Full Idea
My thesis C says that to specify something or other under which a and b coincide is to specify a concept f which qualifies for this purpose only if it yields a principle of counting for fs. ...I submit that C is false, though a near miss.
Gist of Idea
Maybe the concept needed under which things coincide must also yield a principle of counting
Source
David Wiggins (Sameness and Substance [1980], 1.1)
Book Reference
Wiggins,David: 'Sameness and Substance' [Blackwell 1980], p.18