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arXiv 0812.1601cs.CC
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Scarf为Ppad完成

Scarf is Ppad-Complete

Shiva Kintali

摘要:

斯卡夫引理是组合数学中的基本结果之一,最初被引入研究N人博弈的核心。在过去的四十年里,斯卡夫引理的实用性已经在几个重要的寻求“稳定”解的组合问题中得到了证明。然而,计算版本的斯卡夫引理(SCARF)的复杂性仍然是开放的。在本文中,我们证明了SCARF是完全的复杂性类PPAD。这证明了SCARF与Brouwer不动点定理和Sperner引理的计算版本一样困难。因此,没有多项式时间的算法SCARF,除非PPAD \subseteq P。我们还表明,分数稳定路径问题和寻找强分数核有向图是PPAD困难的。

英文摘要:

Scarf's lemma is one of the fundamental results in combinatorics, originally introduced to study the core of an N-person game. Over the last four decades, the usefulness of Scarf's lemma has been demonstrated in several important combinatorial problems seeking "stable" solutions. However, the complexity of the computational version of Scarf's lemma (SCARF) remained open. In this paper, we prove that SCARF is complete for the complexity class PPAD. This proves that SCARF is as hard as the computational versions of Brouwer's fixed point theorem and Sperner's lemma. Hence, there is no polynomial-time algorithm for SCARF unless PPAD \subseteq P. We also show that fractional stable paths problem and finding strong fractional kernels in digraphs are PPAD-hard.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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