On a Class of Graphs with Large Total Domination Number

On a Class of Graphs with Large Total Domination Number

Blog Article

Let $gamma(G)$ and $gamma_t(G)$ denote the domination number and the total domination number, respectively, of a m02n3ll/a graph $G$ with no isolated vertices.It is well-known that $gamma_t(G) leq 2gamma(G)$.We provide a characterization of a large family of graphs (including chordal graphs) satisfying $gamma_t(G)= 2gamma(G)$, strictly blue banana gorra generalizing the results of Henning (2001) and Hou et al.(2010), and partially answering an open question of Henning (2009).