Comment #21 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
Sigh...I even made a crib sheet for myself listing power and log rules. But
I made the mistake. I hoped to be encouraged that I got it right in
powdenest, but alas, no:
from sympy import *
var('x')
x
from sympy.simplify.simplify import powdenest
powdenest(sqrt(x**2))
x
You can remove the numerator from a rational power (x**2/3) =
(x**(1/3))**2; you can move a integer to join a "power already in progress"
(i.e. the reverse of the above) but you can't move a pure integer out to
join the fraction. I suppose powdenest could get the assume_all_pos hint...
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