Metaphysics
Do general kinds, properties, or forms exist beyond the particular things that instantiate them?
Universals are real Forms, more stable and intelligible than the changing particulars that participate in them.
Forms are real, but they are immanent in substances rather than separated into another realm.
Medieval realism defends the mind-independent reality of universals in some form.
Only particulars exist; universals are names, signs, or conceptual tools.
The issue is recast through predication, reference, abstract objects, and the logic of properties.
The problem of universals asks why many distinct things can be called by one name or understood under one concept. It connects ancient metaphysics, medieval debates, and contemporary work on language and ontology.
The dispute is a pressure point for the whole map: it divides schools by what they think concepts answer to.