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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Mathematische Annale...arrow_drop_down
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Mathematische Annalen
Article . 1970 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
zbMATH Open
Article . 1970
Data sources: zbMATH Open
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On local connectedness of locally compact Abelian groups

Authors: FAN, K.;

On local connectedness of locally compact Abelian groups

Abstract

A well-known characterization of the local connectedness of a compact Abelian group in terms of a dual property is the following theorem of Pontryagin ([4], § 38, Theorem 48): The dual group G of a discrete Abelian group G is locally connected, if and only if every finite set in G is contained in a finitely generated subgroup H of G with torsion-free G/H. Combining this theorem with a result of Braconnier ([1], p. 19), Dixmier ([2], p. 38) derived that a locally compact Abelian group is locally connected if and only if it is a product of the form R" x E x/) , where R" is a vector group with n __> 0, E is a discrete Abelian group, and D is a discrete, torsion-free Abelian group in which every subgroup of finite rank is free. The purpose of the present note is to prove the following result which is another natural extension of Pontryagin's theorem to arbitrary locally compact Abelian groups.

Country
Germany
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Keywords

510.mathematics, group theory, Article

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
6
Average
Average
Average
Green