeder/Hubbard fix to the error in Andreev's paper).
2d
comment Koebe–Andreev–Thurston theorem - where can I find a proof?
Rodin and Sullivan proved that circle packing maps converge to the Riemann mapping, NOT the circle packing theorem. The convergence of Thurston's algorithm was proved by Marden and Rodin, though Thurston's original observation (that circle packing follows from Andre'ev's theorem) is a two-line remark (but does not apply to higher genus).
2d
comment Koebe–Andreev–Thurston theorem - where can I find a proof?
Also, what is Andre'ev, chopped liver? Geez, talk about revisionism...
2d
comment Koebe–Andreev–Thurston theorem - where can I find a proof?
Bobenko and Springborn??? That argument is due to yours truly (annals, 1994), B&S give a dual version, which connects my argument with Colin de Verdiere's.
Nov
22
awarded  Popular Question
Nov
17
comment Reducible polynomials
@FelipeVoloch It works with probability 1 asymptotically in height and degree, but I assume the OP is actually interested in actual polynomials, and has some bounds on height and degree in mind (and the convergence to 1 is not that fast in either metric).
Nov
17
comment Reducible polynomials
It does not say anywhere that there is no better way (there might, in fact, be), but no one I have ever talked to knows of one (including van Hoeij, who is THE expert). You are welcome to try to come up with one :)
Nov
17
answered Reducible polynomials
Nov
14
answered On a proposition in Hartshorne's paper “Ample vector bundles on curves”
Nov
14
comment Polytopes with few vertices and few facets
@TimothyChow (2) and (3) is, of course, really only one condition :)
Nov
14
comment What is the expected dimension of the Zariski closure of the rational points on the moduli space of curves?
@JasonStarr My guess is that the OP has already asked Nick :)
Nov
7
comment Copositivity under tensor products
What does copositive mean?
Nov
7
answered An infinite product associated with random matrices
Nov
7
revised Expectation of exp(-1/(ax^2)) when x is a standard normal variable and a>0 is a parameter
fixed formula for proper normalization
Nov
6
answered Expectation of exp(-1/(ax^2)) when x is a standard normal variable and a>0 is a parameter
Nov
5
comment Is this infinite series related to some well-known special functions?
Not from Mathematica (I tried).
Nov
5
answered closed integral formula for a non-zero solution of a homogeneous linear ODE of order 2
Nov
5
comment Which mapping class group representations come from algebraic geometry?
Re: abelian not being essential - true, but far from easy, see (on arxiv) the recent paper of Larsen, Lubotzky, Malestein, Grunewald.
Nov
4
answered Which mapping class group representations come from algebraic geometry?
Nov
4
answered Examples of compact complex non-Kähler manifolds which satisfy $h^{p,q} = h^{q,p}$