sympy/sympy — pull request #1935 by skirpichev (2013-03-25 21:59:16+00:00)
Title: Fix printing Manifold and Differential in diffgeom module

The blackboard bold font in the AMSFonts package only has capital letters. So, if we want to print small leters (e.g. "d" for the differential operator symbol), we shouldn't use \mathbb{d} (or "d" just disappear).

Also, print dimension of the manifold.