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bio website math.temple.edu/~rivin
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Professor of Mathematics at Temple University.


8h
comment Riemann Mapping Theorem
Precomposing with $z \rightarrow 1/z$ reduces it to the standard Riemann Mapping Theorem.
1d
answered Geodesic paths on a flat sphere
1d
comment Mean of a vector
Chapter V should work. (you have to be a little careful, since your linear transformations are not invertible, but semigroups are fine). Note that picking the triples randomly will both slow you down (when you pick three equal coordinates) and prevent you from jamming, as in @Henry's example).
1d
answered Mean of a vector
2d
comment How can I express the following integral as special function?
Why do you believe that such an expression is possible? It is not too hard to get an infinite sum of Bessel functions...
Dec
21
comment Can a positive measure subset of a free group be nowhere dense?
@HJRW Sorry, I am quite dense: how so?
Dec
21
comment Can a positive measure subset of a free group be nowhere dense?
@HRJW how is this dense in $\mathbb{Z}?$ It has natural density $0,$ so does not contain any arithmetic progression...
Dec
21
answered Can a positive measure subset of a free group be nowhere dense?
Dec
21
answered Is there any elementary proof of No wandering domain for polynomials
Dec
21
answered Do geodesics in SL2R map to geodesics in the hyperbolic plane?
Dec
19
answered How many k-subsets of the integers {1,…,n} sum to N?
Dec
19
answered Nonperiodic points of homeomorphisms of a ball
Dec
17
comment Gaussian Elimination for Orthogonal groups
What exactly do you want to accomplish by this?
Dec
17
answered Hypergeometric function 2F1 convexity proof:
Dec
14
answered Dilatation of surface diffeomorphisms
Dec
14
comment Measuring the Randomness and Statistics of Convex Polygons
For example, one can generate random points on the circle...
Dec
8
answered Why do Pell equations appear in Ramanujan's pi formulas?
Dec
8
comment What kind of complex surfaces are analogous to rotation surfaces?
Rotation surface = surface of revolution?
Dec
7
answered Proving a random bipartite graph contains a perfect matching
Dec
3
answered Generalization of Pascal's Theorem to Higher Dimensions