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Trudy Instituta Matematiki i Mekhaniki UrO RAN, 2008, Volume 14, Number 3, Pages 127–131 (Mi timm46)  

Amply regular graphs with Hoffman's condition

V. V. Kabanov, S. V. Unegov

Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences
References:
Abstract: It is known that, if the minimal eigenvalue of a graph is $-2$, then the graph satisfies Hoffman's condition: for any generated complete bipartite subgraph $K_{1,3}$ (a 3-claw) with parts $\{p\}$ and $\{q_1, q_2,q_3\}$, any vertex distinct from $p$ and adjacent to the vertices $q_1$ and $q_2$ is adjacent to $p$ but not adjacent to $q_3$. We prove the converse statement for amply regular graphs containing a 3-claw and satisfying the condition $\mu>1$.
Received: 09.09.2008
English version:
Proceedings of the Steklov Institute of Mathematics (Supplementary issues), 2009, Volume 264, Issue 1, Pages S150–S154
DOI: https://doi.org/10.1134/S0081543809050125
Bibliographic databases:
Document Type: Article
UDC: 517.17
Language: Russian
Citation: V. V. Kabanov, S. V. Unegov, “Amply regular graphs with Hoffman's condition”, Trudy Inst. Mat. i Mekh. UrO RAN, 14, no. 1, 2008, 127–131; Proc. Steklov Inst. Math. (Suppl.), 264, suppl. 1 (2009), S150–S154
Citation in format AMSBIB
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\paper Amply regular graphs with Hoffman's condition
\serial Trudy Inst. Mat. i Mekh. UrO RAN
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\vol 14
\issue 1
\pages 127--131
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\jour Proc. Steklov Inst. Math. (Suppl.)
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\issue , suppl. 1
\pages S150--S154
\crossref{https://doi.org/10.1134/S0081543809050125}
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