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Full Idea
Contrary to Dedekind's anti-realism, Frege proposed a realist definition of a set as the extension of a predicate (or concept, or function).
Clarification
The 'extension' of the set is the actual things which the set contains (e.g. trees); hence he must accept real trees
Gist of Idea
Frege proposed a realist concept of a set, as the extension of a predicate or concept or function
Source
report of Gottlob Frege (works [1890]) by José A. Benardete - Metaphysics: the logical approach Ch.13
Book Ref
Benardete,José A.: 'Metaphysics: The Logical Approach' [OUP 1989], p.91
9834 | A class is, for Frege, the extension of a concept [Frege, by Dummett] |
3328 | Frege proposed a realist concept of a set, as the extension of a predicate or concept or function [Frege, by Benardete,JA] |
21563 | The 'no classes' theory says the propositions just refer to the members [Russell] |
14461 | Propositions about classes can be reduced to propositions about their defining functions [Russell] |
11020 | Realisms like the full Comprehension Principle, that all good concepts determine sets [Read] |
15919 | The 'logical' notion of class has some kind of definition or rule to characterise the class [Lavine] |