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Vertex colouring, Edge Colouring, List Colouring, Fractional Chromatic Number and other variants of graph colouring problems are all on topic.

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Constructing orientations that increase (directed) distances between vertices in a maximum i...

An orientation of a simple undirected graph $G=(V,E)$ is a directed graph $G' = (V,E')$ that is constructed by including either $(u,v) \in E'$ or $(v,u) \in E'$, but not both, for all $(u,v) \in E$. L …