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arXiv 1101.3443cs.LOmath.LO
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Borel层次和Omega上下文无关语言

Borel Hierarchy and Omega Context Free Languages

Olivier Finkel

摘要:

本文对Lescow和Thomas [Logical Specifications of Infinite Computations,In:“A Decade of Concurrency”,Springer LNCS 803(1994),583-621]的问题给出了进一步的回答,证明了omega上下文无关语言的新拓扑性质:存在一些非Borel集的omega-CFL.我们不能确定一个omega-CFL是否是一个Borel集。我们还回答了Niwinski和Simonnet关于有限语言的Ω幂的问题,给出了一个有限上下文自由语言L的例子,使得L^Ω不是Borel集。然后,我们证明了一些递归的类似物前面的属性:特别是一个不能决定是否ω-CFL是一个算术集。

英文摘要:

We give in this paper additional answers to questions of Lescow and Thomas [Logical Specifications of Infinite Computations, In:"A Decade of Concurrency", Springer LNCS 803 (1994), 583-621], proving new topological properties of omega context free languages : there exist some omega-CFL which are non Borel sets. And one cannot decide whether an omega-CFL is a Borel set. We give also an answer to questions of Niwinski and Simonnet about omega powers of finitary languages, giving an example of a finitary context free language L such that L^omega is not a Borel set. Then we prove some recursive analogues to preceding properties: in particular one cannot decide whether an omega-CFL is an arithmetical set.

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