Enumeration of PLCP-orientations of the 4-cube

Enumeration of PLCP-orientations of the 4-cube
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4 立方体 PLCP 方向的枚举

DOI:
10.1016/j.ejc.2015.03.010
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发表时间:
2015
影响因子:
1
通讯作者:
Lorenz Klaus and Hiroyuki Miyata
Lorenz Klaus and Hiroyuki Miyata
中科院分区:
数学3区
文献类型:
--
作者:
Endo M;Iwamoto M;Sugawara M;Araki Y;Mori T;Shimizu K;Setsu N;Kobayashi E;Tanzawa Y;Nakatani F;Chuman H;Higashi T;Kawai A.;疋田理奈,東堀紀尚,福岡裕樹,宮本順,川元龍夫,森山啓司;Lorenz Klaus and Hiroyuki Miyata

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线性互补问题(LCP)为线性规划、凸二次规划和双矩阵对策等问题提供了一种统一的解决方法。一般的LCP已知是NP-难的,但有一些有希望的结果表明,LCP与P-矩阵(PLCP)可能是多项式时间可解的。然而,没有多项式时间算法的PLCP已被发现,PLCP的计算复杂性仍然是开放的。简单主枢(SPP)算法,也称为Bard型算法,是PLCP多项式时间算法的候选者。1978年,Stickney和沃森将SPP算法解释为寻找n-立方体的唯一汇方向的汇的算法族。他们进行了3-立方体的出现方向的枚举,以下称为PLCP方向。本文给出了4-立方体的PLCP-定向的计数。通过构造有向拟阵、推广P-矩阵和对有向拟阵进行可实现性分类来实现计数。在计算实验中获得的一些见解以及。
The linear complementarity problem (LCP) provides a unified approach to many problems such as linear programs, convex quadratic programs, and bimatrix games. The general LCP is known to be NP-hard, but there are some promising results that suggest the possibility that the LCP with a P-matrix (PLCP) may be polynomial-time solvable. However, no polynomial-time algorithm for the PLCP has been found yet and the computational complexity of the PLCP remains open. Simple principal pivoting (SPP) algorithms, also known as Bard-type algorithms, are candidates for polynomial-time algorithms for the PLCP. In 1978, Stickney and Watson interpreted SPP algorithms as a family of algorithms that seek the sink of unique-sink orientations of n-cubes. They performed the enumeration of the arising orientations of the 3-cube, hereafter called PLCP-orientations. In this paper, we present the enumeration of PLCP-orientations of the 4-cube. The enumeration is done via construction of oriented matroids generalizing P-matrices and realizability classification of oriented matroids. Some insights obtained in the computational experiments are presented as well.
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