A logic for describing, not verifying, software

Erkenntnis 43 (3):321 - 338 (1995)
An important perquisite for verification of the correctness of software is the ability to write mathematically precise documents that can be read by practitioners and advanced users. Without such documents, we won't know what properties we should verify. Tabular expressions, in which predicate expressions may appear, have been found useful for this purpose. We frequently use partial functions in our tabular documentation. Conventional interpretations of expressions that describe predicates are not appropriate for our application because they do not deal with partial functions. Experience with this documentation has led us to choose a logic in which predicates are total but functions remain partial. We have found that this particular interpretation results in simpler expressions and is easily understood by practitioners.
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