Comment #3 on issue 986 by nicolas.pourcelot: -oo < oo is False
http://code.google.com/p/sympy/issues/detail?id=986
Comparisons involving infinities are very hazardous for now (sympy 0.6.4).
>>> -1.5 < -oo
True
I think this is really annoying, because it leads to frequent wrong results.
What's more, it doesn't seem so difficult to patch, *at least temporarily*.
Even if it's far from prefect, a naive patch like the following would
indeed resolve
most problems :
- for the Infinity class:
def __gt__(a, b):
if type(b) is Infinity:
return False
return True
def __lt__(a, b):
return False
def __ge__(a, b):
return True
def __le__(a, b):
if type(b) is Infinity:
return True
return False
- and for the NegativeInfinity class:
def __gt__(a, b):
return False
def __lt__(a, b):
if type(b) is NegativeInfinity:
return False
return True
def __ge__(a, b):
if type(b) is NegativeInfinity:
return True
return False
def __le__(a, b):
return True
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