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_10: P_10(x_10). forall x_10: P_10(x_10) -> P(x_10). P_1(a_1).
exists x: P_1(x) can be inferred via the existential generalization rule. forall x_10: P(x_10) can be inferred via the universal modus ponens rule.