What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall z: Q_1(z) <-> W(z). t -> W(b). Q_1(b) or t.
forall z: Q_1(z) -> W(z) can be inferred via the universal biconditional elimination rule. forall z: W(z) -> Q_1(z) can be inferred via the universal biconditional elimination rule.