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m There is no need to restrict the set of strings to a set where no three strings intersect at the same point. Actually, the proof that Kn is a string graph is by made using n strings that intersect in one single point. |
added Category:NP-complete problems using HotCat Tag: Reverted |
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[[Category:Topological graph theory]]
[[Category:Intersection classes of graphs]]
[[Category:NP-complete problems]]
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