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Mathematics of Plott choice functions | V.I. Danilov
; G.A.Koshevoy
; | Date: |
14 Apr 2003 | Subject: | Combinatorics | math.CO | Abstract: | This paper is devoted to a study of mathematical structures arising from choice functions satisfying the path independence property (Plott functions). We broaden the notion of a choice function by allowing of empty choice. This enables us to define a lattice structure on the set of Plott functions. Moreover, this lattice is functorially dependent on its base. We introduce a natural convex structure on the set of linear orders (or words) and show that Plott functions are in one-to-one correspondence with convex subsets in this set of linear orders. That correspondence is compatible with both lattice structures. Keywords: Convex geometries, shuffle, linear orders, lattices, direct image, path independence, convex structure | Source: | arXiv, math.CO/0304171 | Services: | Forum | Review | PDF | Favorites |
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