Exercise logic.propositional.consequence
Description
Prove that formula is a logical consequence of a set of formulas
Derivation
Final term is not finished
p <-> r, q <-> s => ((p /\ q /\ r) || ~(p /\ q)) /\ (s || ~(p /\ q)) /\ ((p /\ q /\ r /\ s) || ~(r /\ s))
⇒ logic.propositional.demorganand, initial=TList [TCon logic1.equivalent [TVar "p",TVar "r"],TCon logic1.equivalent [TVar "q",TVar "s"]]p <-> r, q <-> s => ((p /\ q /\ r) || ~p || ~q) /\ (s || ~(p /\ q)) /\ ((p /\ q /\ r /\ s) || ~(r /\ s))