Non-definability of Languages by Generalized First-order Formulas over (N,+)

  • Authors:
  • Andreas Krebs;A. V. Sreejith

  • Affiliations:
  • -;-

  • Venue:
  • LICS '12 Proceedings of the 2012 27th Annual IEEE/ACM Symposium on Logic in Computer Science
  • Year:
  • 2012

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Abstract

We consider first-order logic with monoidal quantifiers over words. We show that all languages with a neutral letter, definable using the addition predicate are also definable with the order predicate as the only numerical predicate. Let S be a subset of monoids. Let L be the logic closed under quantification over the monoids in S. Then we prove that L[