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Article
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American Journal of Mathematics
Article . 1935 . Peer-reviewed
Data sources: Crossref
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The Structure of a Compact Connected Group

The structure of a compact connected group
Authors: van Kampen, E. R.;

The Structure of a Compact Connected Group

Abstract

Es sei \(F\) ein kompakter und zusammenhängender Gruppenraum, \(S(k)\) für \(k=1, 2, 3, \ldots\) alle seine (lokal) einfachen (kompakten) Lieschen Normalteiler, \(\overline{S(k)}\) die einfache Gruppe, deren Zentrum nur die Gruppeneins enthält, und die im kleinen isomorph mit \(S(k)\) ist, \(S(k)^*\) die einfach zusammenhängende, mit \(S(k)\) im kleinen isomorphe Gruppe \(S\), die von den \(S(k)\) erzeugte Untergruppe von \(F\), \(C\) das Zentrum von \(F\), \(A\) das von \(S\) und \(K\) die Komponente der Gruppeneins in \(C\). Dann ist \(A\) der Durchschnitt von \(C\) und \(S\), null-dimensional und \(F/A\) ist einstufig isomorph dem direkten Produkt von \(C/A\) und den \(\overline{S(k)}\). Insbesondere ist also \(F\) direktes Produkt einfacher Liescher Gruppen, wenn sein Zentrum nur die Gruppeneins enthält. \(F\) ist dann und nur dann im kleinen zusammenhängend, wenn \(C/A\) es ist. Ist \(D\) das direkte Produkt der \(S(k)^*\) mit \(K\), so existiert ein bis auf Automorphismen von \(D\) eindeutig bestimmter Normalteiler \(B\) von \(D\), der mit \(K\) nur die Gruppeneins gemein hat, so daß \(F\) und \(D/B\) einstufig isomorph sind. Diese Resultate werden gewonnen, indem der Satz von Pontrjagin [vgl. \textit{L. Pontrjagin}, C. R. Acad. Sci., Paris 198, 238--240 (1934; Zbl 0008.24603)], daß jede die Gruppeneins enthaltende offene Teilmenge von \(F\) einen abgeschlossenen Normalteiler \(H\) mit Lieschem \(F/H\) enthält, auf ein vollständiges Umgebungssystem der Gruppeneins angewandt wird.

Keywords

compact connected group, Compact groups

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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!
5
Average
Top 10%
Average
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