Watson-Crick ω-automata

  • Authors:
  • Elena Petre

  • Affiliations:
  • Department of Mathematics, University of Turku and Turku Center for Computer Science, Turku 20520, Finland

  • Venue:
  • Journal of Automata, Languages and Combinatorics
  • Year:
  • 2003

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Abstract

Watson-Crick ω-automata are finite automata working with infinite double-stranded words, where the two strands relate to each other through a complementary relation inspired by the DNA complementarity. There are several natural possibilities to define such automata, in particular to define the acceptance condition for such infinit double-stranded words. We present here several results on the equivalence of Büchi, Rabin, Streett, and Muller-like acceptance conditions. We prove that these acceptance conditions are equivalent for nondeterministic Watson-Crick ω-automata. For deterministic automata, we prove that the four conditions are equivalent for nonempty stateless automata, while the general case remains open. We also investigate the relationship between the classes of languages accepted by several types of Watson-Crick ω-automata.