About subdivisions of four blocks cycles $C(k_1,1,k_3,1)$ in digraphs with large chromatic number

Darine Al-Mniny, Soukaina Zayat

A cycle with four blocks $C(k_1,k_2,k_3,k_4)$ is an oriented cycle formed of four blocks of lengths $k_1,k_2,k_3$ and $k_4$ respectively. Recently, Cohen et al.…