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Psychology Dictionary of Arguments

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Extension, philosophy: an object, for example, the planet Venus as a material body, independent from the manner in which it is singled out. In contrast, intension is the way in which the object is given or is represented, e.g. Morning star or Evening star. See also intensions, identity, identity conditions, reference, meaning, assertibility conditions, propositional attitudes, opacity.
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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

Rudolf Carnap on Extensions - Dictionary of Arguments

VI 59
Extensional/Carnap: E.g. "The class of humans is contained in the class of mortals" - pseudo-intensional: "x is mortal".
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Newen I 28
Def Extension/Carnap: from singular terms: the object.
Extension of sentence/sentence extension: the truth value. >Truth value.
Extension of predicate: single-digit: set of objects with the corresponding property
two-digit: set of pairs, etc.
Def Intension/Carnap: information content of the sentence - set of possible worlds where the corresponding sentence is true.
Individual Concept/Carnap: intension pf a description. >Descriptions
, >Intensions.
I 30
Hyper-Intensionality: Problem: necessarily true or false sentences are true or false in the same sets of possible worlds. - Hence there is an indistinguishable when we use possible world semantics. >Indiscernibility, >Indistinguishability.

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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.

Ca I
R. Carnap
Die alte und die neue Logik
In
Wahrheitstheorien, G. Skirbekk (Hg), Frankfurt 1996

Ca II
R. Carnap
Philosophie als logische Syntax
In
Philosophie im 20.Jahrhundert, Bd II, A. Hügli/P.Lübcke (Hg), Reinbek 1993

Ca IV
R. Carnap
Mein Weg in die Philosophie Stuttgart 1992

Ca IX
Rudolf Carnap
Wahrheit und Bewährung. Actes du Congrès International de Philosophie Scientifique fasc. 4, Induction et Probabilité, Paris, 1936
In
Wahrheitstheorien, Gunnar Skirbekk, Frankfurt/M. 1977

Ca VI
R. Carnap
Der Logische Aufbau der Welt Hamburg 1998

CA VII = PiS
R. Carnap
Sinn und Synonymität in natürlichen Sprachen
In
Zur Philosophie der idealen Sprache, J. Sinnreich (Hg), München 1982

Ca VIII (= PiS)
R. Carnap
Über einige Begriffe der Pragmatik
In
Zur Philosophie der idealen Sprache, J. Sinnreich (Hg), München 1982

New II
Albert Newen
Analytische Philosophie zur Einführung Hamburg 2005

Newen I
Albert Newen
Markus Schrenk
Einführung in die Sprachphilosophie Darmstadt 2008


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