2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/66128The rational cohomology of a coadjoint orbit ${\cal O}$ is expressed as tensor product of the cohomology of other coadjoint orbits ${\cal O}_k$, with $ \hbox{dim} {\cal O}_k< \hbox{dim} {\cal O}$.Minor revision. Version to appear in Archiv der MathematikSymplectic Geometrytext