Some Results on the Signless Laplacian Spectra of Unicyclic Graphs

الملخص EN

We determine the second to fourth largest (resp.

the second smallest) signless Laplacian spectral radii and the second to fourth largest signless Laplacian spreads together with the corresponding graphs in the class of unicyclic graphs with n vertices.

Moreover, we prove that one class of unicyclic graphs are determined by their signless Laplacian spectra.