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Just as set theory can be divorced from Ernst Zermelo's original axiomatization of it, counterpart theory can be divorced from the eight postulates that were originally stipulated by David Lewis (1968, p. 114) to constitute it. These were postulates governing some of the properties and relations holding among possible worlds and their inhabitants. In particular, counterpart theory can be divorced from Lewis's postulate P2, the stipulation that individuals are ‘world bound’—that none exists in more than one possible world


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