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Single Idea 10549

[filed under theme 18. Thought / E. Abstraction / 7. Abstracta by Equivalence ]

Full Idea

Since we cannot pick an abstract object out from its surrounding, all that we need to master is the use of statements of identity between objects of a certain kind.

Gist of Idea

Since abstract objects cannot be picked out, we must rely on identity statements

Source

Michael Dummett (Frege Philosophy of Language (2nd ed) [1973], Ch.14)

Book Ref

Dummett,Michael: 'Frege Philosophy of Language' [Duckworth 1981], p.498

A Reaction

This is the necessary Fregean preliminary to using a principle of abstraction to identify two objects which are abstract (when the two objects are in an equivalence relation). Presumably circular squares and square circles are identical?

The 23 ideas from 'Frege Philosophy of Language (2nd ed)'

10320 If a genuine singular term needs a criterion of identity, we must exclude abstract nouns [Dummett, by Hale]
19168 Concepts only have a 'functional character', because they map to truth values, not objects [Dummett, by Davidson]
10549 Since abstract objects cannot be picked out, we must rely on identity statements [Dummett]
10516 A realistic view of reference is possible for concrete objects, but not for abstract objects [Dummett, by Hale]
10547 Abstract objects can never be confronted, and need verbal phrases for reference [Dummett]
10531 There is a modern philosophical notion of 'object', first introduced by Frege [Dummett]
17621 What matters in mathematics is its objectivity, not the existence of the objects [Dummett]
10537 The ordered pairs <x,y> can be reduced to the class of sets of the form {{x},{x,y}} [Dummett]
10542 To associate a cardinal with each set, we need the Axiom of Choice to find a representative [Dummett]
10554 Intuitionists find the Incompleteness Theorem unsurprising, since proof is intuitive, not formal [Dummett]
10540 We can't say that light is concrete but radio waves abstract [Dummett]
10552 Intuitionism says that totality of numbers is only potential, but is still determinate [Dummett]
10515 Ostension is possible for concreta; abstracta can only be referred to via other objects [Dummett, by Hale]
10544 The concrete/abstract distinction seems crude: in which category is the Mistral? [Dummett]
10546 We don't need a sharp concrete/abstract distinction [Dummett]
10548 The context principle for names rules out a special philosophical sense for 'existence' [Dummett]
10281 The objects we recognise the world as containing depends on the structure of our language [Dummett]
10532 We can understand universals by studying predication [Dummett]
10534 'Nominalism' used to mean denial of universals, but now means denial of abstract objects [Dummett]
10545 Abstract objects may not cause changes, but they can be the subject of change [Dummett]
10541 Concrete objects such as sounds and smells may not be possible objects of ostension [Dummett]
10555 If we can intuitively apprehend abstract objects, this makes them observable and causally active [Dummett]
10543 Abstract objects must have names that fall within the range of some functional expression [Dummett]