2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60003Concerns decompositions of smooth 4-manifolds as the union of two handlebodies, each with handles of index <=2 (``Heegard'' decompositions).Sample result: Two 2-complexes are (up to 2-deformation) dual spines of a Heegard decomposition of the 4-sphere if and only if they satisfy the conclusions of the Alexander-Lefshetz duality theorem ($H_1K\simeq H^2L$ and $H_2K\simeq H^1L$).19 pages, AMSTeX soruce fileGeometric TopologyAlgebraic Topology57R65, 57M99text