Expressiveness of metric modalities for continuous time

  • Authors:
  • Yoram Hirshfeld;Alexander Rabinovich

  • Affiliations:
  • Sackler Faculty of Exact Sciences, Tel Aviv Univ., Israel;Sackler Faculty of Exact Sciences, Tel Aviv Univ., Israel

  • Venue:
  • CSR'06 Proceedings of the First international computer science conference on Theory and Applications
  • Year:
  • 2006

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Abstract

We prove a conjecture by A. Pnueli and strengthen it showing a sequence of “counting modalities” none of which is expressible in the temporal logic generated by the previous modalities, over the real line, or over the positive reals. We use this sequence to prove that over the real line there is no finite temporal logic that can express all the natural properties that arise when dealing with systems that evolve in continuous time.