2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/141772We give a survey of results relating the restricted holonomy of a Riemannian spin manifold with lower bounds on the spectrum of its Dirac operator, giving a new proof of a result originally due to Kirchberg.19 pages, To appear in International Mathematical Forum (2008)Differential Geometrytext