Comment #15 on issue 1309 by [email protected]: implement backward  
chaining for rules
http://code.google.com/p/sympy/issues/detail?id=1309

This is implemented in the new logic system (logic.inference.satisfiable)  
along with
other algorithms, etc.

http://groups.google.com/group/sympy-patches/browse_thread/thread/e56ceda0038b7c23

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