Título:
Solvable groups and affine actions on the line.
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Autor:
Brum, Joaquín
Matte Bon, Nicolás
Rivas, Cristóbal
Triestino, Michele
Matte Bon, Nicolás
Rivas, Cristóbal
Triestino, Michele
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Tipo de documento:
Preprint
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Palabras clave:
Group actions on the real line
Solvable groups
Actions on real trees
C1 actions
Solvable groups
Actions on real trees
C1 actions
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Año de publicación:
2024
Contenido:
Resumen:
We prove a structural result for orientation-preserving actions of finitely generated solvable groups on real intervals, considered up to semi-conjugacy. As applications we obtain new answers to a problem first considered by J. F. Plante, which asks under which conditions an action of a solvable group on a real interval is semi-conjugate to an action on the line by affine transformations. We show that this is always the case for actions by C1 diffeomorphisms on closed intervals. For arbitrary actions by homeomorphisms, for which this result is no longer true (as shown by Plante), we show that a semi-conjugacy to an affine action still exists in a local sense, at the level of germs near the endpoints. Finally for a vast class of solvable groups, including all solvable linear groups, we show that the family of affine actions on the line is robust, in the sense that any action by homeomorphisms on the line which is sufficiently close to an affine action must be semi-conjugate to an affine action. This robustness fails for general solvable groups, as illustrated by a counterexample.
Descripción:
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arXiv
EN:
Mathematics. Group Theory (math.GR), arXiv:2209.00091v2, sep. 2024, pp. 1-39.
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Citación:
Brum, J., Matte Bon, N., Rivas, C. y otros. Solvable groups and affine actions on the line. [Preprint]. Publicado en: Mathematics. Group Theory (math.GR), 2024, pp 1-39. arXiv:2209.00091v2. DOI: 10.48550/arXiv.2209.00091.
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Licencia Creative Commons Atribución (CC - By 4.0)
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| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| BMRT24.pdf | Preprint | 832.52 KB | Adobe PDF |