2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/152229We consider the Dirac operator on compact quaternionic Kaehler manifolds and prove a lower bound for the spectrum. This estimate is sharp since it is the first eigenvalue of the Dirac operator on the quaternionic projective space.22 pages, LaTeX2e, fullpage styleDifferential Geometrytext