Comment #7 on issue 4009 by srjoglek...@gmail.com: Incorrect behaviour in
simplify when used with And and Equality
http://code.google.com/p/sympy/issues/detail?id=4009
Yup. Predicates aren't handled well in sympy.logic for now. And fixing this
would mean fixing simplify_logic only, since simplify calls simplify_logic
for all logic-related stuff.
One ad-hoc fix would be to use
e = Symbol('e')
simplify_logic(And(e, c)).subs({e : Equality(a, 2)})
And(a == 2, c)
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