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Characterizing Groupoid C*-Algebras of Non-Hausdorff Étale Groupoids (en Inglés)
Ruy Exel
(Autor)
·
David R. Pitts
(Autor)
·
Springer
· Tapa Blanda
Characterizing Groupoid C*-Algebras of Non-Hausdorff Étale Groupoids (en Inglés) - Exel, Ruy ; Pitts, David R.
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Reseña del libro "Characterizing Groupoid C*-Algebras of Non-Hausdorff Étale Groupoids (en Inglés)"
This book develops tools to handle C*-algebras arising as completions of convolution algebras of sections of line bundles over possibly non-Hausdorff groupoids. A fundamental result of Gelfand describes commutative C*-algebras as continuous functions on locally compact Hausdorff spaces. Kumjian, and later Renault, showed that Gelfand's result can be extended to include non-commutative C*-algebras containing a commutative C*-algebra. In their setting, the C*-algebras in question may be described as the completion of convolution algebras of functions on twisted Hausdorff groupoids with respect to a certain norm. However, there are many natural settings in which the Kumjian-Renault theory does not apply, in part because the groupoids which arise are not Hausdorff. In fact, non-Hausdorff groupoids have been a source of surprising counterexamples and technical difficulties for decades. Including numerous illustrative examples, this book extends the Kumjian-Renault theory toa much broader class of C*-algebras. This work will be of interest to researchers and graduate students in the area of groupoid C*-algebras, the interface between dynamical systems and C*-algebras, and related fields.
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