Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1634 by jorn.baayen: Cannot compare NumberSymbols like pi and E
http://code.google.com/p/sympy/issues/detail?id=1634
In [124]: pi < 0
Out[124]: False
In [125]: pi > 0
Out[125]: -π < 0
This is because class NumberSymbol implements '<' such that
def __gt__(self, other):
return (-self) < (-other)
reducing the above issue to the problem where Add and Mul don't
implement comparison:
In [126]: x=Symbol('x',is_real=True)
In [127]: x+2<x+3
Out[127]: 2 + x < 3 + x (should be: True)
In [128]: (-1)*x<(-1)*x
Out[128]: -x < -x (should be: False)
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