Comment #4 on issue 4030 by avichal....@gmail.com: Sympy hangs on fairly
simple expression
http://code.google.com/p/sympy/issues/detail?id=4030
I tried a simpler example such as series(x**y, x) and that also gives
O(log(x)**6)
In exponential.py a condition checks if arg0 belongs in [-oo, oo]. However
value of arg0 is oo*sign(y). Now since it does not know if sign(y) is +1 or
-1, it evaluates the conditions as false.
However it is clear that oo*sign(y) is either -oo or oo.
Should a separate function be made to check if a given expression is in
indeterminate form?
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