Full Idea
The ontologically fundamental categories are three in number: Objects, Properties, and Relations.
Gist of Idea
The three categories in ontology are objects, properties and relations
Source
George Molnar (Powers [1998], 2 Intr)
Book Reference
Molnar,George: 'Powers: a study in metaphysics', ed/tr. Mumford,Stephen [OUP 2003], p.47
A Reaction
We need second-order logic to quantify over all of these. The challenge to this view might be that it is static, and needs the addition of processes or events. Molnar rejects facts and states of affairs.