The 3/5-conjecture for weakly $S(K_{1,3})$-free forests

Abstract

The $3/5$-conjecture for the domination game states that the game domination numbers of an isolate-free graph $G$ on $n$ vertices are bounded as follows: ${\gamma }_g(G)\le \frac{3n}{5}$ and ${\gamma }_g^{\prime }(G)\le \frac{3n+2}{5}$. Recent progress have been done on the subject and the conjecture is now proved for graphs with minimum degree at least $2$. One powerful tool, introduced by Bujtás is the so-called greedy strategy for \D. In particular, using this strategy, she has proved the conjecture for isolate-free forests without leafs at distance $4$. In this paper, we improve this strategy to extend the result to the larger class of weakly $S(K_{1,3})$-free forests, where a weakly $S(K_{1,3})$-free forest $F$ is an isolate-free forest without induced $S(K_{1,3})$, whose leafs are leafs of $F$ as well.