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: exists y: S_4(y) <-> T_3(y). forall y: T_3(y) -> P(y).
exists y: S_4(y) -> T_3(y) can be inferred via the existential biconditional elimination rule. exists y: T_3(y) -> S_4(y) can be inferred via the existential biconditional elimination rule.