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 x_4: Q(x_4) <-> T(x_4). p_3 <-> T(b). Q(b) or p_3.
p_3 -> T(b) can be inferred via the biconditional elimination rule. T(b) -> p_3 can be inferred via the biconditional elimination rule. forall x_4: Q(x_4) -> T(x_4) can be inferred via the universal biconditional elimination rule. forall x_4: T(x_4) -> Q(x_4) can be inferred via the universal biconditional elimination rule.