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: exists x_7: P_7(x_7) <-> P_3(x_7). forall x_7: P_7(x_7) -> P_3(x_7).
exists x_7: P_7(x_7) -> P_3(x_7) can be inferred via the existential biconditional elimination rule. exists x_7: P_3(x_7) -> P_7(x_7) can be inferred via the existential biconditional elimination rule.