more from this thinker
|
more from this text
Single Idea 14362
[filed under theme 9. Objects / F. Identity among Objects / 3. Relative Identity
]
Full Idea
Wiggins argues that Geach's Relative Identity is incompatible with the formal properties of identity, which include, besides transitivity, symmetry and reflexivity, the complete community of properties defined by the Indiscernibility of Identicals.
Clarification
The Indiscernibility of Identicals is often called Leibniz's Law
Gist of Idea
Relative Identity is incompatible with the Indiscernibility of Identicals
Source
report of David Wiggins (Sameness and Substance Renewed [2001]) by Peter F. Strawson - Review of 'Sameness and Substance' p.603
Book Ref
-: 'Mind' [-], p.603
A Reaction
The tricky part is that Wiggins then goes on to say that identity depends on sortals, which sounds very close to the Geach view. I find disentangling them tricky. See Idea 14363 for a helpful comment from Strawson.
Related Idea
Idea 14363
Identity a=b is only possible with some concept to give persistence and existence conditions [Wiggins, by Strawson,P]
The
18 ideas
with the same theme
[identity can only ever be in respect of some feature]:
16794
|
As an infant, Socrates was not the same body, but he was the same human being
[Hobbes]
|
16795
|
Same person, man or substance are different identities, belonging to different ideas
[Locke]
|
12153
|
Geach denies Frege's view, that 'being the same F' splits into being the same and being F
[Perry on Frege]
|
17653
|
Things can only be judged the 'same' by citing some respect of sameness
[Goodman]
|
16075
|
Denial of absolute identity has drastic implications for logic, semantics and set theory
[Wasserman on Geach]
|
12152
|
Identity is relative. One must not say things are 'the same', but 'the same A as'
[Geach]
|
17512
|
If diachronic identities need covering concepts, why not synchronic identities too?
[Ayers]
|
13953
|
An act of ostension doesn't seem to need a 'sort' of thing, even of a very broad kind
[Cartwright,R]
|
12155
|
Statements of 'relative identity' are really statements of resemblance
[Perry]
|
14362
|
Relative Identity is incompatible with the Indiscernibility of Identicals
[Wiggins, by Strawson,P]
|
11838
|
Relativity of Identity makes identity entirely depend on a category
[Wiggins]
|
11847
|
To identify two items, we must have a common sort for them
[Wiggins]
|
14755
|
Gallois is committed to identity with respect to times, and denial of simple identity
[Gallois, by Sider]
|
8305
|
A clear idea of the kind of an object must precede a criterion of identity for it
[Lowe]
|
10321
|
We sometimes apply identity without having a real criterion
[Hale]
|
15185
|
We aren't clear about 'same stuff as this', so a principle of individuation is needed to identify it
[Sidelle]
|
4640
|
If identity is based on 'true of X' instead of 'property of X' we get the Masked Man fallacy ('I know X but not Y')
[Baggini /Fosl, by PG]
|
16074
|
Relative identity may reject transitivity, but that suggests that it isn't about 'identity'
[Wasserman]
|