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Single Idea 6043
[filed under theme 9. Objects / F. Identity among Objects / 4. Type Identity
]
Full Idea
Two things are said to be type-identical when they are similar enough to be declared qualitatively identical.
Gist of Idea
Type-identity is close similarity in qualities
Source
Colin McGinn (Logical Properties [2000], Ch.1)
Book Ref
McGinn,Colin: 'Logical Properties' [OUP 2003], p.2
A Reaction
A simple point which brings out the fact that type-identity is unlikely to be any sort of true identity (unless there is absolutely no different at all between two electrons, say).
The
40 ideas
from 'Logical Properties'
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6042
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The quantifier is overrated as an analytical tool
[McGinn]
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6051
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In 'x is F and x is G' we must assume the identity of x in the two statements
[McGinn]
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6055
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Both non-contradiction and excluded middle need identity in their formulation
[McGinn]
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6059
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Identity is unitary, indefinable, fundamental and a genuine relation
[McGinn]
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6053
|
Identity is as basic as any concept could ever be
[McGinn]
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6052
|
Definitions identify two concepts, so they presuppose identity
[McGinn]
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6043
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Type-identity is close similarity in qualities
[McGinn]
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6044
|
Qualitative identity is really numerical identity of properties
[McGinn]
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6046
|
Qualitative identity can be analysed into numerical identity of the type involved
[McGinn]
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6058
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Identity propositions are not always tautological, and have a key epistemic role
[McGinn]
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6054
|
Sherlock Holmes does not exist, but he is self-identical
[McGinn]
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6050
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Leibniz's Law presupposes the notion of property identity
[McGinn]
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6049
|
Leibniz's Law says 'x = y iff for all P, Px iff Py'
[McGinn]
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6045
|
It is best to drop types of identity, and speak of 'identity' or 'resemblance'
[McGinn]
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6047
|
All identity is necessary, though identity statements can be contingently true
[McGinn]
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6048
|
Leibniz's Law is so fundamental that it almost defines the concept of identity
[McGinn]
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|
6071
|
Scepticism about reality is possible because existence isn't part of appearances
[McGinn]
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6072
|
If Satan is the most imperfect conceivable being, he must have non-existence
[McGinn]
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6073
|
I think the fault of the Ontological Argument is taking the original idea to be well-defined
[McGinn]
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6066
|
Existence is a property of all objects, but less universal than self-identity, which covers even conceivable objects
[McGinn]
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6062
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Existence can't be analysed as instantiating a property, as instantiation requires existence
[McGinn]
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|
6065
|
We can't analyse the sentence 'something exists' in terms of instantiated properties
[McGinn]
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6067
|
Existential quantifiers just express the quantity of things, leaving existence to the predicate 'exists'
[McGinn]
|
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6069
|
'Partial quantifier' would be a better name than 'existential quantifier', as no existence would be implied
[McGinn]
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6068
|
We need an Intentional Quantifier ("some of the things we talk about.."), so existence goes into the proposition
[McGinn]
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6064
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Regresses are only vicious in the context of an explanation
[McGinn]
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6070
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Existence is a primary quality, non-existence a secondary quality
[McGinn]
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6075
|
Facts are object-plus-extension, or property-plus-set-of-properties, or object-plus-property
[McGinn]
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6074
|
Clearly predicates have extensions (applicable objects), but are the extensions part of their meaning?
[McGinn]
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6077
|
Semantics should not be based on set-membership, but on instantiation of properties in objects
[McGinn]
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6080
|
Modality is not objects or properties, but the type of binding of objects to properties
[McGinn]
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6079
|
If 'possible' is explained as quantification across worlds, there must be possible worlds
[McGinn]
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6082
|
If causal power is the test for reality, that will exclude necessities and possibilities
[McGinn]
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6081
|
Necessity and possibility are big threats to the empiricist view of knowledge
[McGinn]
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6088
|
Truth is a method of deducing facts from propositions
[McGinn]
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6083
|
The coherence theory of truth implies idealism, because facts are just coherent beliefs
[McGinn]
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6084
|
'Snow does not fall' corresponds to snow does fall
[McGinn]
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6085
|
The idea of truth is built into the idea of correspondence
[McGinn]
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6086
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Truth is the property of propositions that makes it possible to deduce facts
[McGinn]
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6087
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Without the disquotation device for truth, you could never form beliefs from others' testimony
[McGinn]
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