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Open subgroups of the automorphism group of a right-angled building

(2019) GEOMETRIAE DEDICATA. 203(1). p.1-23
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Abstract
We study the group of type-preserving automorphisms of a right-angled building, in particular when the building is locally finite. Our aim is to characterize the proper open subgroups as the finite index closed subgroups of the stabilizers of proper residues. One of the main tools is the new notion of firm elements in a right-angled Coxeter group, which are those elements for which the final letter in each reduced representation is the same. We also introduce the related notions of firmness for arbitrary elements of such a Coxeter group and n-flexibility of chambers in a right-angled building. These notions and their properties are used to determine the set of chambers fixed by the fixator of a ball. Our main result is obtained by combining these facts with ideas by Pierre-Emmanuel Caprace and Timothee Marquis in the context of Kac-Moody groups over finite fields, where we had to replace the notion of root groups by a new notion of root wing groups.
Keywords
Right-angled buildings, Right-angled Coxeter groups, Totally disconnected locally compact groups, open subgroups, COCOMPACT LATTICES

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Citation

Please use this url to cite or link to this publication:

MLA
De Medts, Tom, and Ana Filipa Costa da Silva. “Open Subgroups of the Automorphism Group of a Right-Angled Building.” GEOMETRIAE DEDICATA, vol. 203, no. 1, 2019, pp. 1–23.
APA
De Medts, T., & Costa da Silva, A. F. (2019). Open subgroups of the automorphism group of a right-angled building. GEOMETRIAE DEDICATA, 203(1), 1–23.
Chicago author-date
De Medts, Tom, and Ana Filipa Costa da Silva. 2019. “Open Subgroups of the Automorphism Group of a Right-Angled Building.” GEOMETRIAE DEDICATA 203 (1): 1–23.
Chicago author-date (all authors)
De Medts, Tom, and Ana Filipa Costa da Silva. 2019. “Open Subgroups of the Automorphism Group of a Right-Angled Building.” GEOMETRIAE DEDICATA 203 (1): 1–23.
Vancouver
1.
De Medts T, Costa da Silva AF. Open subgroups of the automorphism group of a right-angled building. GEOMETRIAE DEDICATA. 2019;203(1):1–23.
IEEE
[1]
T. De Medts and A. F. Costa da Silva, “Open subgroups of the automorphism group of a right-angled building,” GEOMETRIAE DEDICATA, vol. 203, no. 1, pp. 1–23, 2019.
@article{8616794,
  abstract     = {{We study the group of type-preserving automorphisms of a right-angled building, in particular when the building is locally finite. Our aim is to characterize the proper open subgroups as the finite index closed subgroups of the stabilizers of proper residues. One of the main tools is the new notion of firm elements in a right-angled Coxeter group, which are those elements for which the final letter in each reduced representation is the same. We also introduce the related notions of firmness for arbitrary elements of such a Coxeter group and n-flexibility of chambers in a right-angled building. These notions and their properties are used to determine the set of chambers fixed by the fixator of a ball. Our main result is obtained by combining these facts with ideas by Pierre-Emmanuel Caprace and Timothee Marquis in the context of Kac-Moody groups over finite fields, where we had to replace the notion of root groups by a new notion of root wing groups.}},
  author       = {{De Medts, Tom and Costa da Silva, Ana Filipa}},
  issn         = {{0046-5755}},
  journal      = {{GEOMETRIAE DEDICATA}},
  keywords     = {{Right-angled buildings,Right-angled Coxeter groups,Totally disconnected locally compact groups,open subgroups,COCOMPACT LATTICES}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{1--23}},
  title        = {{Open subgroups of the automorphism group of a right-angled building}},
  url          = {{http://dx.doi.org/10.1007/s10711-019-00423-7}},
  volume       = {{203}},
  year         = {{2019}},
}

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