2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73874For a symplectic manifold $(M,ω)$, not necessarily hard Lefschetz, we prove a version of the Merkulov $dδ$--lemma. We also study the $dδ$--lemma and related cohomologies for compact symplectic solvmanifolds.18 pages, no figuresSymplectic GeometryDifferential Geometry53D35; 57R17The $dδ$--lemma for weakly Lefschetz symplectic manifoldstext