Comment #17 on issue 2009 by torstenm...@googlemail.com: Document why solve((x-y,y),x) is None
http://code.google.com/p/sympy/issues/detail?id=2009
Sorry, for the "silverstone". It was a greeting from the T9 on my cell phone.
An iterable for multiple variables would use the ordering given the solve call. Or to be more precise, the symbols argument of the solve call. When no symbols are given the order would not be defined.
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