Full Idea
No clear explanation of the idea that the conclusion was 'implicitly contained in' the premises was ever given, and I do not believe that any clear explanation is possible.
Gist of Idea
It seems impossible to explain the idea that the conclusion is contained in the premises
Source
Hartry Field (Science without Numbers [1980], 1)
Book Reference
Field,Hartry: 'Science without Number' [Blackwell 1980], p.16