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Что (кто) такое extensionality - определение
LOGIC PRINCIPLE THAT JUDGES OBJECTS TO BE EQUAL IF THEY HAVE THE SAME EXTERNAL PROPERTIES
Extensional equality; Extensional relation; Extensional relations
extensionality
Extensionality
In logic, extensionality, or extensional equality, refers to principles that judge objects to be equal if they have the same external properties. It stands in contrast to the concept of intensionality, which is concerned with whether the internal definitions of objects are the same.
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.
Википедия
Extensionality
In logic, extensionality, or extensional equality, refers to principles that judge objects to be equal if they have the same external properties. It stands in contrast to the concept of intensionality, which is concerned with whether the internal definitions of objects are the same.
