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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

aforallx:I(x) => O(x,f(x))

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