2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59557The fundamental 2-form of an invariant almost Hermitian structure on a 6-dimensional Lie group is described in terms of an action by SO(4)xU(1) on complex projective 3-space. This leads to a combinatorial description of the classes of almost Hermitian structures on the Iwasawa and other nilmanifolds.22 pages, 2 figuresDifferential Geometry53C15; 53C55, 51A05, 17B30text