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arXiv · 2110.09445

On Kumjian's C*-diagonals and the opaque ideal

Ruy Exel
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Abstract

We characterize exotic C*-algebras of twisted, principal \'etale groupoids, together with the abelian subalgebra associated to the unit space, as precisely being the inclusions "$A\subseteq B$" of C*-algebras in which $A$ is abelian, regular, and satisfies the extension property (pure states extend uniquely to $B$). When $B$ is moreover nuclear, we deduce that the corresponding opaque ideal is trivial. As an application, we give a streamlined characterization of Kumjian's C*-diagonals as the regular abelian subalgebras satisfying the extension property with vanishing opaque ideal.

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Ruy Exel. 2021-10-18. On Kumjian's C*-diagonals and the opaque ideal. https://arxiv.org/abs/2110.09445

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