Comment #5 on issue 1168 by asmeurer: Matrix([[x+y, -x, 0], [-x-y, x, 1], [0,1,0]]).inf() gives wrong result
http://code.google.com/p/sympy/issues/detail?id=1168
simplify() can slow things down quite a bit, so we do not call it by default, even in methods like rref() where the correctness can depend on it.
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