Why extension-based proofs fail

Why extension-based proofs fail
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为什么基于扩展的证明会失败

DOI:
10.1145/3313276.3316407
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发表时间:
2019
期刊:
51st Annual ACM SIGACT Symposium on Theory of Computing
影响因子:
--
通讯作者:
Zhu, Leqi
Zhu, Leqi
中科院分区:
--
文献类型:
--
作者:
Alistarh, Dan;Aspnes, James;Ellen, Faith;Gelashvili, Rati;Zhu, Leqi

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在异步系统中不可能确定性地解决无等待共识。经典的证明使用一个配价参数,它通过重复扩展有限执行来构造无限执行。我们引入了基于扩展的证明,这是一类不可能性证明,它被建模为证明者和协议之间的交互,并且包含了价参数.使用基于组合拓扑的证明,我们已经证明了不可能以无等待的方式确定性地求解k-set一致性过程n>k≥ 2.然而,不知道是否有可能基于更简单的技术进行证明。我们表明,这种不可能的结果不能得到基于扩展的证明,因此,基于扩展的证明是有限的权力。
It is impossible to deterministically solve wait-free consensus in an asynchronous system. The classic proof uses a valency argument, which constructs an infinite execution by repeatedly extending a finite execution. We introduceextension-based proofs, a class of impossibility proofs that are modelled as an interaction between a prover and a protocol and that include valency arguments.Using proofs based on combinatorial topology, it has been shown that it is impossible to deterministically solvek-set agreement amongn>k≥ 2 processes in a wait-free manner. However, it was unknown whether proofs based on simpler techniques were possible. We show that this impossibility result cannot be obtained by an extension-based proof and, hence, extension-based proofs are limited in power.
DOI: --
发表时间: 2014
期刊:
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DOI: --
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期刊: ACM SIGACT-SIGOPS Symposium on Principles of Distributed Computing
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