Does the idea of half and full have any program to periods? Lewis argues that it does, and that the smallest components of any classification are its one-membered "singleton" subclasses. That leads to a reconception of set idea. The set-theoretical making of 1 out of many is simply the composition of 1 complete out of many elements. yet first, one singleton has to be produced from its one member - this can be the distinctively set-theoretical primitive operation. hence set conception is entangled, with mereology: the speculation of components and wholes.
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