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arXiv 1602.01581cs.GTcs.ITmath.COmath.IT
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关于高维简单对策的构造

On the Construction of High Dimensional Simple Games

Martin Olsen, Sascha Kurz, Xavier Molinero

摘要:

投票是将多个代理的偏好聚集到联合决策中的常用方法。如果偏好是二元的,即,“是”和“否”,每个投票系统都可以用(单调)布尔函数$χ\colon\{0,1\}^n\rightarrow \{0,1\}$来描述。然而,其朴素编码需要$2^n$位。阈值函数的子类,这是足够的同质代理,允许一个更简洁的表示使用$n$权重和一个阈值。对于异构代理,可以将$χ$表示为$k$阈值函数的交集。Taylor和Zwicker构造了一系列需要$k\ge 2^{\frac{n}{2}-1}$的例子,并提供了一个保证$k\le {n\choose {\lfloor n/2\rfloor}}\in 2^{n-o(n)}$的构造。认为最差情况的程度由Elkind等人确定。2008年,但不幸的是,分析结果是错误的。在这里,我们发现一个关系到编码理论,允许确定的最小数目$k$的一个子类的投票系统。作为应用,我们给出了$k\ge 2^{n-o(n)}$的一个构造,即,从表示复杂度的观点来看没有任何增益。

英文摘要:

Voting is a commonly applied method for the aggregation of the preferences of multiple agents into a joint decision. If preferences are binary, i.e., "yes" and "no", every voting system can be described by a (monotone) Boolean function $χ\colon\{0,1\}^n\rightarrow \{0,1\}$. However, its naive encoding needs $2^n$ bits. The subclass of threshold functions, which is sufficient for homogeneous agents, allows a more succinct representation using $n$ weights and one threshold. For heterogeneous agents, one can represent $χ$ as an intersection of $k$ threshold functions. Taylor and Zwicker have constructed a sequence of examples requiring $k\ge 2^{\frac{n}{2}-1}$ and provided a construction guaranteeing $k\le {n\choose {\lfloor n/2\rfloor}}\in 2^{n-o(n)}$. The magnitude of the worst-case situation was thought to be determined by Elkind et al.~in 2008, but the analysis unfortunately turned out to be wrong. Here we uncover a relation to coding theory that allows the determination of the minimum number $k$ for a subclass of voting systems. As an application, we give a construction for $k\ge 2^{n-o(n)}$, i.e., there is no gain from a representation complexity point of view.

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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