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_1: Q(z_1) <-> S(z_1). r -> S(i). r or Q(i).
R_1(i) -> r can be inferred via the rewriting rule. forall z_1: Q(z_1) -> S(z_1) can be inferred via the universal biconditional elimination rule. forall z_1: S(z_1) -> Q(z_1) can be inferred via the universal biconditional elimination rule.