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On infinite real trace rational languages of maximum topological complexity
Zapiski Nauchnykh Seminarov POMI, Computational complexity theory. Part IX, Tome 316 (2004), pp. 205-223 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider the set $\mathbb R^{\omega}(\Gamma,D)$ of infinite real traces, over a dependence alphabet $(\Gamma,D)$ with no isolated letter, equipped with the topology induced by the prefix metric. We then prove that all rational languages of infinite real traces are analytic sets. We reprove also that there exist some rational languages of infinite real traces which are analytic but non Borel sets, and even ${\boldsymbol{\Sigma}}^1_1$-complete, hence of maximum possible topological complexity. For that purpose we give an example of $\boldsymbol{\Sigma}^1_1$-complete language which is fundamentally different from the known example of $\boldsymbol{\Sigma}^1_1$-complete infinitary rational relation given in [10]. 
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O. Finkel; J.-P. Ressayre; P. Simonnet. On infinite real trace rational languages of maximum topological complexity. Zapiski Nauchnykh Seminarov POMI, Computational complexity theory. Part IX, Tome 316 (2004), pp. 205-223. http://geodesic.mathdoc.fr/item/ZNSL_2004_316_a10/

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