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Two-Generator Discrete Subgroups of Tree Automorphism Groups
Geometry/Topology| Speaker: | Yukun Du, University of Georgia |
| Related Webpage: | https://benniedu.github.io/ |
| Location: | 2112 MSB |
| Start time: | Tue, Sep 29 2026, 2:10PM |
Description
I will discuss the classification of discrete two-generator groups acting on locally finite trees. Under a small-geometry condition, the possible groups and quotient graphs are strongly constrained and can be classified explicitly. I will then explain how the picture becomes much richer beyond this regime, including higher-index amalgams and families with arbitrarily complicated quotient geometry.