The Alon-Tarsi number of 4-regular circulant graphs

Abstract

This paper studies the Alon-Tarsi number of connected $4$-regular circulant graphs $C_n(s,t)$, where $1\le s<t<n/2$. We prove that if $n=\ell p^r$, where $p$ is an odd prime, $r\ge 1$, and $t\equiv\pm s\pmod{\ell}$, then $\operatorname{AT}(C_n(s,t))=3$ if $\ell$ is even, or if $\ell\ge 3$ is odd and $p\nmid 2^\ell-2$. We also prove that $\operatorname{AT}(C_{6m}(2,3))=3$ for $m\ge 2$, and $\operatorname{AT}(C_n(1,3))=3$ for $n\ge 8$.