Exercise logic.propositional.consequence
Description
Prove that formula is a logical consequence of a set of formulas
Firsts
Rule logic.propositional.notnot Location [1,0] Term "Just (TList [TList [TCon logic1.and [TCon logic1.or [TVar \"p\",TVar \"q\"],TCon logic1.or [TVar \"p\",TVar \"r\"]]],TCon logic1.or [TVar \"p\",TVar \"r\"]])" Focus "Just (TVar \"p\")" Environment