resemblance nominalism

Resemblance nominalism is a philosophical stance that addresses the nature of universals. Instead of positing abstract universals, it suggests that things share properties because they resemble each other. This view attempts to explain how different objects can be categorized together, such as multiple red objects, by focusing on their shared characteristics rather than an abstract "redness".1

However, resemblance nominalism faces challenges. One significant problem is the "companionship problem," where two distinct properties might always occur together, leading to the incorrect identification of a single property. Another issue is the "imperfect community" problem, where members of a class resemble each other to a high degree, but there isn't one single respect in which they all do, making it difficult to define a shared property.2