On Wed, Jul 25, 2012 at 5:48 PM, Alexander P-sky <apovolot at gmail.com> wrote: > Integrate[DedekindEta[x I], {x, 0, Infinity}] - > sum(3^m/m/binomial(2*m,m),m=1..infinity) > you can use WorkingPrecision to have better approximations next time with NIntegrate and Mathematica.