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Inspired by notorious combinatorial optimization problems on graphs, in this paper we propose a series of related problems defined using a metric space and topology determined by a graph. Particularly, we present Independent Set, Vertex Cover, Chromatic Number and Treewidth problems on, so-called, continuous graphs where every edge is represented by a unit-length continuous interval rather than by a pair of vertices. If any point of any unit-interval edge is considered as a possible member of a hitting set or a cover, the classical combinatorial problems become trickier and many open questions arise. Notably, in many real-life applications, such continuous view on a graph is more natural than the classic combinatorial definition of a graph. |
