Full Idea
Frege put forward an ontological argument for the existence of numbers.
Gist of Idea
Frege put forward an ontological argument for the existence of numbers
Source
report of Gottlob Frege (works [1890]) by José A. Benardete - Metaphysics: the logical approach Ch.4
Book Reference
Benardete,José A.: 'Metaphysics: The Logical Approach' [OUP 1989], p.21