sympy/sympy — pull request #1139 by tesserahub (2012-03-18 23:56:46+00:00)
Title: Added power notation for conjugation and commutator function

http://en.wikipedia.org/wiki/Commutator

The power notation appears in a couple of group theory pages in Wikipedia, such as the 2nd example here: http://en.wikipedia.org/wiki/Group_action#Examples, and the commutator page above. It is also used in the CAS system GAP.

Also I added a test for conjugation, which was oddly missing from the combinatorics test suite...