2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125396The theme is the influence of the spin structure on the Dirac spectrum of a spin manifold. We survey examples and results related to this question.16 pages, 3 figures, to appear in the proceedings of the meeting ``Analyse Harmonique et Analyse sur les Varietes'', 31 May to 4 June 1999, CIRM, Luminy, FranceDifferential GeometrySpectral Theory58G25; 58G30text