44,330 reputation
659141
bio website math.temple.edu/~rivin
location USA
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visits member for 4 years, 5 months
seen 5 hours ago

Professor of Mathematics at Temple University. Regius Professor of Mathematics at St Andrews starting Fall 2015.


9h
comment Defining relations of mapping class group for genus 2 closed surface
@Xiao-GangWen true, I was careless in reading. For $g=2$ use the Birman-Hilden (really Bergau-Mennike) presentation instead of Wajnryb's, as now stated.
9h
revised Defining relations of mapping class group for genus 2 closed surface
fixed argument.
10h
answered Defining relations of mapping class group for genus 2 closed surface
1d
answered Positive rational numbers as sum of unit fractions
1d
comment complexity of eigenvalue decomposition
@Suvrit yes, Robert does answer my question...
2d
answered Are there examples of functions in $L_1$ and $L_\infty$ whose Fourier series divergent (“weakly”)?
2d
answered hyperbolic structure on Figure–8 knot complement
2d
comment complexity of eigenvalue decomposition
@Suvrit is there some reason the unitary eigenvalue problem is not easier than the the general case?
May
17
awarded  Enlightened
May
17
answered Question about the Weeks Manifold
May
17
comment how to evaluate the following double summation to infinity without using integration method?
@NoamD.Elkies Yes, indeed Mathematica is happy to evaluate it, but it would be interesting if there were a closed form (of course, it depends on what you mean by "closed").
May
17
awarded  Nice Answer
May
17
comment how to evaluate the following double summation to infinity without using integration method?
@WillSawin agreed on both points. I fixed the first, not the second, since it still doesn't actually give any sort of closed form for the sum.
May
16
revised how to evaluate the following double summation to infinity without using integration method?
fixed bug pointed out by Will.
May
16
revised how to evaluate the following double summation to infinity without using integration method?
fixed tex bug
May
16
answered how to evaluate the following double summation to infinity without using integration method?
May
16
awarded  Enlightened
May
16
awarded  Nice Answer
May
14
answered Magnus' embedding theorem
May
13
answered Connection between the two definitions of Siegel Upper Half Space