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This article is cited in 3 scientific papers (total in 3 papers)
On graphs in which neighborhoods of vertices are strongly regular with parameters (85,14,3,2) or (325,54,3,10)
M. M. Isakovaa, A. A. Makhnevbc, A. A. Tokbaevaa a Kabardino-Balkar State University, Nal'chik
b Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
c Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
Abstract:
J. Koolen posed the problem of studying distance regular graphs in which neighborhoods of vertices are strongly regular graphs with nonprincipal eigenvalue at most $t$ for a given positive integer$t$. This problem was solved earlier for $t=3$. In the case $t=4$, a reduction to graphs in which neighborhoods of vertices have parameters (352,26,0,2), (352,36,0,4), (243,22,1,2), (729,112,1,20), (204,28,2,4), (232,33,2,5), (676,108,2,20), (85,14,3,2), or (325,54,3,10) was obtained. In the present paper, we prove that a distance regular graph in which neighborhoods of vertices are strongly regular with parameters $(85,14,3,2)$ or $(325,54,3,10)$ has intersection array $\{85,70,1;1,14,85\}$ or $\{325,270,1;1,54,325\}$. In addition, we find possible automorphisms of a graph with intersection array $\{85,70,1;1,14,85\}$.
Keywords:
strongly regular graph, locally $\mathcal X$-graph, automorphism of a graph.
Received: 17.10.2015
Citation:
M. M. Isakova, A. A. Makhnev, A. A. Tokbaeva, “On graphs in which neighborhoods of vertices are strongly regular with parameters (85,14,3,2) or (325,54,3,10)”, Trudy Inst. Mat. i Mekh. UrO RAN, 22, no. 3, 2016, 137–143; Proc. Steklov Inst. Math. (Suppl.), 299, suppl. 1 (2017), 68–74
Linking options:
https://www.mathnet.ru/eng/timm1328 https://www.mathnet.ru/eng/timm/v22/i3/p137
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