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Sibirskie Èlektronnye Matematicheskie Izvestiya [Siberian Electronic Mathematical Reports], 2019, Volume 16, Pages 1385–1392
DOI: https://doi.org/10.33048/semi.2019.16.096
(Mi semr1137)
 

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

Discrete mathematics and mathematical cybernetics

On $Q$-polynomial distance-regular graphs $\Gamma$ with strongly regular graphs $\Gamma_2$ and $\Gamma_3$

I. N. Belousova, A. A. Makhneva, M. S. Nirovab

a N.N. Krasovskii Institute of Mathematics and Mechanics of the Ural Branch of the Russian Academy of Sciences, 16, S.Kovalevskaya str., Yekaterinburg, 620990, Russia
b Kabardino-Balkarian State University named after H.M. Berbekov, 175, Chernyshevsky str., Nalchik, 360004, Russia
Full-text PDF (148 kB) Citations (3)
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Abstract: Let $\Gamma$ be a distance-regular graph of diameter 3 with strongly regular graphs $\Gamma_2$ and $\Gamma_3$. Then $\Gamma$ has intersection array $\{t(c_2+1)+a_3,tc_2,a_3+1;1,c_2,t(c_2+1)\}$ (Nirova M.S.) If $\Gamma$ is $Q$-polynomial then either $a_3=0,t=1$ and $\Gamma$ is Taylor graph or $(c_2+1)=a_3(a_3+1)/(t^2-a_3-1)$. We found 4 infinite series feasible intersection arrays in this situation.
Keywords: distance-regular graph, $Q$-polynomial graph.
Received July 17, 2019, published October 7, 2019
Bibliographic databases:
Document Type: Article
UDC: 519.17
MSC: 05C25
Language: Russian
Citation: I. N. Belousov, A. A. Makhnev, M. S. Nirova, “On $Q$-polynomial distance-regular graphs $\Gamma$ with strongly regular graphs $\Gamma_2$ and $\Gamma_3$”, Sib. Èlektron. Mat. Izv., 16 (2019), 1385–1392
Citation in format AMSBIB
\Bibitem{BelMakNir19}
\by I.~N.~Belousov, A.~A.~Makhnev, M.~S.~Nirova
\paper On $Q$-polynomial distance-regular graphs $\Gamma$ with strongly regular graphs $\Gamma_2$ and $\Gamma_3$
\jour Sib. \`Elektron. Mat. Izv.
\yr 2019
\vol 16
\pages 1385--1392
\mathnet{http://mi.mathnet.ru/semr1137}
\crossref{https://doi.org/10.33048/semi.2019.16.096}
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  • This publication is cited in the following 3 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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    Full-text PDF :149
    References:23
     
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