Changqing Xu

collaborators

2 papers

math.CO2026

The planar TurÃ¡n number of ${K_{4}, I^_{6}^{i}}$

Jing Chen, Kai Gao, Yongxin Lan +2

Let $H$ be a family of graphs. A graph is said to be $H$ -free if it contains no subgraph isomorphic to a graph in $H$ . The planar TurÃ¡n number $ex_{_…

math.CO2026

The Outerplanar TurÃ¡n Number of Double Stars

Chaofan Zhang, Yongxin Lan, Changqing Xu

Let $H$ be a nonempty graph. A graph is $H$ -free if it does not contain any copy of $H$ as a subgraph. The outerplanar TurÃ¡n number of $H$ , denoted by $e x_{_{O P}} (n, H)$ , i…

The planar TurÃ¡n number of {K4​,I^6i​}

The Outerplanar TurÃ¡n Number of Double Stars

The planar TurÃ¡n number of ${K_{4}, I^_{6}^{i}}$