Comment #42 on issue 821 by pr...@goodok.ru: multiple arguments for max and
other improvements
http://code.google.com/p/sympy/issues/detail?id=821
This
`(v.is_real is not None) or (v is S.Infinity) or (v is S.NegativeInfinity)`
raised Exception for `cos(x)`.
There is why I just updated raising condition as
`if (v.is_real == False) or (v is S.ComplexInfinity)`
And it pushed now.
Also I tried to substitute Matrices but apparently obtained some bugs:
>>> Max(zeros(2))
SympifyError: SympifyError: 'Matrix cannot be sympified'
>>> simplify(zeros(2))
AttributeError:
>>> zeros(2).simplify()
(ok)
>>> zeros(2) > 1
True
>>> zeros(2) < 1
False
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