Concatenation of Regular Languages and Descriptional Complexity

  • Authors:
  • Galina Jirásková

  • Affiliations:
  • Mathematical Institute, Slovak Academy of Sciences, Košice, Slovakia 040 01

  • Venue:
  • CSR '09 Proceedings of the Fourth International Computer Science Symposium in Russia on Computer Science - Theory and Applications
  • Year:
  • 2009

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Abstract

We investigate the deterministic and nondeterministic state complexity of languages that can be obtained as the concatenation of two regular languages represented by deterministic and nondeterministic finite automata. In the nondeterministic case, we show that the whole range of complexities from 1 to m + n can be obtained using a binary alphabet. In the deterministic case, we get the whole range of complexities from 1 to m ·2 n *** 2 n *** 1, however, to describe appropriate automata we use a growing alphabet.