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# Suil O (오수일), An odd [1,b]-factor in regular graphs from eigenvalues

## June 19 Wednesday @ 4:30 PM - 5:30 PM

Room B232,
IBS (기초과학연구원)

An odd $[1,b]$-factor of a graph is a spanning subgraph $H$ such that for every vertex $v \in V(G)$, $1 \le d_H(v) \le b$, and $d_H(v)$ is odd. For positive integers $r \ge 3$ and $b \le r$, Lu, Wu, and Yang gave an upper bound for the third largest eigenvalue in an $r$-regular graph with even number of vertices to guarantee the existence of an odd [1,b]-factor.

In this talk, we improve their bound.