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・ extensible firmware interface
・ extensible hypertext markup language
・ extensible markup language
・ extensible shell
・ extensible stylesheet language
・ extensible stylesheet language transformations
・ extensible vax editor
・ extension
・ extension language kit
・ extensional
extensional equality
・ extensionality
・ exterior gateway protocol
・ external data representation
・ external machine interface
・ external memory
・ extra
・ extranet
・ extrapolate
・ extrapolation


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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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