Combinatorics | Hypergraphs | Finite geometry | Projective geometry

Blocking set

In geometry, specifically projective geometry, a blocking set is a set of points in a projective plane that every line intersects and that does not contain an entire line. The concept can be generalized in several ways. Instead of talking about points and lines, one could deal with n-dimensional subspaces and m-dimensional subspaces, or even more generally, objects of type 1 and objects of type 2 when some concept of intersection makes sense for these objects. A second way to generalize would be to move into more abstract settings than projective geometry. One can define a blocking set of a hypergraph as a set that meets all edges of the hypergraph. (Wikipedia).

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Arc (projective geometry) | Duality (projective geometry) | Claude Berge | Desarguesian plane | Hitting set | Fano plane | Game theory | Vertex cover | Homogeneous coordinates | Characteristic (algebra) | Field trace | Unital (geometry) | Hypergraph | Transversal (combinatorics) | László Rédei | Projective geometry | Square number | Projective plane | Geometry