Comment #3 on issue 2052 by asmeurer: is_number needs a new name
(was "is_number could do more")
http://code.google.com/p/sympy/issues/detail?id=2052
Make is_number stupid and quick.
For smarter operation, call it is_constant(*vars), which applies diff(expr,
*vars).is_zero (and thus we just have one algorithm, is_zero, which is as
smart as possible, since a lot of problems are reducible to
zero-equavelence).
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