Efficient separability of regular languages by subsequences and suffixes

  • Authors:
  • Wojciech Czerwiński;Wim Martens;Tomáš Masopust

  • Affiliations:
  • Institute for Computer Science, University of Bayreuth, Germany;Institute for Computer Science, University of Bayreuth, Germany;Institute for Computer Science, University of Bayreuth, Germany

  • Venue:
  • ICALP'13 Proceedings of the 40th international conference on Automata, Languages, and Programming - Volume Part II
  • Year:
  • 2013

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Abstract

When can two regular word languages K and L be separated by a simple language? We investigate this question and consider separation by piecewise- and suffix-testable languages and variants thereof. We give characterizations of when two languages can be separated and present an overview of when these problems can be decided in polynomial time if K and L are given by nondeterministic automata.