Jonathan SchafferPhillip BrickerLynne Rudder BakerBohn, Einar2024-04-262024-04-262009-0910.7275/f4zq-r707https://hdl.handle.net/20.500.14394/39315In this work I first develop, motivate, and defend the view that mereological composition, the relation between an object and all its parts collectively, is a relation of identity. I argue that this view implies and hence can explain the logical necessity of classical mereology, the formal study of the part-whole relation. I then critically discuss four contemporary views of the same kind. Finally, I employ my thesis in a recent discussion of whether the world is fundamentally one in number.CompositionMereologyOntologyPhilosophical LogicPhilosophydissertation