On a Class of Graphs with Large Total Domination Number

Selim Bahadır, Didem Gözüpek

Let $\gamma (G)$ and ${\gamma }_t(G)$ denote the domination number and the total domination number, respectively, of a graph $G$ with no isolated vertices. It is well-known that $γ_t(G) \leq 2γ(…