Psychology Dictionary of Arguments

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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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Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.

 
Author Concept Summary/Quotes Sources

Maxwell J. Cresswell on Extensionality - Dictionary of Arguments

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) This is uninstantiated).
>Predication
, >Attribution, >Quantification, >Intensions.

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Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. Translations: Dictionary of Arguments
The note [Concept/Author], [Author1]Vs[Author2] or [Author]Vs[term] resp. "problem:"/"solution:", "old:"/"new:" and "thesis:" is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition.

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

Cr II
M. J. Cresswell
Structured Meanings Cambridge Mass. 1984


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