Abstract
Since the early 90’s (after the seminal article of R. Back [4]), the refinement of stuttering steps [5] are performed by means of new actions (called here events) refining skip. It is shown in this article that such a refinement method is not always possible in the development of large systems. We shall instead use events refining some kind of non-deterministic actions maintaining the invariant (sometimes called keep). We show that such new refinements are completely safe. In a second part, we explain how such a mechanism can be used to express some reachability conditions that were otherwise expressed using some special temporal logic statements à la TLA [5] in a previous article [2]. Examples will be used to illustrate our proposals.
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References
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Abrial, JR., Cansell, D., Méry, D. (2005). Refinement and Reachability in Event_B. In: Treharne, H., King, S., Henson, M., Schneider, S. (eds) ZB 2005: Formal Specification and Development in Z and B. ZB 2005. Lecture Notes in Computer Science, vol 3455. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11415787_14
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DOI: https://doi.org/10.1007/11415787_14
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