Hi,

I posted about this on GitHub but haven't gotten much of a response. Right 
now there are two seemingly mathematically equivalent notions of positive 
and negative infinity on the real line: 

-The singleton sympy.core.numbers.Infinity, also known as "oo"
-Float("inf"), also known as "+inf"

When trying to compare one of these to the other, we get inconsistent 
results, e.g.

-oo < -inf

will be left unevaluated but

-inf > -oo

returns False.

I guess both of these should be False. However, we also have

oo == x is False, but
x == oo is True.

Which of these is correct? Both of them?

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