Full Idea
The iterative conception of set was not so much as suggested, let alone advocated by anyone, until 1947.
Gist of Idea
The iterative conception of set wasn't suggested until 1947
Source
Shaughan Lavine (Understanding the Infinite [1994], I)
Book Reference
Lavine,Shaughan: 'Understanding the Infinite' [Harvard 1994], p.5