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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I 92
Extensional Semantics: E.g. assumend everyone who sings dances, and vice versa - then there can be an interpretation that attributes "sings" to the dancers and "dancing" to the singers - everyone who believes that Cicero sings, must according to this interpretation also believe that he dances - but he must, of course, do not really believe it - solution/Davidson: "x is a singing and x is of a" - but not "x’ F-being" without x is an F. ((s) uninstantiated).

Cr I
M. J. Cresswell
Semantical Essays (Possible worlds and their rivals) Dordrecht Boston 1988

M. J. Cresswell
Structured Meanings Cambridge Mass. 1984

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Ed. Martin Schulz, access date 2017-05-23