The quest for a tight translation of büchi to co-büchi automata

  • Authors:
  • Udi Boker;Orna Kupferman

  • Affiliations:
  • School of Computer Science and Engineering, Hebrew University, Israel;School of Computer Science and Engineering, Hebrew University, Israel

  • Venue:
  • Fields of logic and computation
  • Year:
  • 2010

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Abstract

The Büchi acceptance condition specifies a set a of states, and a run is accepting if it visits α infinitely often. The co-Büchi acceptance condition is dual, thus a run is accepting if it visits α only finitely often. Nondeterministic Büchi automata over words (NBWs) are strictly more expressive than nondeterministic co-Büchi automata over words (NCWs). The problem of the blow-up involved in the translation (when possible) of an NBW to an NCW has been open for several decades. Until recently, the best known upper bound was 2O(n log n) and the best lower bound was n. We describe the quest to the tight 2Θ(n) bound.