We construct an explicit infinite family of pairwise non-isomorphic infinite simple groups of type F infinity (in particular, they are finitely presented) that act faithfully on the circle by orientation-preserving homeomorphisms, but that admit neither non-trivial piecewise affine nor piecewise projective actions on the projective line. Our examples are certain forest-skein groups which, informally, are a mixture of Richard Thompson's groups with Vaughan Jones' planar algebras.

Finitely presented simple groups with no piecewise projective actions / Brothier, A.; Seelig, R.. - In: JOURNAL OF THE LONDON MATHEMATICAL SOCIETY. - ISSN 1469-7750. - 113:1(2026), pp. e70436.1-e70436.36. [10.1112/jlms.70436]

Finitely presented simple groups with no piecewise projective actions

Brothier A.;
2026-01-01

Abstract

We construct an explicit infinite family of pairwise non-isomorphic infinite simple groups of type F infinity (in particular, they are finitely presented) that act faithfully on the circle by orientation-preserving homeomorphisms, but that admit neither non-trivial piecewise affine nor piecewise projective actions on the projective line. Our examples are certain forest-skein groups which, informally, are a mixture of Richard Thompson's groups with Vaughan Jones' planar algebras.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3132098
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