Hierarchy and expansiveness in 2D subshifts of finite type

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Date/heure
Date(s) - 10/03/2015
11 h 00 min - 12 h 00 min

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In a 2D subshift of finite type (SFT), a direction l is called expansive if every point is uniquely determined by its contents along a finite strip of slope l.
We are interested in dynamical and computational properties of 2D subshifts of finite type with a unique direction of non-expansiveness (extremely deterministic). We prove, among other things, that the non-emptiness problem of extremely expansive 2D SFT is undecidable. The proofs and constructions are based on the notion of simulation and self-simulation, which was first used by Gacs and later by Durand, Romaschenko and Shen. In this talk, we are going to state the results and try to give a basic intuitive idea of the specific problems that arise when we try to construct extremely deterministic 2D SFT.

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Olivier CHABROL
Posts created 14

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