# Opposite algebras of groupoid C*-algebras

@article{Buss2017OppositeAO,
title={Opposite algebras of groupoid C*-algebras},
author={Alcides Buss and Aidan Sims},
journal={Israel Journal of Mathematics},
year={2017},
volume={244},
pages={759 - 774}
}
• Published 14 August 2017
• Mathematics
• Israel Journal of Mathematics
We show that every groupoid C*-algebra is isomorphic to its opposite, and deduce that there exist C*-algebras that are not stably isomorphic to groupoid C*-algebras, though many of them are stably isomorphic to twisted groupoid C*-algebras. We also prove that the opposite algebra of a section algebra of a Fell bundle over a groupoid is isomorphic to the section algebra of a natural opposite bundle.
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