Full Idea
Negative facts appear to be supervenient upon the positive facts, which suggests that they are nothing more than the positive facts.
Gist of Idea
Negative facts are supervenient on positive facts, suggesting they are positive facts
Source
David M. Armstrong (What is a Law of Nature? [1983], 10.3)
Book Reference
Armstrong,D.M.: 'What is a Law of Nature?' [CUP 1985], p.144