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extensional equality : FOLDOC | extensional equality (Or extensionality). Functions, f and g are extensionally equal if and only if f x = g x for all x.
where "=" means both expressions fail to terminate (under some given reduction strategy) or they both terminate with the same basic value. Two functions may be extensionally equal but not inter-convertible (neither is reducible to the other). E.g. x . x+x and x . 2*x. See also observational equivalence, referential transparency.
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