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# Ringi Kim (김린기), The strong clique number of graphs with forbidden cycles

## March 31 Tuesday @ 4:30 PM - 5:30 PM KST

Room B232,
IBS (기초과학연구원)

The strong clique number of a graph $G$ is the maximum size of a set of edges of which every pair has distance at most two.

In this talk, we prove that every $\{C_5,C_{2k}\}$-free graph has strong clique number at most $k\Delta(G)-(k-1)$, which resolves a conjecture by Cames van Batenburg et al. We also prove that every $C_{2k}$-free graph has strong clique number at most $(2k−1)\Delta(G) + (2k−1)^2$, improving the previous known upper bound $10k^2 (\Delta(G)-1)$ due to Cames van Batenburg et al. This is joint work with Eun-Kyung Cho, Ilkyoo Choi, and Boram Park.