Properties of Z specifications

Abstract
In this paper we show how to calculate properties of specifications written in the Z notation. In particular, we show how the precondition of an operation may be derived using rewrite rules and an application-oriented theory. As an example, we take part of the specification of an industrial-sized problem. If proofs are conducted at the level of the schema , then the structure of the proof follows the structure of the specification, and the technique scales up for verification in the large.

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