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. ~S_1(g). forall x: S_1(x) <-> U_4(x).
p and ~S_1(g) can be inferred via the conjunction rule. ~S_1(g) and p can be inferred via the conjunction rule. forall x: S_1(x) -> U_4(x) can be inferred via the universal biconditional elimination rule. forall x: U_4(x) -> S_1(x) can be inferred via the universal biconditional elimination rule.