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: w. ~S_22(e_1). forall x_22: R_22(x_22) <-> S_22(x_22).
w and ~S_22(e_1) can be inferred via the conjunction rule. ~S_22(e_1) and w can be inferred via the conjunction rule. forall x_22: R_22(x_22) -> S_22(x_22) can be inferred via the universal biconditional elimination rule. forall x_22: S_22(x_22) -> R_22(x_22) can be inferred via the universal biconditional elimination rule.