solve() for unsolveable system returns a nonempty dict

[Carsten Knoll]

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

[Julien Rioux]

If x and/or y is defined as symbols with nonzero=True, then this is a bug. Please open an issue at https://github.com/sympy/sympy/issues?state=open

Thanks,
cheers,
Julien

[Aaron Meurer]

The output type of solve is not very consistent. I recommend always using dict=True with solve. 

Aaron Meurer

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