Comment #6 on issue 2006 by [email protected]: Make all expressions
recursively callable
http://code.google.com/p/sympy/issues/detail?id=2006
Concerning diffgeom, indeed some stuff there relies on it, but go on,
remove this without addressing the test failures there and I will just send
a pull request to your branch with a workaround.
I am quite sure that nothing else depends on it.
I am not against the removal if you consider it a bad idea, however I think
that (x+1)(3) resulting in (x+1) is very sensible and well defined.
Generally, the current implementation does not have corner cases - it is a
very simple and in my opinion sensible rule.
P.S. It does not work for expressions like `f+g` where f takes one argument
and g takes two arguments, but the problem is with the nonsensical
expression, not with the current rules.
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