Abstract
The concept of angelic nondeterminism has traditionally been employed in the refinement calculus. Despite different notions having been proposed in the context of process algebras, namely Communicating Sequential Processes (CSP), the analogous counterpart to the angelic choice operator of the monotonic predicate transformers, has been elusive. In order to consider this concept in the context of reactive processes, we introduce a new theory in the setting of Hoare and He’s Unifying Theories of Programming (UTP). Based on a theory of designs with angelic nondeterminism previously developed, we show how these processes can be similarly expressed as reactive designs. Furthermore, a Galois connection is established with the existing theory of reactive processes and a bijection is also found with respect to the subset of non-angelic processes.
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