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_20: ~P_20(x_20). s or u. forall x_20: P_20(x_20) or T(x_20). ~s.
u can be inferred via the disjunctive syllogism rule. forall x_20: T(x_20) can be inferred via the universal disjunctive syllogism rule.