Comment #5 on issue 4030 by [email protected]: Sympy hangs on fairly
simple expression
http://code.google.com/p/sympy/issues/detail?id=4030
This is an interesting use-case for my work at
https://github.com/sympy/sympy/pull/2508. One could make
`ask(Q.positive(sign(y)) | Q.negative(sign(y))` work in that branch (one
would additionally need to assume `~Q.zero(y)`, which I'm guessing the
series code implicitly does anyway), and with a bit more work, make
`ask(Eq(sign(y)*oo, oo) | Eq(sign(y)*oo, -oo))` work as well. It's a lot of
work, though, but it's what I'd like to see.
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