Condividere una proprietà

'They are carrying a piano': when a single instance of a property is attributed to many things (but not distributively to each thing), what is subject of the property? Much of the current discussion agrees that the subject is not a complex entity such as the set, the collection, or the totality of these things; nor is the property instance divided between the subjects. I examine the historical roots of this debate in Plato, on the metaphysical question of property co-ownership: how can distinct subjects share a single instance of a property between them? I argue against the established philosophical tradition that the solution requires us to distinguish between being a subject and being ontologically unified. The metaphysical function of co-owning a property requires no composition; rather, it is grounded on the properties and activities of each of the several co-owners of the property instance.