2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72524We use a spanning tree model to prove a result of E. S. Lee on the support of Khovanov homology of alternating knots.13 pages, 3 figures; Footnote 1 was changed, a remark was rephrased as a theorem, a reference was added, typos were correctedGeometric TopologyQuantum Algebratext