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: Richard is a nurse or David is not sleeping. It is windy. For all x, if x goes running, then x is sleeping. Richard is not a nurse.
David is not sleeping can be inferred via the disjunctive syllogism rule. It is windy and Richard is not a nurse can be inferred via the conjunction rule. Richard is not a nurse and it is windy can be inferred via the conjunction rule. If David sleeps, then Richard is a nurse can be inferred via the rewriting rule.