2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/210593In this note we use recent results concerning the sum theorem for maximal monotone multifunctions in general Banach spaces to find new characterizations and properties of regular maximal monotone multifunctions and then use these to describe the domain of certain enlargements.6 pagesFunctional Analysis47H05, 46N10, 42A50text