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Definition: For every function f: A -> B, a relation I subset A and a relation O subset A x B, we call the formula

forall x: I(x) => O(x, f(x))
a specification of f with input condition I and output condition O.

If the formula is true, then f implements the specification.

We want to verify whether a function implements a specification.

Author: Wolfgang Schreiner
Last Modification: November 24, 1999

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