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
VII 89
Extensionality/Quine: ((x < y ) > ((y < x) > (x = y)) - i.e. a class is determined by its elements - (s) If x and y are subsets of each other, then they are the identical).
IX 22
Extensionality axiom/EA (= E law)/Quine: classes that are consistent in their elements are equal - "x(x e y u x e z) > y = z - Abbreviation for "x(x e y u x e z) u (y e x z e x)] - Problem:> Individuals.
IX 25
Extensionality axiom/Quine: (according to new identity definition: (y = z u y e w) > z e w.
IX 178
Extensionality/Quine: is that what distinguishes attributes from classes - two attributes can be of different order and, therefore, certainly different, and yet be applied to the things, e.g. the attribute "j(j^x jy) where "j" has the order 1, an attribute solely of y - E.g. attribute "c(c^x cy), where "c" has the order 2, again an attribute solely of y, but one of the attributes has the order 2, the other has the order 3.

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.

W.V.O. Quine
Wort und Gegenstand Stuttgart 1980

W.V.O. Quine
Theorien und Dinge Frankfurt 1985

W.V.O. Quine
Grundzüge der Logik Frankfurt 1978

W.V.O. Quine
Mengenlehre und ihre Logik Wiesbaden 1967

W.V.O. Quine
Die Wurzeln der Referenz Frankfurt 1989

W.V.O. Quine
Unterwegs zur Wahrheit Paderborn 1995

W.V.O. Quine
From a logical point of view Cambridge, Mass. 1953

W.V.O. Quine
Bezeichnung und Referenz
Zur Philosophie der idealen Sprache, J. Sinnreich (Hg), München 1982

W.V.O. Quine
Philosophie der Logik Bamberg 2005

W.V.O. Quine
Ontologische Relativität Frankfurt 2003

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Ed. Martin Schulz, access date 2017-09-26