Exercise

Exercise logic.propositional.consequence

Description
Prove that formula is a logical consequence of a set of formulas

(p <-> r) /\ (q <-> s) => ((p -> q) /\ (r -> s)) || (~(p -> q) /\ ~(r -> s))

ready: no

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initial=TList [TCon logic1.equivalent [TVar "p",TVar "r"],TCon logic1.equivalent [TVar "q",TVar "s"]]

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