Ramsey goodness of stars and fans for the Hajós graph

Jiafu He, Haiyu Zeng, Yanbo Zhang

Given two graphs $G_1$ and $G_2$, the Ramsey number $R(G_1,G_2)$ denotes the smallest integer $N$ such that any red-blue coloring of the edges of $K_N$ contains either a red $G_1$…