Finitely presented simple torsion-free groups in the landscape of Richard Thompson

arxiv(2023)

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摘要
We construct the first (to our knowledge) examples of finitely presented (infinite) simple groups of homeomorphisms of R. Our examples also satisfy the stronger finiteness property type $\mathbf{F}_{\infty}$: they are fundamental groups of connected aspherical CW complexes with finitely many cells in each dimension. To our knowledge, ours is the only family of finitely presented simple torsion-free groups that has been constructed since the Burger-Mozes construction from [8]. Besides admitting faithful actions on the line by homeomorphisms, the groups in our family satisfy the following fundamentally new features. They have infinite geometric (and cohomological) dimension, and they admit a nontrivial homogeneous quasimorphism (and hence have infinite commutator width).
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