Comment #6 on issue 1878 by jensen.oyvind: For non-commutative symbols all
comparisons evaluate to False
http://code.google.com/p/sympy/issues/detail?id=1878
Is that really an issue?
I came to the conclusion that (a-b).is_negative tests for membership among
the
negative real numbers. I would not expect an expression that is
noncommutative
w.r.t. the standard multiplication operator to be a number at all, rather a
Matrix or
some other object. For what would you need non-commutative multiplication
of numbers?
Øyvind
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