sympy/sympy — pull request #2231 by thilinarmtb (2013-06-30 18:51:05+00:00)
Title: A bug in simplify fixed

Previously `simplify(Sum(i, (i, a, b))*Sum(i**2, (i, a, b)))` returned `Sum(i**2, (i, a, b))`.
A bug fix for the similar scenarios.