9 Nov
2017
9 Nov
'17
10:58 a.m.
I read that in the Denver airport, but my sleep deprived brain couldn't process it. On Thu, Nov 9, 2017 at 9:22 AM, Tom Duff <td@pixar.com> wrote:
I got this from Dan Piponi (@sigfpe on twitter):
sum (a+b)^-2 (c+d)^-2 (a+b+c+d)^-2 = 1/24
where the sum is over all integers (a,b,c,d) with 1<=a<=b, 1<=c<=d
Paper: Tropical formulae for summation over a part of SL(2, Z) Nikita Kalinin, Mikhail Shkolnikov https://arxiv.org/abs/1711.02089
-- Tom Duff. Branches broken off trees.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun