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 y: T_1(y) -> P_1(y). exists y: T_1(y). forall y: U(y).
exists y: P_1(y) can be inferred via the existential modus ponens rule. exists y: T_1(y) and U(y) can be inferred via the existential conjunction rule. exists y: U(y) and T_1(y) can be inferred via the existential conjunction rule.