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Single Idea 9582

[filed under theme 6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / e. Counting by correlation ]

Full Idea

When Husserl says that sameness of number can be shown by one-one correlation, he forgets that this counting itself rests on a univocal one-one correlation, namely that between the numerals 1 to n and the objects of the set.

Clarification

'Univocal' means having only one meaning

Gist of Idea

Husserl rests sameness of number on one-one correlation, forgetting the correlation with numbers themselves

Source

Gottlob Frege (Review of Husserl's 'Phil of Arithmetic' [1894], p.326)

Book Ref

-: 'Mind July 1972' [-], p.326


A Reaction

This is the platonist talking. Neo-logicism is attempting to build numbers just from the one-one correlation of objects.


The 15 ideas from 'Review of Husserl's 'Phil of Arithmetic''

A definition need not capture the sense of an expression - just get the reference right [Frege, by Dummett]
Counting rests on one-one correspondence, of numerals to objects [Frege]
The naïve view of number is that it is like a heap of things, or maybe a property of a heap [Frege]
If objects are just presentation, we get increasing abstraction by ignoring their properties [Frege]
Our concepts recognise existing relations, they don't change them [Frege]
Disregarding properties of two cats still leaves different objects, but what is now the difference? [Frege]
Many people have the same thought, which is the component, not the private presentation [Frege]
Husserl rests sameness of number on one-one correlation, forgetting the correlation with numbers themselves [Frege]
Psychological logicians are concerned with sense of words, but mathematicians study the reference [Frege]
Identity baffles psychologists, since A and B must be presented differently to identify them [Frege]
Since every definition is an equation, one cannot define equality itself [Frege]
In a number-statement, something is predicated of a concept [Frege]
How do you find the right level of inattention; you eliminate too many or too few characteristics [Frege]
Number-abstraction somehow makes things identical without changing them! [Frege]
Numbers are not real like the sea, but (crucially) they are still objective [Frege]