A non-determinstic process is viewed as a set of deterministic ones: its possible worlds.Each world represents a particular "solution" of non-deterministic processes are specifications,and the possible worlds represent the model space and thus the set of possilbe implementati9ons.Then,refinement is inclusion of sets of possible worlds and cna be used for stepwise specificaitosn.This notion of trefinement naturally induces new preorders (and equivalences) for processes that wecharacterize debnotaitonally,opertionally and axiomatically for ta basic proess algebra with nil,prefix and choice.
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