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: ~Q(a_7). forall y_4: P(y_4) <-> Q(y_4). P(a_7) or p.
forall y_4: P(y_4) -> Q(y_4) can be inferred via the universal biconditional elimination rule. forall y_4: Q(y_4) -> P(y_4) can be inferred via the universal biconditional elimination rule.