Some upper bounds for the signless Laplacian spectral radius of digraphs

Weige Xi, Ligong Wang

Let $G=(V(G),E(G))$ be a digraph without loops and multiarcs, where $V(G)=\{v_1,v_2,\dots ,v_n\}$ and $E(G)$ are the vertex set and the arc set of $G$, respectively. Let $d_i^{+}$…