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: w_1 -> ~Q_1(a). w_1 <-> w_2. forall x: Q_1(x).
w_1 -> w_2 can be inferred via the biconditional elimination rule. w_2 -> w_1 can be inferred via the biconditional elimination rule.