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Appears in Collections:Computing Science and Mathematics Journal Articles
Peer Review Status: Refereed
Title: On bipartite graphs with complete bipartite star complements
Author(s): Rowlinson, Peter
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Keywords: Bipartite graph
Star complement
Symmetric design
Issue Date: Oct-2014
Date Deposited: 8-Sep-2014
Citation: Rowlinson P (2014) On bipartite graphs with complete bipartite star complements. Linear Algebra and Its Applications, 458, pp. 149-160.
Abstract: Let G be a bipartite graph with μ as an eigenvalue of multiplicity k>1k>1. We show that if G has Kr,sKr,s(1≤r≤s)(1≤r≤s) as a star complement for μ then k≤s-1k≤s-1; moreover if μ is non-main then k≤s-2k≤s-2 for large enough s . We provide examples of graphs in which various bounds on k or s are attained. We also describe the bipartite graphs with K1,sK1,s as a star complement for a non-main eigenvalue of multiplicity s-1>1s-1>1.
DOI Link: 10.1016/j.laa.2014.06.011
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