Exploració per autor "Haemers, Willem H."

Ara es mostren els items 1-2 de 2

    • An interlacing approach for bounding the sum of Laplacian eigenvalues of graphs 

      Abiad, Aida; Fiol Mora, Miquel Àngel; Haemers, Willem H.; Perarnau Llobet, Guillem (2014)
      Text en actes de congrés
      Accés obert
      We apply eigenvalue interlacing techniques for obtaining lower and upper bounds for the sums of Laplacian eigenvalues of graphs, and characterize equality. This leads to generalizations of, and variations on theorems by ...

    • Cospectral mates for generalized Johnson and Grassmann graphs 

      Abiad Monge, Aida; D'haeseleer, Jozefien; Haemers, Willem H.; Simoens, Robin Nicolas (Elsevier, 2023-12)
      Article
      Accés obert
      We provide three infinite families of graphs in the Johnson and Grassmann schemes that are not uniquely determined by their spectrum. We do so by constructing graphs that are cospectral but non-isomorphic to these graphs.