On the coalition number of trees

Davood Bakhshesh, Michael A. Henning, Dinabandhu Pradhan

Let $G$ be a graph with vertex set $V$ and of order $n=|V|$, and let $\delta (G)$ and $\Delta (G)$ be the minimum and maximum degree of $G$, respectively. Two disjoint sets $V_1, V_2 \subset…