Updates:
        Status: Accepted
        Owner: pr...@goodok.ru
        Labels: Core

Comment #1 on issue 2983 by pr...@goodok.ru: Max(a,1)*Max(a,2) or Min(a,1)*Min(a,2) raises exception
http://code.google.com/p/sympy/issues/detail?id=2983


This exception raising when two similar terms (which arguments are sets) are trying to be sorted in `mul.flatten`.

E.g. the same exception is for `Or`, `And' functions:

    >>> Or(y, x) * Or(x, z)
    TypeError: cannot compare sets using cmp()

    >>> And(y, x) * And(x, z)
    TypeError: cannot compare sets using cmp()


(although I am not sure of sense of those multiplications)

I started with it.

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