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_3(y) <-> T_4(y). exists y: T_4(y) <-> W(y). forall y: ~W(y).
forall y: T_3(y) -> T_4(y) can be inferred via the universal biconditional elimination rule. exists y: T_4(y) -> W(y) can be inferred via the existential biconditional elimination rule. forall y: T_4(y) -> T_3(y) can be inferred via the universal biconditional elimination rule. exists y: W(y) -> T_4(y) can be inferred via the existential biconditional elimination rule. exists y: ~T_4(y) can be inferred via the existential biconditional elimination rule.