Titlebook: Higher Combinatorics; Proceedings of the N Martin Aigner Conference proceedings 1977 D. Reidel Publishing Company, Dordrecht 1977 Combinato

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Geometries Associated with Partially Ordered Sets (P) for k = 1, 2,…, and is representable as a linear map over every sufficiently large field. G. (P) is a gammoid, but every gammoid is a subgeometry of G.(P) for some partially ordered set P of height 3.