eq: are two agents observationally equivalent (weakly bisimilar)?
Returns true iff the agents are related by some weak bisimulation.
R is a weak bisimulation iff PRQ implies
whenever P -a-> P' there exists Q' st Q =^a=> Q' and P' R Q' and
whenever Q -a-> Q' there exists P' st P =^a=> P' and P' R Q'.
Edinburgh Concurrency Workbench (v7.1).
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