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arXiv 2108.03641cs.GT
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切蛋糕协议模型的等价性

Equivalence of Models of Cake-Cutting Protocols

Paul W. Goldberg, Ioana Iaru

摘要:

切蛋糕问题涉及在$n$代理之间公平地划分异构的、可划分的资源。Brânzei等人[6]介绍了{ \em generalised cut and choose}(GCC)协议,这是一种将切蛋糕协议表示为树的形式模型,其中“cut”和“choose”节点对应于代理的动作,以及if-else语句。在本文中,我们确定了一个替代的和更简单的扩展形式的游戏模型蛋糕切割协议,我们称之为{ \em分支选择}(BC)协议。我们表明,类的协议,我们可以表示使用这个模型是不变的某些修改下,其定义。我们进一步证明,任何这样的协议可以转换为一个受限制的形式,代理人首先切蛋糕,然后得到不同的分支之间进行选择,导致不同的分配。最后,我们表明,这个模型具有相同的表达能力,GCC协议,即它们代表了相同的协议类的概念,涉及嫉妒的界限,每个代理可以保证自己的等价。为此,我们引入了一个新的概念,嫉妒等价的协议。

英文摘要:

The cake-cutting problem involves dividing a heterogeneous, divisible resource fairly between $n$ agents. Brânzei et al. [6] introduced {\em generalised cut and choose} (GCC) protocols, a formal model for representing cake-cutting protocols as trees with "cut" and "choose" nodes corresponding to the agents' actions, and if-else statements. In this paper, we identify an alternative and simpler extensive-form game model for cake-cutting protocols, that we call {\em branch choice} (BC) protocols. We show that the class of protocols we can represent using this model is invariant under certain modifications to its definition. We further prove that any such protocol can be converted to a restricted form in which the agents first cut the cake and then get to choose between various branches leading to different allocations. Finally, we show that this model has the same expressive power as GCC protocols, i.e. they represent the same class of protocols up to a notion of equivalence involving the bounds on envy that each agent can guarantee for themselves. For this purpose, we introduce a new notion of envy-equivalence of protocols.

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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