We present a refinement strategy for Circus, which is the combination of Z, CSP, and the
refinement calculus in the setting of Hoare and He's unifying theories of programming. The …

The lack of formalism in most software developments can lead to a loss of precision and
correctness in the resulting software. Formal techniques of program development have been …

Previously, we presented Circus, an integration of Z, CSP, and Morgan's refinement
calculus, with a semantics based on the unifying theories of programming. Circus provides a …

We outline a probabilistic denotational semantics for the RoboChart language, a
diagrammatic, domain-specific notation for describing robotic controllers with their hardware …

As software complexity increases, so does the need for precision. For some areas, such as
high-integrity and safety-critical domains, this precision is imperative rather than optional. To …

Functional transposition is a technique for converting relations into functions aimed at
developing the relational algebra via the algebra of functions. This paper attempts to …

Our increasing reliance on software systems requires reliable software. Mainstream software
manufacture, however, is not rigorous and precise, and resulting software lacks the desired …

Circus is a combination of Z, CSP, and the refinement calculus, and is based on Hoare &
He's Unifying Theories of Programming. A model checker is being constructed for the …

We dedicate this paper with great respect and friendship to He Jifeng on the occasion of his
80th birthday. Our research group owes much to him. The authors have over 150 …

CSP∥ B is an approach to combining the process algebra CSP with the formal development
method B, enabling the formal description of systems involving both event-oriented and state …