Junran Yu

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math.CO2026

Perfect divisibility and perfect-Pollyanna in bull-free graphs

Ran Chen, Paras Vinubhai Maniya, Di Wu +1

A graph $G$ is {\em perfectly divisible} if, for each induced subgraph $H$ of $G$ , $V (H)$ can be partitioned into $A$ and $B$ such that $H [A]$ is perfect and $I ¨ (H [B]) < I ¨ (H)$ . A {\…

math.CO2026

Perfect Divisibility and Coloring of Some Bull-Free Graphs

Ran Chen, Di Wu, Junran Yu +1

A graph $G$ is {\em perfectly divisible} if, for each induced subgraph $H$ of $G$ , $V (H)$ can be partitioned into $A$ and $B$ such that $H [A]$ is perfect and $I ¨ (H [B]) < I ¨ (H)$ . A {\…