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: T_4(x_15) -> P_15(x_15). w -> P_15(f). ~T_4(f). forall x_15: P_15(x_15) <-> T_4(x_15).
forall x_15: P_15(x_15) -> T_4(x_15) can be inferred via the universal biconditional elimination rule. forall x_15: T_4(x_15) -> P_15(x_15) can be inferred via the universal biconditional elimination rule.