Abstract

In David Lewis’s famous ‘Many, but Almost One’, he argues that when objects of the same kind share most of their parts, they can be counted as one. I argue that mereological overlap does not do the trick. A better candidate is overlap in function. Although mereological overlap often goes hand-in-hand with functional overlap, a functional approach is more accurate in cases in which mereology and function are teased apart. A functional approach also solves a version of the problem of the many that Lewis thought was immune to the Almost-One solution