Comment #3 on issue 4114 by [email protected]: ImmutableMatrix.is_zero is
always False
http://code.google.com/p/sympy/issues/detail?id=4114
Ah, I see, that's unfortunate. The old assumptions (system in which
Basic.is_zero participates) is indeed magical. Fortunately old assumptions
is slated for removal. Unfortunately it has been in this state for several
years and will likely continue to exist for a long while.
Moving a large chunk of old assumptions from Basic to Expr might not be as
hard as removing it entirely and would isolate this problem away from
matrices.
Another approach is to ask about the use of `is_zero` within matrices.
Maybe this should be treated as non-sensical and we should really have an
`is_zero_matrix` or just use `__nonzero__`.
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