Q-integral graphs with at most two vertices of degree greater than or equal to three
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DOI: 10.1016/j.laa.2020.03.027
Abstract: Abstract Let G a graph on n vertices. The signless Laplacian matrix of G, denoted by Q ( G ) , is defined as Q ( G ) = D ( G ) + A… read more here.
Keywords: graphs two; two vertices; vertices degree; integral graphs ... See more keywords
A decomposition of signed graphs with two eigenvalues
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DOI: 10.2298/fil2006949s
Abstract: In this study we consider connected signed graphs with 2 eigenvalues that admit a vertex set partition such that the induced signed graphs also have 2 eigenvalues, each. We derive some spectral characterizations, along with… read more here.
Keywords: signed graphs; two eigenvalues; decomposition signed; graphs two ... See more keywords