Since such a transformation is not generally valid, it is disallowed (e.g.
if a = -1 then your expression would give 1 while the "simplified" version
would give -1). The transformation *is* valid if 'a' is positive, so you
can either create a with a positive assumption
>>> a = Symbol('a', positive=True)
>>> (a**2)**.5
a
or let posify handle the conversion:
>>> eq
(a**2)**0.5
>>> posify(eq)
(_a**1.0, {_a: a})
>>> p, r = posify(eq); p.subs(r)
a
Chris
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