2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/168452A combinatorial proof of the Gordon Conjecture: The sum of two Heegaard splittings is stabilized if and only if one of the two summands is stabilized.23 pages, 17 figures. Revised version incorporates Ruifeng Qiu as coauthorGeometric Topology57M27text