Comment #2 on issue 3109 by [email protected]: sqrt(exp(4*a)) != exp(2*a) http://code.google.com/p/sympy/issues/detail?id=3109
https://github.com/sympy/sympy/pull/1105 has changes which modify power rules. Tom might want to take a look since there are exp_polar related changes; and it would be helpful if someone can prove that the experimentally determined criteria `abs(e) < S.Pi/log(b)` is sufficient to ensure that `(b**e)**a` == `b**(e*a)` when e is not real. I've done some experimenting on my own and think it is right for b real or imaginary.
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