sympy/sympy — pull request #1707 by zanzibar7 (2012-12-31 20:38:27+00:00)
Title: derivatives of Max() and Min() using Heaviside()

modified: sympy/functions/elementary/miscellaneous.py
modified: sympy/functions/elementary/tests/test_miscellaneous.py

* added fdiff for Min() and Max()
* added diff Min() and Max()
* implement simple tests of Max().diff and Min().diff