Comment #26 on issue 821 by Vinzent.Steinberg: multiple arguments for max
and other improvements
http://code.google.com/p/sympy/issues/detail?id=821
Max(x, 1) will assume it is real
IMHO it should rather assume it could be real. So a lazily evaluated Max()
is the way to go in this case.
Max(x, 1).subs(x, I)
should raise an exception, because we can be sure that it is not comparable.
I believe that at least in classic analysis the real set is a superset of
any comparable set, so checking for 'is_real' might be sane.
Please note that for a complex input we have by default 'is_real == None'.
So an exception could only be raised for 'is_real == False'.
Maybe we need some 'is_comparable' assumption to allow more flexibility? Or
is this overkill?
About remove_duplicates(): Python 2.4 has sets, so I believe your code is
still compatible. I'll verify this.
Now for something different: What do you think about Max.args being a
frozenset instead of a tuple?
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