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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.
Forum Mathematicum – de Gruyter
Published: May 1, 2019
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