The maximum state complexity for finite languages

  • Authors:
  • Cezar Câmpeanu;Wing Hong Ho

  • Affiliations:
  • Mathematics and Computer Science Department, University of Prince Edward Island, Prince Edward Island, Canada;I.B.M. Corporation, RTP, NC and University of Waterloo

  • Venue:
  • Journal of Automata, Languages and Combinatorics - Special issue: Selected papers of the fourth international workshop on descriptional complexity of formal systems
  • Year:
  • 2004

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Abstract

A measure of the complexity of a regular language L is the number of states in the smallest DFA accepting L. We study this quantity in the case of finite languages over a non-unary alphabet. We compute the maximum number of states of a minimal deterministic finite automaton (DFA) recognizing words of length less than or equal to some given integer. We also compute the maximum number of states of a minimal complete DFA that accepts only words of length equal to a given integer. For both cases, we prove that the upper bound can be reached by an explicit construction of a DFA, and we compute the asymptotic behavior of the upper bound.