Degree-similar Unicyclic Graphs are Isomorphic
Combinatorics
2026-07-18 v1
Abstract
Two graphs are degree-similar if their adjacency matrices and degree matrices are simultaneously similar. Godsil and Sun asked whether non-isomorphic degree-similar unicyclic graphs exist. We prove that they do not exist. Every graph degree-similar to a unicyclic graph is isomorphic to it. The proof uses a symbolic leaf-peeling algorithm to recover the rooted trees attached to the unique cycle, and a rigidity lemma for colored cycles to identify automorphisms of the cycle.
Cite
@article{arxiv.2607.16737,
title = {Degree-similar Unicyclic Graphs are Isomorphic},
author = {Yi-Liu Zhang and Yi-Zheng Fan},
journal= {arXiv preprint arXiv:2607.16737},
year = {2026}
}