Until today I thought, if solve returns a nonempty dict, then there is a
(complete) solution to the provided system.


However this is apparently not the case:

>>> solve([y, x], x)
{x:0}


Moreover, this behavior seems not to be consistent


>>> solve([x, y], y)
[]


(results from SymPy 0.7.4.1 on live.sympy.org)


Am I on a wrong track or is that a bug?

Best regards,
Carsten

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