Let $G$ be any triangle-free graph with maximum degree $\Delta\leq 3$. Staton proved that the independence number of $G$ is at least 5/14n. Heckman and Thomas conjectured that Staton's result can be strengthened into a bound on the fractional chromatic number of $G$, namely $\chi_f(G)\leq 14/5. Recently, Hatami and Zhu proved $\chi_f(G) \leq 3 -{ 3/64}$. In this paper, we prove $\chi_f(G) \leq 3- 3/43$.
Categories: math.CO