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| Content Provider | IEEE Xplore Digital Library | 
|---|---|
| Author | Poppleton, M.R. Banach, R.H. | 
| Copyright Year | 1999 | 
| Description | Author affiliation: Sch. of Math. & Inf. Sci., Coventry Univ., UK (Poppleton, M.R.) | 
| Abstract | Discusses a simple example that demonstrates various expressive limitations of the refinement calculus, and suggests a liberalization of refinement, called retrenchent, which supports an analogous formal development calculus. Useful concrete system behaviour can be specified outside the domain of pure refinement, and a case is made for fluidity between I/O and state components across the development step. A syntax and a formal definition are presented for retrenchment, which has some necessary properties for a formal development calculus: transitivity gives stepwise composition of retrenchments, while monotonicity w.r.t. the specification language constructors gives piecewise construction of retrenchments. | 
| Starting Page | 158 | 
| Ending Page | 165 | 
| File Size | 122537 | 
| Page Count | 8 | 
| File Format | |
| ISBN | 0769504159 | 
| DOI | 10.1109/ASE.1999.802189 | 
| Language | English | 
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) | 
| Publisher Date | 1999-10-12 | 
| Publisher Place | USA | 
| Access Restriction | Subscribed | 
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) | 
| Subject Keyword | Concrete Electrical equipment industry Computer science Specification languages Proposals Logic Veins Calculus | 
| Content Type | Text | 
| Resource Type | Article | 
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