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: ~R_13(f). forall x_13: R_13(x_13) <-> S_13(x_13). p_1.
~R_13(f) and p_1 can be inferred via the conjunction rule. p_1 and ~R_13(f) can be inferred via the conjunction rule. forall x_13: R_13(x_13) -> S_13(x_13) can be inferred via the universal biconditional elimination rule. forall x_13: S_13(x_13) -> R_13(x_13) can be inferred via the universal biconditional elimination rule.