Exercise logic.propositional.consequence
Description
Prove that formula is a logical consequence of a set of formulas
Derivation
~p -> ~q, q => p
⇒ conj-intro, initial=TList [TCon logic1.implies [TCon logic1.not [TVar "p"],TCon logic1.not [TVar "q"]],TVar "q"](~p -> ~q) /\ q => p
⇒ logic.propositional.defimpl(~~p || ~q) /\ q => p
⇒ logic.propositional.notnot(p || ~q) /\ q => p
⇒ fakeabsorptionp /\ q => p
⇒ conj-elimp => p