Abstract

The transformational programming, method of algorithm derivation starts with a formal specification of the result to be achieved (which provides no indication of how the result is to be achieved), plus some informal ideas as to what techniques will be used in the implementation. The formal specification is then transformed into an implementation, by means of correctness-preserving refinement and transformation steps. The informal ideas are used to guide the selection of transformations to apply: since they only guide the selection of valid transformations, the ideas do not themselves have to be formalised.

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