Full Idea
For a Class Nominalist 'the class of all 4-kilo objects' is the truthmaker for the truth that the particular has just that mass. Yet this looks far too big! Would not the object still be four kilos even if the other members of the class had never existed?
Gist of Idea
The class of similar things is much too big a truthmaker for the feature of a particular
Source
David M. Armstrong (Truth and Truthmakers [2004], 04.2)
Book Reference
Armstrong,D.M.: 'Truth and Truthmakers' [CUP 2004], p.40
A Reaction
This seems so obvious to me as to be hardly worth saying. To identify redness with the class of red entities just seems crazy. Why do they belong in that class? Armstrong is illustrating the value of the truthmaker idea in philosophy.