Finite state automata representing two-dimensional subshifts

  • Authors:
  • Nataša Jonoska;Joni B. Pirnot

  • Affiliations:
  • University of South Florida, Department of Mathematics, Tampa, FL;Manatee Community College, Department of Mathematics, Bradenton, FL

  • Venue:
  • CIAA'07 Proceedings of the 12th international conference on Implementation and application of automata
  • Year:
  • 2007

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Abstract

We employ a two-dimensional automaton defined in [5] to recognize a class of two-dimensional shifts of finite type having the property that every admissable block found within the related local picture language can be extended to a point of the subshift. Here, we show that the automaton accurately represents the image of the represented two-dimensional shift of finite type under a block code. We further show that such automata can be used to check for a certain type of two-dimensional transitivity in the factor language of the corresponding shift space and how this relates to periodicity in the two-dimensional case. The paper closes with a notion of "follower sets" used to reduce the size of the automata representing two-dimensional sofic shifts.