Combinatorial Optimization

Combinatorial Optimization
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组合优化

DOI:
10.1007/978-3-642-32147-4_40
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发表时间:
2012
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通讯作者:
Huber A
Huber A
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作者:
Huber A

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本文研究了次模函数。在k= 1和k= 2的特殊情况下,离散函数的自然族包括次模函数和双模函数。特别地,我们推广了已知的次模和双次模函数的最小极大定理。这个定理断言(bi)次模函数的最小值可以通过求解(bi)次模多面体上的最大化问题来找到。定义了ak-次模多面体,证明了一个最小-极大定理叉-次模函数,给出了构造多面体顶点的贪心算法。
In this paper we investigatek-submodular functions. This natural family of discrete functions includes submodular and bisubmodular functions as the special casesk= 1 andk= 2 respectively.In particular we generalize the known Min-Max-Theorem for submodular and bisubmodular functions. This theorem asserts that the minimum of the (bi)submodular function can be found by solving a maximization problem over a (bi)submodular polyhedron. We define ak-submodular polyhedron, prove a Min-Max-Theorem fork-submodular functions, and give a greedy algorithm to construct the vertices of the polyhedron.