2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74007The lambda-ring cohomology in dimensions 0 and 1 of certain truncated polynomial filtered lambda-rings are computed. The dimension 1 case is related to deformations of lambda-rings.Commutative AlgebraK-Theory and HomologyRings and Algebras13D15; 13D03; 13D10text