regular derivative in latex, fix latex derivative bug
partial versus ordinary derivative in mathml
pretty-print partial derivative symbol
more sophisticated logic for deciding whether to use a partial derivative
incorporate github pull request feedback
incorporate suggestions from github pull request
check that no exceptions are thrown in the case of differentiation with respect to an integer
better use of booleans in assert
fix unhandled case
fix for python 2.5 compatibility
Merge pull request #1931 from hacman/hacman

bugfix, consistency fix