Maxima of the $Q$-index: Graphs with no $K_{1,t}$-minor

Abstract

A graph is said to be \textit{$H$-minor free} if it does not contain $H$ as a minor. In this paper, we characteristic the unique extremal graph with maximal $Q$-index among all $n$-vertex $K_{1,t}$-minor free graphs ($t\ge 3$).

15 pages