2026-04-13T01:00:51Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/2035792024-12-20T08:42:15Zcom_2072_199267com_2072_4427col_2072_199862

2012-11-13T10:46:44Z urn:hdl:2072/203579 On spectral approximation, Folner sequences and crossed products Lledó, Fernando, 1967- In this article we review first some of the possibilities in which the notions of Fo lner sequences and quasidiagonality have been applied to spectral approximation problems. We construct then a canonical Fo lner sequence for the crossed product of a concrete C* -algebra and a discrete amenable group. We apply our results to the rotation algebra (which contains interesting operators like almost Mathieu operators or periodic magnetic Schrödinger operators on graphs) and the C* -algebra generated by bounded Jacobi operators. 2012-11-13T10:46:44Z 2024-09-19T13:32:38Z 2012-11-13T10:46:44Z 2024-09-19T13:32:38Z 2011 2011 info:eu-repo/semantics/preprint http://hdl.handle.net/2072/203579 eng Prepublicacions del Centre de Recerca Matemàtica;1059 info:eu-repo/semantics/openAccess L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Centre de Recerca Matemàtica RECERCAT (Dipòsit de la Recerca de Catalunya)