Communications in Mathematical Sciences

Volume 12 (2014)

Number 6

H+-eigenvalues of Laplacian and signless Laplacian tensors

Pages: 1045 – 1064



Liqun Qi (Department of Applied Mathematics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong)


We propose a simple and natural definition for the Laplacian and the signless Laplacian tensors of a uniform hypergraph. We study their $\mathrm{H}^{+}$-eigenvalues, i.e., $\mathrm{H}$-eigenvalues with nonnegative $\mathrm{H}$-eigenvectors, and $\mathrm{H}^{++}$-eigenvalues, i.e., $\mathrm{H}$-eigenvalues with positive $\mathrm{H}$-eigenvectors. We show that each of the Laplacian tensor, the signless Laplacian tensor, and the adjacency tensor has at most one $\mathrm{H}^{++}$-eigenvalue, but has several other $\mathrm{H}^{+}$-eigenvalues. We identify their largest and smallest $\mathrm{H}^{+}$-eigenvalues, and establish some maximum and minimum properties of these $\mathrm{H}^{+}$-eigenvalues. We then define analytic connectivity of a uniform hypergraph and discuss its application in edge connectivity.


Laplacian tensor, signless Laplacian tensor, uniform hypergraph, $\mathrm{H}^{+}$-eigenvalue

2010 Mathematics Subject Classification

05C65, 15A18

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