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: ~U(j_4). forall y: Q_4(y) -> U(y). q -> Q_4(j_4). forall y: U(y) -> Q_4(y).
forall y: Q_4(y) <-> U(y) can be inferred via the universal biconditional introduction rule. forall y: U(y) <-> Q_4(y) can be inferred via the universal biconditional introduction rule.