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: ~R(y). forall y: R(y) <-> Q(y). forall y: Q(y) -> R(y).
forall y: ~Q(y) can be inferred via the universal modus tollens rule. forall y: R(y) -> Q(y) can be inferred via the universal biconditional elimination rule. forall y: Q(y) -> R(y) can be inferred via the universal biconditional elimination rule. forall y: ~Q(y) can be inferred via the universal biconditional elimination rule.