Optimum basis of finite convex geometry

Optimum basis of finite convex geometry
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有限凸几何的最优基

DOI:
10.1016/j.dam.2017.06.009
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发表时间:
2012
期刊:
Discret. Appl. Math.
影响因子:
--
通讯作者:
K. Adaricheva
K. Adaricheva
中科院分区:
--
文献类型:
--
作者:
K. Adaricheva

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凸几何构成了具有唯一临界的闭包系统的一个子类,即U - c系统。我们证明了Adaricheva和Nation(2014)中引入的U - c系统的f基在凸几何中是最优的,在基的两个基本部分:二元含义的右侧(结论)和非二元含义的左侧(前提)。当凸几何满足Carousel性质或不具有d环时,非二元暗示的右侧也可以优化。后者推广了PL Hammer和a . Kogan关于无环角布尔函数的结果。序凸子集的凸几何也具有可处理的最优基。凸几何中最优基的可跟踪性问题一直是一个有待解决的问题。
Convex geometries form a subclass of closure systems with unique criticals, or U C-systems. We show that the F-basis introduced in Adaricheva and Nation (2014) for U C-systems, becomes optimum in convex geometries, in two essential parts of the basis: right sides (conclusions) of binary implications and left sides (premises) of non-binary ones. The right sides of non-binary implications can also be optimized, when the convex geometry either satisfies the Carousel property, or does not have D-cycles. The latter generalizes a result of PL Hammer and A. Kogan for acyclic Horn Boolean functions. Convex geometries of order convex subsets in a poset also have tractable optimum basis. The problem of tractability of optimum basis in convex geometries in general remains to be open.
霍恩规则的反拟阵表示及其在教育系统中的应用
DOI: 10.1016/j.jmp.2016.09.002
发表时间: 2017
影响因子: 1.8
作者:
H. Yoshikawa;H. Hirai;and K. Makino
通讯作者: and K. Makino