Computational Aspects of the Colorful Carathéodory Theorem
Computational Aspects of the Colorful Carathéodory Theorem
复制标题
多彩卡拉西奥多里定理的计算方面
DOI:
10.1007/s00454-018-9979-y
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发表时间:
2015
影响因子:
0.8
通讯作者:
Yannik Stein
中科院分区:
文献类型:
--
作者:
Wolfgang Mulzer;Yannik Stein
Letbepoint sets, each containing the origin in its convex hull. We call these setscolor classes, and we call a sequencewith, for, acolorful choice. The colorful Carathéodory theorem guarantees the existence of acolorful choicethat also contains the origin in its convex hull. The computational complexity of finding such a colorful choice (ColorfulCarathéodory) is unknown. This is particularly interesting in the light of polynomial-time reductions from several related problems, such as computing centerpoints, toColorfulCarathéodory. We define a novel notion of approximation that is compatible with the polynomial-time reductions toColorfulCarathéodory: a sequence that contains at mostkpoints from each color class is called ak-colorful choice. We present an algorithm that for any fixed, outputs an-colorful choice containing the origin in its convex hull in polynomial time. Furthermore, we consider a related problem ofColorfulCarathéodory: in thenearest colorful polytopeproblem (Ncp), we are given setsthat do not necessarily contain the origin in their convex hulls. The goal is to find a colorful choice whose convex hull minimizes the distance to the origin. We show that computing a local optimum forNcpisPLS-complete, while computing a global optimum isNP-hard.
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影响因子:
0.8
作者:
Wolfgang Mulzer;Daniel Werner
通讯作者:
Daniel Werner
影响因子:
1.7
作者:
I. Bárány;S. Onn
通讯作者:
S. Onn
DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
K. S. Sarkaria
通讯作者:
K. S. Sarkaria
DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
I. Bárány
通讯作者:
I. Bárány
DOI:
10.1137/1.9781611974782.87
发表时间:
2017
期刊:
ArXiv
影响因子:
--
作者:
Meunier;Frédéric;Mulzer;Wolfgang;Sarrabezolles;Pauline;Yannik
通讯作者:
Yannik