2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173092Spectral triples (of compact type) are constructed on arbitrary separable quasidiagonal C*-algebras. On the other hand an example of a spectral triple on a non-quasidiagonal algebra is presented.5 pages; the paper will appear in Expositiones Mathematicae. v2 corrects an erroneuous comment, no changes in the resultsOperator Algebras46L87 (Primary), 47A66 (Secondary)text