Wanfang Chen

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20222026

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math.CO2026

Strong counterexamples to a supersaturation question of Ma-Yuan

Wanfang Chen, Long-Tu Yuan

For a graph $F$ , let $h_{F} (n, q)$ be the minimum number of copies of $F$ in an $n$ -vertex graph with $ex (n, F) + q$ edges, where $ex (n, F)$ is the maximum number of edg…

math.CO2022

A stability theorem for multi-partite graphs

Wanfang Chen, Changhong Lu, Long-Tu Yuan

The Erdős-Simonovits stability theorem is one of the most widely used theorems in extremal graph theory. We obtain an Erdős-Simonovits type stability theorem in multi-partite graph…