sympy/sympy — pull request #2380 by cheatiiit (2013-08-12 23:56:15+00:00)
Title: Merged: Cds & is_deriv

Merges the following branches:

-> is_deriv: https://github.com/sympy/sympy/pull/2191
-> cds : https://github.com/sympy/sympy/pull/2185