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arXiv 0909.0393math.LOcs.CCcs.LO
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关于Borel层次之外的可识别树语言

On Recognizable Tree Languages Beyond the Borel Hierarchy

Olivier Finkel, Pierre Simonnet

摘要:

研究了非Borel可识别树语言在解析集差层次上的拓扑复杂性。我们证明了,对于每一个整数$n \geq 1$,都有一个$D_{ω^n}({\bf Σ}^1_1)$ -完全树语言L_n被一个(非确定性)Muller树自动机所接受.另一方面,我们证明了一个明确的Büchi树自动机接受的树语言必须是Borel。然后我们考虑对策树语言$W_{(i,k)}$,Mostowski-Rabin指数$(i, k)$。证明了$D_{ω^n}({\bf Σ}^1_1)$ -完全树语言L_n对于$k-i \geq 2$可Wadge约简为对策树语言$W_{(i, k)}$.特别是,这些语言$W_{(i, k)}$不属于$α< ω^ω$的任何$D_α({\bf Σ}^1_1)$类。

英文摘要:

We investigate the topological complexity of non Borel recognizable tree languages with regard to the difference hierarchy of analytic sets. We show that, for each integer $n \geq 1$, there is a $D_{ω^n}({\bf Σ}^1_1)$-complete tree language L_n accepted by a (non deterministic) Muller tree automaton. On the other hand, we prove that a tree language accepted by an unambiguous Büchi tree automaton must be Borel. Then we consider the game tree languages $W_{(i,k)}$, for Mostowski-Rabin indices $(i, k)$. We prove that the $D_{ω^n}({\bf Σ}^1_1)$-complete tree languages L_n are Wadge reducible to the game tree language $W_{(i, k)}$ for $k-i \geq 2$. In particular these languages $W_{(i, k)}$ are not in any class $D_α({\bf Σ}^1_1)$ for $α< ω^ω$.

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