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 x_14: P_14(x_14). p_4 <-> P_14(b).
p_4 -> P_14(b) can be inferred via the biconditional elimination rule. P_14(b) -> p_4 can be inferred via the biconditional elimination rule.