diveq: are two agents divergence equivalent?
This is observational equivalence which respects divergence. A state is
divergent in this sense if it can perform an infinite sequence of
unobservable actions (tau for CCS or 1 for SCCS), or if it can
reach an unguarded occurrence of the divergent agent, @, through some
sequence of unobservable actions.
Edinburgh Concurrency Workbench (v7.1).
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