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On graphs related to conjugacy classes of groups

Identifieur interne : 000D58 ( Istex/Corpus ); précédent : 000D57; suivant : 000D59

On graphs related to conjugacy classes of groups

Auteurs : Guy Alfandary

Source :

RBID : ISTEX:A1FAA67F41C80130B50E1266E233CC566AB1D4B6

English descriptors

Abstract

Abstract: LetG be a finite group. Attach toG the following two graphs: Γ — its vertices are the non-central conjugacy classes ofG, and two vertices are connected if their sizes arenot coprime, and Γ* — its vertices are the prime divisors of sizes of conjugacy classes ofG, and two vertices are connected if they both divide the size of some conjugacy class ofG. We prove that whenever Γ* is connected then its diameter is at most 3, (this result was independently proved in [3], for solvable groups) and Γ* is disconnected if and only ifG is quasi-Frobenius with abelian kernel and complements. Using the method of that proof we give an alternative proof to Theorems in [1],[2],[6], namely that the diameter of Γ is also at most 3, whenever the graph is connected, and that Γ is disconnected if and only ifG is quasi-Frobenius with abelian kernel and complements. As a result we conclude that both Γ and Γ* have at most two connected components. In [2],[3] it is shown that the above bounds are best possible.

Url:
DOI: 10.1007/BF02773678

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ISTEX:A1FAA67F41C80130B50E1266E233CC566AB1D4B6

Le document en format XML

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<abstract lang="en">Abstract: LetG be a finite group. Attach toG the following two graphs: Γ — its vertices are the non-central conjugacy classes ofG, and two vertices are connected if their sizes arenot coprime, and Γ* — its vertices are the prime divisors of sizes of conjugacy classes ofG, and two vertices are connected if they both divide the size of some conjugacy class ofG. We prove that whenever Γ* is connected then its diameter is at most 3, (this result was independently proved in [3], for solvable groups) and Γ* is disconnected if and only ifG is quasi-Frobenius with abelian kernel and complements. Using the method of that proof we give an alternative proof to Theorems in [1],[2],[6], namely that the diameter of Γ is also at most 3, whenever the graph is connected, and that Γ is disconnected if and only ifG is quasi-Frobenius with abelian kernel and complements. As a result we conclude that both Γ and Γ* have at most two connected components. In [2],[3] it is shown that the above bounds are best possible.</abstract>
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<title>Israel Journal of Mathematics</title>
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<title>Israel J. Math.</title>
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<publisher>Springer</publisher>
<dateIssued encoding="w3cdtf">1994-10-01</dateIssued>
<copyrightDate encoding="w3cdtf">1994</copyrightDate>
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<genre>Journal-Subject-Group</genre>
<topic authority="SpringerSubjectCodes" authorityURI="M">Mathematics</topic>
<topic authority="SpringerSubjectCodes" authorityURI="M00009">Mathematics, general</topic>
<topic authority="SpringerSubjectCodes" authorityURI="M11000">Algebra</topic>
<topic authority="SpringerSubjectCodes" authorityURI="M11078">Group Theory and Generalizations</topic>
<topic authority="SpringerSubjectCodes" authorityURI="M12007">Analysis</topic>
<topic authority="SpringerSubjectCodes" authorityURI="M13003">Applications of Mathematics</topic>
<topic authority="SpringerSubjectCodes" authorityURI="P19005">Mathematical and Computational Physics</topic>
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<identifier type="ISSN">0021-2172</identifier>
<identifier type="eISSN">1565-8511</identifier>
<identifier type="JournalID">11856</identifier>
<identifier type="IssueArticleCount">18</identifier>
<identifier type="VolumeIssueCount">3</identifier>
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<date>1994</date>
<detail type="volume">
<number>86</number>
<caption>vol.</caption>
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<detail type="issue">
<number>1-3</number>
<caption>no.</caption>
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<extent unit="pages">
<start>211</start>
<end>220</end>
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<recordOrigin>Hebrew University, 1994</recordOrigin>
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<identifier type="DOI">10.1007/BF02773678</identifier>
<identifier type="ArticleID">BF02773678</identifier>
<identifier type="ArticleID">Art7</identifier>
<accessCondition type="use and reproduction" contentType="copyright">The Magnes Press, 1994</accessCondition>
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