sympy/sympy — pull request #1993 by pernici (2013-04-09 17:03:14+00:00)
Title: nthroot of a sum of surds

added ``minimal_polynomial_sq`` and ``nthroot``

``minimal_polynomial_sq`` returns the minimal polynomial for the
``nth-root`` of a sum of surds.

``nthroot`` computes a real ``nth-root`` of a sum of surds.

modified ``minimal_polynomial`` to call ``minimal_polynomial_sq``;
solved issue 2895