separated matroid

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K-set (geometry) — In discrete geometry, a k set of a finite point set S in the Euclidean plane is a subset of k elements of S that can be strictly separated from the remaining points by a line. More generally, in Euclidean space of higher dimensions, a k set of a… … Wikipedia
Separoid — In mathematics, a separoid is a relation defined in pairs of disjoint sets which is stable as an ideal in the canonical order induced by the contention. Many mathematical objects which appear to be quite different, find a common generalisation in … Wikipedia
List of NP-complete problems — Here are some of the more commonly known problems that are NP complete when expressed as decision problems. This list is in no way comprehensive (there are more than 3000 known NP complete problems). Most of the problems in this list are taken… … Wikipedia

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