Year: 2026
Type: preprint
Abstract: For each integer $k \ge 2$, we prove that an abelian group $Γ$ satisfies $\exp(Γ) \in \{1,\dots,k\} \cup \{2,4,\dots,2k\}$ if and only if it admits no non-bipartite Cayley graph whose circular chromatic number is strictly less than $2 + \frac{2}{k-1}$. This refines the algebraic characterization by Krebs and Sankar of abelian groups that admit $3$-chromatic Cayley graphs.
Source: arXiv (Cornell University)
Authors: Enami, Kengo, Matsushita, Takahiro
Institutions: Shinshu University, Kitasato University
Language: English
Topic: Finite Group Theory Research
Subfield: Discrete Mathematics and Combinatorics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222605445