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Trudy Instituta Matematiki i Mekhaniki UrO RAN, 2018, Volume 24, Number 3, Pages 91–97
DOI: https://doi.org/10.21538/0134-4889-2018-24-3-91-97
(Mi timm1554)
 

On a vertex-symmetric graph with intersection array {205, 136, 1; 1, 68, 205}

A. M. Kagazezheva

Kabardino-Balkar State University, Faculty of Mathematics
References:
Abstract: A. Makhnev and D. Paduchikh found intersection arrays of distance-regular graphs that are locally strongly regular with the second eigenvalue 3. A. Makhnev and M. Samoilenko added to this list the intersection arrays {196, 76, 1; 1, 19, 196} and {205, 136, 1; 1, 68, 205}. However, graphs with these intersection arrays cannot be locally strongly regular. The existence of graphs with these intersection arrays is unknown. We find possible orders and fixed-point subgraphs for the elements of the automorphism group of a distance-regular graph with intersection array {205, 136, 1; 1, 68, 205}. It is proved that a vertex-transitive distance-regular graph with this intersection array is a Cayley graph.
Keywords: distance-regular graph, automorphism.
Received: 21.05.2018
Bibliographic databases:
Document Type: Article
UDC: 519.17+512.54
MSC: 05C25, 20B25
Language: Russian
Citation: A. M. Kagazezheva, “On a vertex-symmetric graph with intersection array {205, 136, 1; 1, 68, 205}”, Trudy Inst. Mat. i Mekh. UrO RAN, 24, no. 3, 2018, 91–97
Citation in format AMSBIB
\Bibitem{Kag18}
\by A.~M.~Kagazezheva
\paper On a vertex-symmetric graph with intersection array {205, 136, 1; 1, 68, 205}
\serial Trudy Inst. Mat. i Mekh. UrO RAN
\yr 2018
\vol 24
\issue 3
\pages 91--97
\mathnet{http://mi.mathnet.ru/timm1554}
\crossref{https://doi.org/10.21538/0134-4889-2018-24-3-91-97}
\elib{https://elibrary.ru/item.asp?id=35511279}
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