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Vladikavkazskii Matematicheskii Zhurnal, 2016, Volume 18, Number 3, Pages 35–42 (Mi vmj588)  

This article is cited in 3 scientific papers (total in 3 papers)

Extensions of pseudogeometric graphs for $pG_{s-5}(s,t)$

A. K. Gutnovaa, A. A. Makhnevb

a North Ossetian State University after Kosta Levanovich Khetagurov, Vladikavkaz, Russia
b Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia
Full-text PDF (215 kB) Citations (3)
References:
Abstract: J. Koolen posed the problem of studying distance-regular graphs in which neighborhoods of vertices are strongly regular graphs with the second eigenvalue $\leq t$ for a given positive integer $t$. This problem is reduced to the description of distance-regular graphs in which neighborhoods of vertices are strongly regular graphs with non-principal eigenvalue $t$ for $t=1,2,\dots$ In the article by A. K. Gutnova and A. A. Makhnev "Extensions of pseudogeometrical graphs for $pG_{s-4}(s,t)$" the Koolen problem was solved for $t=4$ and for pseudogeometrical neighborhoods of vertices. In the article of A. A. Makhnev “Strongly regular graphs with nonprincipal eigenvalue 5 and its extensions” the Koolen problem for $t=5$ was reduced to the case where the neighborhoods of vertices are exceptional graphs. In this paper intersection arrays for distance-regular graphs whose local subgraphs are exceptional pseudogeometric graphs for $pG_{s-5}(s,t)$.
Key words: distance-regular graph, pseudogeometric graph, eigenvalue of graph.
Funding agency Grant number
Russian Science Foundation 15-11-10025
Ministry of Education and Science of the Russian Federation 02.A03.21.0006
Received: 18.02.2016
Document Type: Article
UDC: 519.17
Language: Russian
Citation: A. K. Gutnova, A. A. Makhnev, “Extensions of pseudogeometric graphs for $pG_{s-5}(s,t)$”, Vladikavkaz. Mat. Zh., 18:3 (2016), 35–42
Citation in format AMSBIB
\Bibitem{GutMak16}
\by A.~K.~Gutnova, A.~A.~Makhnev
\paper Extensions of pseudogeometric graphs for~$pG_{s-5}(s,t)$
\jour Vladikavkaz. Mat. Zh.
\yr 2016
\vol 18
\issue 3
\pages 35--42
\mathnet{http://mi.mathnet.ru/vmj588}
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  • This publication is cited in the following 3 articles:
    Citing articles in Google Scholar: Russian citations, English citations
    Related articles in Google Scholar: Russian articles, English articles
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