Comment #19 on issue 2039 by smichr: Mul.eval_subs problems http://code.google.com/p/sympy/issues/detail?id=2039
(I looked at the page but don't see where f denotes a square root...do you get that from the Cayley Table page where f**2 = d so f = sqrt(d)?)
Regarding the power rules, you didn't break any power rules in the example you gave. You can always pull the integer to the outside, e.g. sqrt((-1)**2) = (-1)**(2/2) = -1.
And I have done as you say: assume it exists and apply normal power rules. I believe it is all working in the version that I have pushed to github.
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