All linear-time congruences for familiar operators part 2: infinite LTSs

  • Authors:
  • Antti Valmari

  • Affiliations:
  • Department of Software Systems, Tampere University of Technology, Tampere, Finland

  • Venue:
  • CONCUR'12 Proceedings of the 23rd international conference on Concurrency Theory
  • Year:
  • 2012

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Abstract

In a previous publication, we enumerated all stuttering-insensitive linear-time (in a well-defined sense) congruences with respect to action prefix, hiding, relational renaming, and parallel composition for finite labelled transition systems. There are 20 of them. They are built from the alphabet, traces, two kinds of divergence traces, and five kinds of failures. Now we remove the finiteness assumption. To re-establish the congruence property, four kinds of infinite traces are needed. Some congruences split to two and some to three, yielding altogether 40 congruences. Like its predecessor, because of lack of space, also this publication concentrates on proving the absence of more congruences.