Psychology Dictionary of Arguments

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Intensions: intensions are reference objects resulting from a linguistic description, in contrast to the material objects (extensions) that may differ therefore, whether due to inaccuracies, or by the use of indexical expressions. Examples of intensions are “the oldest person in the room”, “the winner”, “John's favorite quote”, “the one who violates the speed limit”. See also morning star/evening star, extensionality, extension.

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

Ludwig Wittgenstein on Intensions - Dictionary of Arguments

II 343
Intension/classes/quantities/Frege/Russell/WittgensteinVsRussell/WittgensteinVsFrege: both believed they could deal with the classes intensionally because they thought they could turn a list into a property, a function. >Set theory.
II 416
Intension/extension/Mathematics/Wittgenstein: in everyday language intension and extension are not interchangeable - E.g. I hate the man in the chair - I hate Mr. Schmitz - on the other hand in mathematics: here, there is no difference between "the roots of the equation x² + 2x + 1 = 0 and "2"- in contrast difference: counting bodies ((s) extension, also writing down) is something different than to determine them with a law ((s) intension) - Wittgenstein: law and extension are completely different - ((s) >Physics). >Equations, >Mathematics.
III 136-139
Elementary PropositionVsIntension - (protection of formal logic) - intension/meaning/Tractatus/Flor: irrelevant - it is always about extension. >Extension, >Meaning, >Propositions.

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.

L. Wittgenstein
Wittgenstein’s Lectures 1930-32, from the notes of John King and Desmond Lee, Oxford 1980
German Edition:
Vorlesungen 1930-35 Frankfurt 1989

L. Wittgenstein
The Blue and Brown Books (BB), Oxford 1958
German Edition:
Das Blaue Buch - Eine Philosophische Betrachtung Frankfurt 1984

L. Wittgenstein
Tractatus Logico-Philosophicus (TLP), 1922, C.K. Ogden (trans.), London: Routledge & Kegan Paul. Originally published as “Logisch-Philosophische Abhandlung”, in Annalen der Naturphilosophische, XIV (3/4), 1921.
German Edition:
Tractatus logico-philosophicus Frankfurt/M 1960

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