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(i) <-> T(i). forall x_3: P(x_3) <-> T(x_3). ~T(i).
P(i) -> T(i) can be inferred via the biconditional elimination rule. T(i) -> P(i) can be inferred via the biconditional elimination rule. forall x_3: P(x_3) -> T(x_3) can be inferred via the universal biconditional elimination rule. forall x_3: T(x_3) -> P(x_3) can be inferred via the universal biconditional elimination rule.