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_10: R(x_10) -> S_10(x_10). ~u. S_10(a) <-> u.
S_10(a) -> u can be inferred via the biconditional elimination rule. u -> S_10(a) can be inferred via the biconditional elimination rule. ~S_10(a) can be inferred via the biconditional elimination rule.