2-Nested Simulation is not Finitely Equationally Axiomatizable

Luca Aceto, Willem Jan Fokkink, Anna Ingólfsdóttir

Abstract


2-nested simulation was introduced by Groote and Vaandrager
[10] as the coarsest equivalence included in completed trace equivalence
for which the tyft/tyxt format is a congruence format. In the linear
time-branching time spectrum of van Glabbeek [8], 2-nested simulation
is one of the few equivalences for which no finite equational axiomatization
is presented. In this paper we prove that such an axiomatization
does not exist for 2-nested simulation.

Keywords: Concurrency, process algebra, basic CCS, 2-nested simulation,
equational logic, complete axiomatizations.


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DOI: http://dx.doi.org/10.7146/brics.v7i20.20147
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ISSN: 0909-0878 

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