Full Idea
Von Neumann defines each number as the set of all smaller numbers.
Gist of Idea
Von Neumann defines each number as the set of all smaller numbers
Source
report of John von Neumann (works [1935]) by Simon Blackburn - Oxford Dictionary of Philosophy p.280
Book Reference
Benardete,José A.: 'Metaphysics: The Logical Approach' [OUP 1989], p.280