Full Idea
'Socrates is wise' means that the concurrence sum (Socrates) includes a trope which is a member of the similarity set (Wisdom).
Gist of Idea
'Socrates is wise' means a concurrence sum contains a member of a similarity set
Source
Donald C. Williams (On the Elements of Being: I [1953], p.119)
Book Reference
'Properties', ed/tr. Mellor,D.H. /Oliver,A [OUP 1997], p.119
A Reaction
Resemblance has to be taken as a basic (and presumably unanalysable) concept, which invites Russell's objection (Idea 4441).
Related Idea
Idea 4441 'Resemblance Nominalism' won't work, because the theory treats resemblance itself as a universal [Russell]