A counterexample to the Hirsch Conjecture

A counterexample to the Hirsch Conjecture
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DOI:
10.4007/annals.2012.176.1.7
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发表时间:
2012-07-01
影响因子:
4.9
通讯作者:
Santos, Francisco
Santos, Francisco
中科院分区:
数学1区
文献类型:
--
作者:
Santos, Francisco

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Hirsch猜想(1957年)指出,具有n个方面的D维多物的图不能大于n-d(组合)直径(组合)。也就是说,多层的任何两个顶点都可以通过最多的n -d边缘的路径连接。本文提出了猜想的第一个反例。我们的多层尺寸为43和86个方面。它是从5维多层的,有48个方面违反了Klee和Walkup的D-步骤猜想的一定概括。
The Hirsch Conjecture (1957) stated that the graph of a d-dimensional polytope with n facets cannot have (combinatorial) diameter greater than n-d. That is, any two vertices of the polytope can be connected by a path of at most n - d edges.This paper presents the first counterexample to the conjecture. Our polytope has dimension 43 and 86 facets. It is obtained from a 5-dimensional polytope with 48 facets that violates a certain generalization of the d-step conjecture of Klee and Walkup.