A note on spectral triples and quasidiagonality

Abstract

Spectral 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 results