6.1 Transworld identity and counterpart theory
David Lewis's extreme realism about the nature of possible worlds. The problems in question do not arise directly from the notion of an individual's existing in more than one possible world with different properties. Rather, they derive principally from the fact that it is hard to accommodate all the things that we want to say about the modal properties of ordinary individuals (including all the things that we want to say about their essential and accidental properties) if de re modal statements about such individuals are characterized in terms of their existence or non-existence in other possible worlds.
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