| HAL : hal-00613165, version 2 |
| arXiv : 1108.1012 |
| Fiche détaillée | Récupérer au format |
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| Versions disponibles : | v1 (04-08-2011) | v2 (25-08-2011) | v3 (01-06-2012) |
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| Turing degrees of multidimensional SFTs |
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| Emmanuel Jeandel 1Pascal Vanier 1 |
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| (03/08/2011) |
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| In this paper we are interested in computability aspects of subshifts and in particular Turing degrees of 2-dimensional SFTs (i.e. tilings). To be more precise, we prove that given any \pizu subset $P$ of $\{0,1\}^\NN$ there is a SFT $X$ such that $P\times\ZZ^2$ is recursively homeomorphic to $X\setminus U$ where $U$ is a computable set of points. As a consequence, if $P$ contains a recursive member, $P$ and $X$ have the exact same set of Turing degrees. On the other hand, we prove that if $X$ contains only non-recursive members, some of its members always have different but comparable degrees. This gives a fairly complete study of Turing degrees of SFTs. |
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| 1 : | Laboratoire d'informatique Fondamentale de Marseille (LIF) |
| CNRS : UMR6166 – Université de la Méditerranée - Aix-Marseille II – Université de Provence - Aix-Marseille I | |
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| Domaine | : | Informatique/Mathématique discrète |
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| Tilings – Subshift of Finite Type – Undecidability – \pizu classes – Turing degree |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00613165, version 2 | |
| http://hal.archives-ouvertes.fr/hal-00613165 | |
| oai:hal.archives-ouvertes.fr:hal-00613165 | |
| Contributeur : Pascal Vanier | |
| Soumis le : Jeudi 25 Août 2011, 11:09:01 | |
| Dernière modification le : Jeudi 25 Août 2011, 11:37:52 | |