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Hardness of conjugacy and factorization of multidimensional subshifts of finite type.
Jeandel Emmanuel 1, Pascal Vanier 2
(2012-04-22)

We investigate here the hardness of conjugacy and factorization of subshifts of finite type (SFTs) in dimension $d>1$. In particular, we prove that the factorization problem is $\Sigma^0_3$-complete and the conjugacy problem $\Sigma^0_1$-complete in the arithmetical hierarchy.
1:  Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM)
CNRS : UMR5506 – Université Montpellier II - Sciences et techniques
2:  Laboratoire d'informatique Fondamentale de Marseille (LIF)
CNRS : UMR6166 – Université de la Méditerranée - Aix-Marseille II – Université de Provence - Aix-Marseille I
INFO/ESCAPE : Systèmes complexes, Automates et Pavages
Computer Science/Discrete Mathematics
Subshift of finite type – factorization – conjugacy – arithmetical hierarchy – computability – tilings – SFT
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