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dc.contributor.authorEfimov, Konstantin S.en
dc.contributor.authorMakhnev, Alexander A.en
dc.date.accessioned2021-01-28T10:47:57Z-
dc.date.available2021-01-28T10:47:57Z-
dc.date.issued2020-
dc.identifier.citationEfimov K. S. Distance-Regular Graph with Intersection Array {27, 20, 7; 1, 4, 21} Does not Exist / Konstantin S. Efimov, Alexander A. Makhnev. — DOI 10.15826/umj.2020.2.006. — Text : electronic // Ural Mathematical Journal. — 2020. — Volume 6. — № 2. — С. 63-67.en
dc.identifier.issn2414-3952-
dc.identifier.urihttp://elar.urfu.ru/handle/10995/95302-
dc.description.abstractIn the class of distance-regular graphs of diameter 3 there are 5 intersection arrays of graphs with at most 28 vertices and noninteger eigenvalue. These arrays are {18,14,5;1,2,14}, {18,15,9;1,1,10}, {21,16,10;1,2,12}, {24,21,3;1,3,18}, and {27,20,7;1,4,21}. Automorphisms of graphs with intersection arrays {18,15,9;1,1,10} and {24,21,3;1,3,18} were found earlier by A.A. Makhnev and D.V. Paduchikh. In this paper, it is proved that a graph with the intersection array {27,20,7;1,4,21} does not exist.en
dc.description.sponsorshipThis work was supported by RFBR and NSFC (project No.20-51-53013).en
dc.format.mimetypeapplication/pdfen
dc.language.isoenen
dc.publisherN.N. Krasovskii Institute of Mathematics and Mechanics of the Ural Branch of Russian Academy of Sciencesen
dc.publisherUral Federal University named after the first President of Russia B.N. Yeltsinen
dc.relation.ispartofUral Mathematical Journal. 2020. Volume 6. № 2en
dc.rightsCreative Commons Attribution Licenseen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/-
dc.subjectDISTANCE-REGULAR GRAPHen
dc.subjectGRAPH Γ WITH STRONGLY REGULAR GRAPH Γ3en
dc.subjectAUTOMORPHISMen
dc.titleDistance-Regular Graph with Intersection Array {27, 20, 7; 1, 4, 21} Does not Existen
dc.typeArticleen
dc.typeinfo:eu-repo/semantics/articleen
dc.typeinfo:eu-repo/semantics/publishedVersionen
dc.identifier.doi10.15826/umj.2020.2.006-
local.description.firstpage63-
local.description.lastpage67-
local.issue2-
local.volume6-
local.fund.rffi20-51-53013-
Располагается в коллекциях:Ural Mathematical Journal

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