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Algebraic Characterizations of Regularity Properties in Bipartite Graphs

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10.1016/j.ejc.2013.05.006
 
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hdl:2117/22312

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Abiad Monge, Aida
Dalfó Simó, CristinaMés informacióMés informació
Fiol Mora, Miquel ÀngelMés informacióMés informacióMés informació
Document typeArticle
Defense date2013
Rights accessRestricted access - publisher's policy
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Regular and distance-regular characterizations of general graphs are well-known. In particular, the spectral excess theorem states that a connected graph GG is distance-regular if and only if its spectral excess (a number that can be computed from the spectrum) equals the average excess (the mean of the numbers of vertices at extremal distance from every vertex). The aim of this paper is to derive new characterizations of regularity and distance-regularity for the more restricted family of bipartite graphs. In this case, some characterizations of (bi)regular bipartite graphs are given in terms of the mean degrees in every partite set and the Hoffman polynomial. Moreover, it is shown that the conditions for having distance-regularity in such graphs can be relaxed when compared with general graphs. Finally, a new version of the spectral excess theorem for bipartite graphs is presented.
Related documenthttp://hdl.handle.net/2117/22446
CitationAbiad, A.; Dalfo, C.; Fiol, M. Algebraic characterizations of regularity properties in bipartite graphs. "European journal of combinatorics", 2013, vol. 34, núm. 8, p. 1223-1231. 
URIhttp://hdl.handle.net/2117/22312
DOI10.1016/j.ejc.2013.05.006
ISSN0195-6698
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0195669813000838
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  • Departament de Matemàtiques - Articles de revista [2.976]
  • COMBGRAPH - Combinatòria, Teoria de Grafs i Aplicacions - Articles de revista [290]
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