Comment #14 on issue 1545 by [email protected]: Efficient data
representation in logic.satisfiable()
http://code.google.com/p/sympy/issues/detail?id=1545
This should be 'raise ValueError(...). I know, your patch does not
introduce this,
but I just spotted it. :)
I'll change it.
Would it make sense to use 'is' instead of '==' here for a slight
performance
improvement?
Yes, sure.
Why was this change necessary?
With the set implementation, the choice of the symbol for which to try both
alternatives has become "non-deterministic" so (almost) any model
satisfying the
clauses can be returned.
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