Comment #44 on issue 93 by mario.pe...@gmail.com: Square root denesting
http://code.google.com/p/sympy/issues/detail?id=93
But as far as I understand, nsimplify() is just a numeric heuristic. It's
possible to get two expressions that are very close (closer than the
given precision), but not equal, but nsimplify() will think they are.
In the case of ``(a + b*sqrt(c))**Rational(1, n)`` with ``a,b,c,n`` integer
one can use ``nsimplify`` to get a candidate solution; then it is trivial
to check if it is correct.
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