Comment #12 on issue 880 by asmeu...@gmail.com: Remove Matrix.__hash__
http://code.google.com/p/sympy/issues/detail?id=880
Right now, it breaks because some functions in the matrix expressions pass
mutable matrices on to Function.eval for things like adjoint, which is
cached. I think the solution is to not cache such things, but it's not so
easy. collections.Hashable is really stupid; isinstance(a,
collections.Hashable) works if a.__hash__ == None, but isinstance((a,),
collections.Hashable) doesn't. So I guess we just have to catch TypeError
in the cache.
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