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 y_4: R(y_4) <-> P(y_4). P(a_7).
exists x: P(x) can be inferred via the existential generalization rule. forall y_4: R(y_4) -> P(y_4) can be inferred via the universal biconditional elimination rule. forall y_4: P(y_4) -> R(y_4) can be inferred via the universal biconditional elimination rule.