Extended Double Covers and Homomorphism Bounds of Signed Graphs
Extended Double Covers and Homomorphism Bounds of Signed Graphs
A \emph{signed graph} $(G, \sigma)$ is a graph $G$ together with an assignment $\sigma:E(G) \rightarrow \{+,-\}$. The notion of homomorphisms of signed graphs is a relatively new development which allows to strengthen the connection between the theories of minors and colorings of graphs. Following this thread of thoughts, we investigate …