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: s -> r_3. forall x: P(x) -> T(x). ~t. t <-> r_3. P(g_4).
~t and P(g_4) can be inferred via the conjunction rule. P(g_4) and ~t can be inferred via the conjunction rule. t -> r_3 can be inferred via the biconditional elimination rule. r_3 -> t can be inferred via the biconditional elimination rule. ~r_3 can be inferred via the biconditional elimination rule. exists x: P(x) can be inferred via the existential generalization rule.