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- W2055200532 abstract "Let A(G) and D(G) be the adjacency matrix and the vertex degree matrix of a graph G, respectively. The Laplacian matrix of G is defined as L(G) = D(G) − A(G). The L-index of G, denoted by μ(G), is the largest root of the characteristic polynomial of L(G). The Laplacian Hoffman limit value H(L) is the limit of μ(Hn), where the graph Hn is obtained by attaching a pendant edge to the cycle Cn-1 of length n-1. It is known that H(L) = 2 + ϵ, where ϵ is the largest root of x3-4x-4. In this paper we characterize the structure of graphs whose L-index does not exceed 4.5, and we completely describe those graphs whose L-index does not exceed H(L). By doing so we complete the so-called Hoffman program w.r.t. the Laplacian theory of graph spectra." @default.
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- W2055200532 date "2013-02-01" @default.
- W2055200532 modified "2023-10-17" @default.
- W2055200532 title "On graphs whose Laplacian index does not exceed 4.5" @default.
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- W2055200532 doi "https://doi.org/10.1016/j.laa.2011.02.043" @default.
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