On Hausdorff covers for non-Hausdorff groupoids

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• Julian Gonzales (University of Glasgow)
• Thursday 17 July 2025, 15:25-15:45
• External.

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TGAW02 - C*-algebras: classification and dynamical constructions

Non-Hausdorff étale groupoids arise naturally in many contexts, however, key tools used in the study of their Hausdorff counterparts are not always applicable. This talk looks at a Hausdorff cover introduced by Timmermann, and describes how it can be used to avoid certain technical difficulties encountered in the study of non-Hausdorff étale groupoids and their C*-algebras. In particular, the Hausdorff cover yields characterisations of amenability, as well as triviality of the singular ideal in certain cases. This is based on joint work with K. A. Brix, J. B. Hume and X. Li.

This talk is part of the Isaac Newton Institute Seminar Series series.

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