|Identity: Two objects are never identical. Identity is a single object, to which may be referred to with two different terms. The fact that two descriptions mean a single object may be discovered only in the course of an investigation._____________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. |
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Identity/GeachVsFrege: is not a relation - "Is an A" does not mean "has identity with A" - (whereby "A" is a name). - VsFrege: (in Frege, basic principles of artihmetics) instead of "There are just as many Fs as Gs": "Either any given object F iff it is a G, or there is a relation that is a one-to-one correspondence between the Fs and Gs". But this must not be an identity.
Identity/Geach: only objects can be strictly identical. - In terms, there is only analogous identity: if they are coextensive.
Identity/GeachVsQuine: Thesis: Identity is relative. - If someone says "x is identical to y", this is an incomplete expression. - It is an abbreviation for "x is the same as y". - (Weird, that Frege did not represent this).
Identity/tradition/Geach: can be expressed by a single schema.
(1)l- Fa (x)(Fx u x = a) - everyday-language: whatever is true of something which is identical with an object y is true of a and vice versa. - From this we derive the law of self-identity:
"l-a = a".
Because we take "Fx" for "x unequal a", then schema (1) gives us:
(2)l- (a unequal a) Vx(y unequal a u x = a) - this,of course, gives "l-a = a"
Identity/Geach: if we demand strict identity, regardless of the theory in which we move, we get into the semantic paradoxes such as Grelling's or Richard's solution: relative identity on theory or language, indissibility/"indiscernibility"/Quine -> Partial identity.
Tugendhat I 37
Identity/Dummett/Geach: "=" can only be used with reference to objects.
- - -
Habermas IV 158
Identity/Geach/Habermas: Peter Geach argues that identity predicates can only be used meaningfully in connection with the general characterization of a class of objects. (1) (See also Criteria/Henrich, HenrichVsGeach).
E.g. Person/Identification/Habermas: Persons cannot be identified under the same conditions as observable objects. In the case of persons, spatiotemporal identification is not sufficient.
1.P.Geach, Ontological Relativity and Relative Identity, in: K. Munitz, Logic and Ontology, NY. 1973_____________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.
Logic Matters Oxford 1972
Vorlesungen zur Einführung in die Sprachanalytische Philosophie Frankfurt 1976
Philosophische Aufsätze Frankfurt 1992
Der philosophische Diskurs der Moderne Frankfurt 1988
Theorie des kommunikativen Handelns Bd. I Frankfurt/M. 1981
Theorie des kommunikativen Handelns Bd. II Frankfurt/M. 1981