Tres addenda a Sistemas Normativos

The paper deals with three notions, which are crucial in the famous book Normative Systems by Carlos AlchouRRón and Eugenio Bulygin: 1) the concept of «complementary» concerning the consequent of a norm and the related concept of a partial gap; 2) the concept of a normative gap which, being a combinatory notion, does not allow one to grasp a wider concept of a normative gap, which is often found in doctrinal literature, and 3) the logical relations between universes of cases of different fineness or specificity, for what concerns the passage from finer universes to less fine universes. Regarding these three notions, the present paper proposes, respectively, to partially amend the first, to widen the second, and to reinterpret the third.