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: q <-> p_4. forall x_11: P_11(x_11). ~p_4.
q -> p_4 can be inferred via the biconditional elimination rule. p_4 -> q can be inferred via the biconditional elimination rule. ~q can be inferred via the biconditional elimination rule.