Some graphs whose second largest eigenvalue does not exceed 2 |
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Authors: | Zoran Stanić |
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Affiliation: | Faculty of Mathematics, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia |
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Abstract: | We determine all trees whose second largest eigenvalue does not exceed . Next, we consider two classes of bipartite graphs, regular and semiregular, with small number of distinct eigenvalues. For all graphs considered we determine those whose second largest eigenvalue is equal to . Some additional results are also given. |
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