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Homomorphisms into totally disconnected, locally compact groups with dense image

Homomorphisms into totally disconnected, locally compact groups with dense image AbstractLet ϕ:G→H{\phi:G\rightarrow H}be a group homomorphism such that H is a totally disconnected locally compact (t.d.l.c.) group and the image of ϕ is dense. We show that all such homomorphisms arise as completions of G with respect to uniformities of a particular kind. Moreover, H is determined up to a compact normal subgroup by the pair (G,ϕ-1⁢(L)){(G,\phi^{-1}(L))}, where L is a compact open subgroup of H. These results generalize the well-known properties of profinite completions to the locally compact setting. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Forum Mathematicum de Gruyter

Homomorphisms into totally disconnected, locally compact groups with dense image

Forum Mathematicum , Volume 31 (3): 17 – May 1, 2019

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References (18)

Publisher
de Gruyter
Copyright
© 2019 Walter de Gruyter GmbH, Berlin/Boston
ISSN
0933-7741
eISSN
1435-5337
DOI
10.1515/forum-2018-0017
Publisher site
See Article on Publisher Site

Abstract

AbstractLet ϕ:G→H{\phi:G\rightarrow H}be a group homomorphism such that H is a totally disconnected locally compact (t.d.l.c.) group and the image of ϕ is dense. We show that all such homomorphisms arise as completions of G with respect to uniformities of a particular kind. Moreover, H is determined up to a compact normal subgroup by the pair (G,ϕ-1⁢(L)){(G,\phi^{-1}(L))}, where L is a compact open subgroup of H. These results generalize the well-known properties of profinite completions to the locally compact setting.

Journal

Forum Mathematicumde Gruyter

Published: May 1, 2019

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