Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2988 by smi...@gmail.com: invalid expansion of Mul bases in Pow
http://code.google.com/p/sympy/issues/detail?id=2988
There is still a problem with invalid expansion of bases lurking in the
core:
(-2*x*y**y)**3.2
(-2)**3.2*x**3.2*(y**y)**3.2
_.subs({x:-1,y:2}).n()
239.811674986167 + 738.064444127351*I
(-2*x*y**y).subs({x:-1,y:2}).n()**3.2
776.046882053324
The handling in mul/_eval_power should not treat the e.is_Float case
differently than the e.is_Rational case. The result should look like this:
(-2*x*y**y)**3.2
2**3.2*(-x*y**y)**3.2
_.subs({x:-1,y:2}).n()
776.046882053324
(-2*x*y**y).subs({x:-1,y:2}).n()**3.2
776.046882053324
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