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: p_17 -> u. R_16(a_16) -> p_17. ~u. forall x_16: R_16(x_16) <-> S_16(x_16).
~p_17 can be inferred via the modus tollens rule. R_16(a_16) -> u can be inferred via the transitivity rule. forall x_16: R_16(x_16) -> S_16(x_16) can be inferred via the universal biconditional elimination rule. forall x_16: S_16(x_16) -> R_16(x_16) can be inferred via the universal biconditional elimination rule.