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arXiv 1707.01540math.CO
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关于随机交换稳定匹配

On random exchange-stable matchings

Boris Pittel

摘要:

考虑一组$n$男性和$n$女性,每个人都有自己的潜在婚姻伴侣偏好列表。稳定的婚姻是一种双方匹配,这样没有不匹配的一对(男人,女人)在匹配中更喜欢对方。它的非二部版本,具有偶数个$n$成员,被称为稳定室友问题。何塞·阿尔卡尔德(Jose Alcalde)提出了另一种交换稳定的单边匹配概念:在匹配中,没有两个成员会喜欢对方的伴侣而不是自己的伴侣。Katarina Cechlárová和David Manlove证明了e-稳定匹配判定问题对于两种匹配都是$NP$ -完全的。证明了e-稳定匹配的期望数在双边情形下渐近于$\left(\frac{πn}{2}\right)^{1/2}$,在单边情形下渐近于$e^{1/2}$.然而,该数值的标准差超过了$1.13^n$,(分别为$1.06^n$)。作为一个明显的副产品,存在至少具有$1.13^n$(分别为$1.06^n$)的偏好列表的实例。稳定匹配不存在稳定和e稳定匹配的概率至少为$1-e^{-n^{1/6+o(1)}}$,(分别为$1-O(2^{-n/2})$)。

英文摘要:

Consider the group of $n$ men and $n$ women, each with their own preference list for a potential marriage partner. The stable marriage is a bipartite matching such that no unmatched pair (man, woman) prefer each other to their partners in the matching. Its non-bipartite version, with an even number $n$ of members, is known as the stable roommates problem. Jose Alcalde introduced an alternative notion of exchange-stable, one-sided, matching: no two members prefer each other's partners to their own partners in the matching. Katarina Cechlárová and David Manlove showed that the e-stable matching decision problem is $NP$-complete for both types of matchings. We prove that the expected number of e-stable matchings is asymptotic to $\left(\frac{πn}{2}\right)^{1/2}$ for two-sided case, and to $e^{1/2}$ for one-sided case. However, the standard deviation of this number exceeds $1.13^n$, ($1.06^n$ resp.). As an obvious byproduct, there exist instances of preference lists with at least $1.13^n$ ($1.06^n$ resp.) e-stable matchings. The probability that there is no matching which is stable and e-stable is at least $1-e^{-n^{1/6+o(1)}}$, ($1-O(2^{-n/2})$ resp.).

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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