2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/119497A new construction for the form sum of positive, selfadjoint operators is given in this paper. The situation is a bit more general, because our aim is to add positive, symmetric operators. With the help of the used method, some commutation properties of the form sum extension are observed.14 pagesFunctional Analysis47A20, 47B25text