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On the signed chromatic number of some classes of graphs

Abstract : A signed graph $(G, \sigma)$ is a graph $G$ along with a function $\sigma: E(G) \to \{+,-\}$. A closed walk of a signed graph is positive (resp., negative) if it has an even (resp., odd) number of negative edges, counting repetitions. A homomorphism of a (simple) signed graph to another signed graph is a vertex-mapping that preserves adjacencies and signs of closed walks. The signed chromatic number of a signed graph $(G, \sigma)$ is the minimum number of vertices $|V(H)|$ of a signed graph $(H, \pi)$ to which $(G, \sigma)$ admits a homomorphism. Homomorphisms of signed graphs have been attracting growing attention in the last decades, especially due to their strong connections to the theories of graph coloring and graph minors. These homomorphisms have been particularly studied through the scope of the signed chromatic number. In this work, we provide new results and bounds on the signed chromatic number of several families of signed graphs (planar graphs, triangle-free planar graphs, $K_n$-minor-free graphs, and bounded-degree graphs).
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Contributor : Julien Bensmail Connect in order to contact the contributor
Submitted on : Sunday, October 17, 2021 - 12:27:54 PM
Last modification on : Saturday, December 4, 2021 - 3:07:34 AM


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Julien Bensmail, Sandip Das, Soumen Nandi, Théo Pierron, Sagnik Sen, et al.. On the signed chromatic number of some classes of graphs. Discrete Mathematics, Elsevier, 2022, 345, pp.112664. ⟨10.1016/j.disc.2021.112664⟩. ⟨hal-02947399v2⟩



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