Reducing the time complexity of testing for local threshold testability

A. N. Trahtman

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2 Scopus citations


A locally threshold testable language L is a language with the property that for some non-negative integers k and l and for some word u from L, a word v belongs to L iff: (1) the prefixes [suffixes] of length k -1 of words u and v coincide, (2) the number of occurrences of every factor of length k in both words u and v are either the same or greater than I - 1. A deterministic finite automaton is called locally threshold testable if the automaton accepts a locally threshold testable language for some l and k. New necessary and sufficient conditions for a deterministic finite automaton to be locally threshold testable are found. On the basis of these conditions, we modify the algorithm to verify local threshold testability of the automaton, and to reduce the time complexity of the algorithm. The algorithm is implemented as a part of the C/C++ package TESTAS, html.

Original languageEnglish
Pages (from-to)151-160
Number of pages10
JournalTheoretical Computer Science
Issue number1-2
StatePublished - 29 Nov 2004


  • Algorithm
  • Automaton
  • Graph
  • Threshold locally testable


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