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.

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 Item Excerpt Meta data

Books on Amazon:
Bertrand Russell
I XXXII (Note)
Def Extensionality principle: no two different properties can belong to exactly the same thing ((s) but only intensional - "great man"/"fat man" may be the same, just different intensions (therefore just no properties)) - I XVI Def intentionality principle: to different definitions belong different terms - Def vicious circle principle / Russell: no totality can contain members that can be defined only in terms of this totality, or members which comprise this totality or presuppose it.

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.

B. Russell/A.N. Whitehead
Principia Mathematica Frankfurt 1986

B. Russell
Das ABC der Relativitätstheorie Frankfurt 1989

B. Russell
Probleme der Philosophie Frankfurt 1967

B. Russell
Die Philosophie des logischen Atomismus
Eigennamen, U. Wolf (Hg), Frankfurt 1993

B. Russell
Wahrheit und Falschheit
Wahrheitstheorien, G. Skirbekk (Hg), Frankfurt 1996

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Ed. Martin Schulz, access date 2017-06-26