On directed version of the Sauer-Spender Theorem

Yun Wang, Jin Yan

Let $D=(V,A)$ be a digraph of order $n$ and let $W$ be any subset of $V$. We define the minimum semi-degree of $W$ in $D$ to be $δ^0(W)=\mbox{min}\{δ^+(W),δ^-(W)\}$, where ${\delta }^{+}(W)$…