Subshifts as models for MSO logic

  • Authors:
  • Emmanuel Jeandel;Guillaume Theyssier

  • Affiliations:
  • LORIA, UMR 7503, Campus Scientifique, BP 239, 54 506 Vandoeuvre-lès-Nancy, France;LAMA (Université de Savoie, CNRS), Campus Scientifique, 73376 Le Bourget-du-lac cedex, France

  • Venue:
  • Information and Computation
  • Year:
  • 2013

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Abstract

We study the Monadic Second Order (MSO) Hierarchy over colorings of the discrete plane, and draw links between classes of formula and classes of subshifts. We give a characterization of existential MSO in terms of projections of tilings, and of universal sentences in terms of combinations of ''pattern counting'' subshifts. Conversely, we characterize logic fragments corresponding to various classes of subshifts (subshifts of finite type, sofic subshifts, all subshifts). Finally, we show by a separation result how the situation here is different from the case of tiling pictures studied earlier by Giammarresi et al.