Another look at abstraction in process algebra
14th International Colloquium on Automata, languages and programming
Branching time and abstraction in bisimulation semantics
Journal of the ACM (JACM)
The meaning of negative premises in transition system specifications
Journal of the ACM (JACM)
A Calculus of Communicating Systems
A Calculus of Communicating Systems
A Modal Characterisation of Observable Machine-Behaviour
CAAP '81 Proceedings of the 6th Colloquium on Trees in Algebra and Programming
Branching time and orthogonal bisimulation equivalence
Theoretical Computer Science
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This paper is about orthogonal bisimulation, a notion introduced by Bergstra, Ponse and van der Zwaag in 2003. Orthogonal bisimulation is a refinement of branching bisimulation, in which consecutive tau's (silent steps) can be compressed into one (but not zero) tau's. The main advantage of orthogonal bisimulation, compared to branching bisimulation, is that it combines better with priorities. This paper presents the notion of a compression structure of a process. It is proved that two processes are orthogonally bisimilar if and only if they have the same compression structure. Thus compression structure characterizes orthogonal bisimulation in the same way as branching structure (van Glabbeek, 1993) characterizes branching bisimulation.