Comment #6 on issue 1168 by [email protected]: 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
subs(oo, 100) doesn't substitute all the infinities. Why is that so ? If it would have worked, we could have such an iszerofunc that replaces all symbols by some arbitrary numbers and then checks for zero.
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