Updates:
Labels: NeedsReview smichr
Comment #6 on issue 3653 by [email protected]: solve does not return zero
roots when solving a system of equation
http://code.google.com/p/sympy/issues/detail?id=3653
_invert was being applied to polynomials. Now,
assert solve([a**2 + a, a - b], [a, b]) == [(-1, -1), (0, 0)]
assert solve([a**2 + a*c, a - b], [a, b]) == [(0, 0), (-c, -c)]
https://github.com/sympy/sympy/pull/1813
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