By Jean -Raymond Abrial (auth.), Didier Bert (eds.)
This e-book offers the refereed complaints of the second one overseas B convention, B'98, held in Montpellier, France, in April 1998.
The booklet offers 15 revised complete papers chosen from 29 submissions in addition to 4 invited contributions. The B approach is having fun with swiftly expanding acceptance for the specification and layout of software program. The publication covers all facets of the B expertise, together with introductory and methodological matters, theoretical investigations and commercial purposes, B extension proposals and aid instruments, in addition to comparisons or integration with different formal tools for software program development.
Read Online or Download B’98: Recent Advances in the Development and Use of the B Method: Second International B Conference Montpellier, France, April 22–24, 1998 Proceedings PDF
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Extra resources for B’98: Recent Advances in the Development and Use of the B Method: Second International B Conference Montpellier, France, April 22–24, 1998 Proceedings
Example text
2 Well D e f i n e d P r o o f O b l i g a t i o n s We give in this section the different proof obligations and their well-definedness lemmas. We distinguish machines, refinements and implementations because they do not have the same validation lemmas but we will show that, because a formula and its negation have the same well-definedness, the delta lemmas are quite similar for the three abstract machine types. We call V L ( M ) , the validation lemmas of the abstract machine M. D e f i n i t i o n 6.
T h e m o r e general expectations arise when one estimates, in the initial state of a probabilistic p r o g r a m , w h a t the w o r t h of its final state will be. T h a t e s t i m a t e , the 'expected w o r t h ' of the final state, is o b t a i n e d by s u m m i n g over all final states the w o r t h of the final state multiplied by the probability the p r o g r a m 'will go there' f r o m the initial state. Naturally the 'will go there' probabilities depend on ' f r o m where', and so t h a t expected w o r t h is a function of the initial state.
At the architectural design stage, major system components and their inter-relationships must be identified. So composition primitives must favour the independence of coding activity. This duality is illustrated by the open-closed principle Mey88. The open view means building larger components by extension.