Comment #31 on issue 821 by Vinzent.Steinberg: multiple arguments for max
and other improvements
http://code.google.com/p/sympy/issues/detail?id=821
in general case objects must be comparable with ones, and not with others.
You are right, it should not be tied to the objects, but to the <-relation.
However, is_comparable makes sense for objects which are not comparable in
any common sense, not even with objects of the same set. So by default, we
could return None, but things like 'I' False.
Probably we should use new-style assumptions anyway.
I'm afraid that `list` doesn't work with `sets` properly there.
It seems to work here and all tests pass in my branch using Python 2.4.
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