2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/71087In this paper we extend the results of \cite{Plumbing} to calculate Ozsváth-Szabó Floer homology group HF+ for a class of negative-semidefinite plumbings with b_1 = 1.15 pages, 2 figuresSymplectic GeometryOn Heegaard Floer homology of plumbed three-manifolds with b_1=1text