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# Jinha Kim (김진하), Collapsibility of Non-Cover Complexes of Graphs

## Tuesday, September 22, 2020 @ 4:30 PM - 5:30 PM KST

Room B232,
IBS (기초과학연구원)

Let $G$ be a graph on the vertex set $V$. A vertex subset $W \subset V$ is a cover of $G$ if $V \setminus W$ is an independent set of $G$, and $W$ is a non-cover of $G$ if $W$ is not a cover of $G$. The non-cover complex of $G$ is a simplicial complex on $V$ whose faces are non-covers of $G$. Then the non-cover complex of $G$ is the combinatorial Alexander dual of the independence complex of $G$. In this talk, I will show the $(|V(G)|-i\gamma(G)-1)$-collapsibility of the non-cover complex of a graph $G$ where $i\gamma(G)$ denotes the independence domination number of $G$ using the minimal exclusion sequence method. This is joint work with Ilkyoo Choi and Boram Park.