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Choice Functions and Extensive Operators

机译:选择函数和广义运算符

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The paper puts forth a theory of choice functions in a neat way connecting it to a theory of extensive operators and neighborhood systems. We consider classes of heritage choice functions satisfying conditions M, N, W, and C, or combinations of these conditions. In terms of extensive operators these classes can be considered as generalizations of symmetric, anti-symmetric and transitive binary relations. Among these classes we meet the well-known classes of matroids and convex geometries. Using a 'topological' language we discuss these classes of monotone extensive operators (or heritage choice functions) in terms of neighborhood systems. A remarkable inversion on the set of choice functions is introduced. Restricted to the class of heritage choice functions the inversion turns out to be an involution, and under this involution the axiom N is auto-inverse, whereas the axioms W and M change places.
机译:本文以一种简洁的方式提出了选择函数理论,并将其与广泛的算子和邻域系统理论联系起来。我们考虑满足条件M,N,W和C或这些条件组合的类别选择功能的类别。在广义运算符方面,这些类可以被视为对称,反对称和可传递二进制关系的概括。在这些类别中,我们遇到了著名的类拟阵和凸几何。使用“拓扑”语言,我们根据邻域系统讨论了这些类别的单调广泛运算符(或传统选择功能)。引入了对选择函数集的显着反转。限于传统选择功能类别,反演结果证明是对合,在这种对合下,公理N是自反的,而公理W和M会改变位置。

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