sympy/sympy — pull request #1158 by jrioux (2012-03-21 17:20:57+00:00)
Title: Implement (anti-)Hermitian assumption for symbols (issue 3151).

>>> A = Symbol('A', hermitian=True)
>>> B = Symbol('B', antihermitian=True)
>>> conjugate(A)
A
>>> conjugate(B)
-B
>>> conjugate(A*B)
-A*B
>>> conjugate(B*B)
B**2

http://code.google.com/p/sympy/issues/detail?id=3151