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 x_15: ~Q_15(x_15). forall x_15: P_15(x_15) -> Q_15(x_15). t <-> P_15(j).
t -> P_15(j) can be inferred via the biconditional elimination rule. P_15(j) -> t can be inferred via the biconditional elimination rule. forall x_15: ~P_15(x_15) can be inferred via the universal modus tollens rule.