The extremal t-uniform unicyclic hypergraph on Estrada index

Abstract

For a t-uniform hypergraph H = (V(H), E(H)), the Estrada index EE(H) of H is defined as ?i?[n] e?i, where ?1,..., ?n are the eigevalues of the adjacency matrix of H. In this paper, the extremal t-uniform unicylic hypergraph which has maximum Estrada index are characterized.