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_2: Q(y_2) <-> P(y_2). ~p_4. p_4 or Q(a_16).
Q(a_16) can be inferred via the disjunctive syllogism rule. R_1(a_16) -> p_4 can be inferred via the rewriting rule. forall y_2: Q(y_2) -> P(y_2) can be inferred via the universal biconditional elimination rule. forall y_2: P(y_2) -> Q(y_2) can be inferred via the universal biconditional elimination rule.