Philosophy Lexicon of Arguments

Extensionality, philosophy: (also extensionality principle, extensionality thesis) an attempt to make the language distinct by taking complete sets of denoted objects as the meaning of the referring words. See also extensions, intensions, extensional language, ambiguity, propositional attitudes.
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IV 62
Def Extensionality problem/Fodor/Lepore: the problem that a meaning theory can not only be postulated only from the set of truth sentences of a truth theory, as extensional adequacy is not enough (Problem: the equivalence of "Snow is white" and "Grass is green") - Solution: material instead of extensional adequacy, >translation) - problem: what is a "translation"? - IV 63 Truth theory must be able to recognize the truth conditions so that the left side he interprets the right one - problem also with compositionality: from the equivalence of "Snow is white" and "Grass is green" arise false truth conditions.

J. Fodor/E. Lepore
Holism Cambridge USA Oxford UK 1992

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Ed. Martin Schulz, access date 2017-05-30