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: T(z_1) -> W_2(z_1). W_2(i_1) <-> q_3.
W_2(i_1) -> q_3 can be inferred via the biconditional elimination rule. q_3 -> W_2(i_1) can be inferred via the biconditional elimination rule.