Full Idea
Nihilism about objects says there is a Y such that the Xs compose it if and only if there is only one of the Xs.
Gist of Idea
Nihilism says composition between single things is impossible
Source
Peter van Inwagen (Material Beings [1990], 08)
Book Reference
Inwagen,Peter van: 'Material Beings' [Cornell 1995], p.72
A Reaction
He says that Unger, the best known 'nihilist' about objects, believes a different version - claiming there are composites, but they never make up the ordinary objects we talk about.