The relative commutant of separable C*-algebras of real rank zero

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170843We answer a question of E. Kirchberg (personal communication): does the relative commutant of a separable C*-algebra in its ultrapower depend on the choice of the ultrafilter?To appear in Journal of Functional AnalysisOperator AlgebrasLogic46L05, 03E50The relative commutant of separable C*-algebras of real rank zerotext