The Rainbow at the End of the Line - A PPAD Formulation of the Colorful Carathéodory Theorem with Applications
The Rainbow at the End of the Line - A PPAD Formulation of the Colorful Carathéodory Theorem with Applications
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线尾的彩虹 - 彩色卡拉西奥多里定理的 PPAD 公式及其应用
DOI:
10.1137/1.9781611974782.87
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Yannik
中科院分区:
文献类型:
--
作者:
Meunier;Frédéric;Mulzer;Wolfgang;Sarrabezolles;Pauline;Yannik
LetC1,…,Cd+i bed+ 1 point sets in ℝd, each containing the origin in its convex hull. A subsetCof is called a colorful choice (or rainbow) forC1,…, Cd+1, if it contains exactly one point from each setCi.The colorful Carathéodory theorem states that there always exists a colorful choice forC1,…, Cd+1that has the origin in its convex hull. This theorem is very general and can be used to prove several other existence theorems in high-dimensional discrete geometry, such as the centerpoint theorem or Tverberg's theorem. The colorful Carathéodory problem (ColorfulCarathéodory) is the computational problem of finding such a colorful choice. Despite several efforts in the past, the computational complexity of ColorfulCarathéodoryin arbitrary dimension is still open.We show that ColorfulCarathéodorylies in the intersection of the complexity classes PPAD and PLS. This makes it one of the few geometric problems in PPAD and PLS that are not known to be solvable in polynomial time. Moreover, it implies that the problem of computing centerpoints, computing Tverberg partitions, and computing points with large simplicial depth is contained in PPAD Π PLS. This is the first nontrivial upper bound on the complexity of these problems.Finally, we show that our PPAD formulation leads to a polynomial-time algorithm for a special case of ColorfulCarathéodoryin which we have only two color classesC1andC2inddimensions, each with the origin in its convex hull, and we would like to find a set with half the points from each color class that contains the origin in its convex hull.
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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:
2011
期刊:
ACM-SIAM Symposium on Discrete Algorithms
影响因子:
--
作者:
C. Daskalakis;C. Papadimitriou
通讯作者:
C. Papadimitriou
影响因子:
2.7
作者:
K. Anstreicher;R. Bosch
通讯作者:
R. Bosch
DOI:
10.1112/jlms/s1-21.4.291
发表时间:
1946
影响因子:
1.2
作者:
R. Rado
通讯作者:
R. Rado