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Group theory

Thompson's group F is nonamenable

OpenAI research collection · 1 manuscript · Source checked 2026-10-19

OpenAI's result summary

Proves that Thompson's group F, the group of dyadic piecewise linear homeomorphisms of the interval, is nonamenable, resolving its longstanding amenability problem.

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MANUSCRIPT 01

Thompson's group F is nonamenable

We prove that Thompson's group F is nonamenable. This confirms Geoghegan's conjecture and resolves the amenability problem for F.

This PDF is listed in OpenAI's formalization catalogue. See the scope and dependencies before interpreting coverage.

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