Peter Gorm Larsen. Towards Proof Rules for Looseness in Explicit Definitions from VDM-SL. March 1993.  Home/Search   Document Details and Download   Summary   Related Articles

....standardisation. The standard language, VDM SL , has a denotational model based semantics [BSI92] The development of its proof theory will involve extensions to the proof theory discussed here. One of these, involving the interpretation of loose expressions, is discussed in Larsen s work [Lar93] The logical framework used in the paper is briefly described in Section 2. Section 3 gives a flavour of our overall approach by describing the theory of predicate LPF and part of the theory of finite sets. Section then discusses two areas in which interesting problems have been encountered: ....

....details of the context from which it originated. This seems a more promising line of approach, but is likely to make the manipulation of expressions exceedingly cumbersome as a large amount of contextual information would appear to be needed. These issues are addressed in Larsen s research [Lar93] As a final note, however, it is worth recording that it is easy to describe these loose expressions when there is a unique value satisfying the predicate. In such a restricted case the defining axiom would use the unique existential quantifier as a guard hypothesis and the unique choice ....

Peter Gorm Larsen. Towards Proof Rules for Looseness in Explicit Definitions from VDM-SL. March 1993.

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