Comment #7 on issue 4075 by [email protected]: More efficient to_cnf
http://code.google.com/p/sympy/issues/detail?id=4075

Is it a bad idea for satisfiable() to always recurse across an Or (even ones that are easy to flatten)? It seems to me like the analogue of solve() always recursing across a Mul. One disadvantage I can think of is that you will no longer be guaranteed to get a full model, as DPLL2 seems to do. Could it ever be far less efficient than converting to CNF first and running the normal solver, as it currently does?

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