Full Idea
One view of instantiation is that it is the set-membership predicate.
Gist of Idea
Instantiation is set-membership
Source
Alex Oliver (The Metaphysics of Properties [1996], §10)
Book Reference
-: 'Mind' [-], p.21
A Reaction
This cuts the Gordian knot rather nicely, but I don't like it, if the view of sets is extensional. We need to account for natural properties, and we need to exclude mere 'categorial' properties.