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_7: P_7(x_7) or ~P(x_7). u or P(a_5). u -> P_7(a_5).
R_1(a_5) -> u can be inferred via the rewriting rule. forall x_7: P(x_7) -> P_7(x_7) can be inferred via the universal rewriting rule.