A note on stutter-invariant PLTL

  • Authors:
  • Cong Tian;Zhenhua Duan

  • Affiliations:
  • Institute of Computing Theory and Technology, Xidian University, Xi'an 710071, PR China;Institute of Computing Theory and Technology, Xidian University, Xi'an 710071, PR China

  • Venue:
  • Information Processing Letters
  • Year:
  • 2009

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Abstract

Peled and Wilke proved that every stutter-invariant propositional linear temporal property is expressible in Propositional Linear Temporal Logic (PLTL) without @? (next) operators. To eliminate next operators, a translation @t which converts a stutter-invariant PLTL formula @f to an equivalent formula @t(@f) not containing @? operators has been given. By @t, for any formula @?@f, where @f contains no @? operators, a formula with the length of O(4^n|@f|) is always produced, where n is the number of distinct propositions in @f, and |@f| is the number of symbols appearing in @f. Etessami presented an improved translation @t^'. By @t^', for @?@f, a formula with the length of O(nx2^n|@f|) is always produced. We further improve Etessami's result in the worst case to O(nx2^n|@f|) by providing a new translation @t^'', and we show that the worst case will never occur.