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_15(a_12) -> w. forall x_15: P_15(x_15) <-> Q_15(x_15). w -> P_15(a_12).
Q_15(a_12) -> P_15(a_12) can be inferred via the transitivity rule. forall x_15: P_15(x_15) -> Q_15(x_15) can be inferred via the universal biconditional elimination rule. forall x_15: Q_15(x_15) -> P_15(x_15) can be inferred via the universal biconditional elimination rule.