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Christian Bönicke (Newcastle University)
Thursday 03 July 2025, 16:30-17:00
Amalgamated products of étale groupoids
⚠️ Important: TGAW01 - Crossed products and groupoid C*-algebras
- 👤 Speaker: Christian Bönicke (Newcastle University)
- 📅 Date & Time: Thursday 03 July 2025, 16:30 - 17:00
- 📍 Venue: External
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Abstract
Free products and amalgamated products are coproducts in the context of discrete groups. As exhibited by Bass-Serre theory, they play a central role in the structure theory of discrete groups and the geometric approach to group theory. In this talk I will explain how to generalise these constructions to the setting of étale groupoids by constructing the amalgamated product of two étale groupoids over a common subgroupoid. I will then discuss approximation properties and the reduced groupoid C*-algebra of an amalgamated product of groupoids. This is based on joint work in progress with Max Durrant.
Series This talk is part of the Isaac Newton Institute Seminar Series series.
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