Main 𝐐-eigenvalues of quasi-threshold graphs
arxiv(2024)
摘要
In this note, we present a structural description of certain connected
cographs having k ≥ 2 main signless Laplacian eigenvalues. This result
allows us to characterize the cographs which are quasi-threshold graphs with
two main 𝐐-eigenvalues. In addition, we describe all the
quasi-threshold graphs belonging to the subclass of generalized core-satellite
graphs with k ≥ 2 main 𝐐-eigenvalues.
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