Nested semantics over finite trees are equationally hard

  • Authors:
  • Luca Aceto;Wan Fokkink;Rob van Glabbeek;Anna Ingólfsdóttir

  • Affiliations:
  • BRICS (Basic Research in Computer Science), Centre of the Danish National Research Foundation, Department of Computer Science, Aalborg University, Ft. Bajersvej 7E, 9220 Aalborg Ø, Denmark;CW1, Department of Software Engineering, Kruislaan 413, 1098 SJ Amsterdam, The Netherlands;INRIA, Sophia Antipolis, France;BRICS (Basic Research in Computer Science), Centre of the Danish National Research Foundation, Department of Computer Science, Aalborg University, Ft. Bajersvej 7E, 9220 Aalborg Ø, Denmark an ...

  • Venue:
  • Information and Computation
  • Year:
  • 2004

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Abstract

This paper studies nested simulation and nested trace semantics over the language BCCSP, a basic formalism to express finite process behaviour. It is shown that none of these semantics affords finite (in)equational axiomatizations over BCCSP. In particular, for each of the nested semantics studied in this paper, the collection of sound, closed (in)equations over a singleton action set is not finitely based.