%T A Predicate Transformer Semantics for a Concurrent Language of Refinement
%A Ana Cavalcanti, Jim Woodcock
%E James S. Pascoe, Roger J. Loader, Vaidy S. Sunderam
%B Communicating Process Architectures 2002
%X Circus is a combination of Z and CSP; its chief
distinguishing feature is the inclusion of the ideas of the
refinement calculus. Our main objective is the definition of
refinement methods for concurrent programs. The original
semantic model for Circus is Hoare and He\[rs]s unifying
theories of programming. In this paper, we present an
equivalent semantics based on predicate transformers. With
this new model, we provide a more adequate basis for the
formalisation of refinement and verification\-condition
generation rules. Furthermore, this new framework makes it
possible to include logical variables and angelic
nondeterminism in Circus. The consistency of the relational
and predicate transformer models gives us confidence in
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