Comment #5 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
What is described in comment #4 is what I would also expect. I am currently working on the patch for documenting the actual behavior but would vote for #4 behavior as it feels more natural to me (I have not used Maple or Mathematica so far). If Maple a reference for SymPy, this should be documented or for the case it is already documented at a more prominent place.
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