In possible worlds Counterpart theory
1 in possible worlds 1.1 overlapping individuals 1.2 trans-world individuals 1.3 haecceity in possible worlds david lewis defended modal realism. view possible world concrete, maximal connected spatio-temporal region. actual world 1 of possible worlds; concrete. because single concrete object demands spatio-temporal connectedness, possible concrete object can exist in 1 possible world. still, true things like: possible hubert humphrey won 1968 presidential election. how true? humphrey has counterpart in possible world wins 1968 election in world. lewis argues against 3 other alternatives might compatible possibilism: overlapping individuals, trans-world individuals, , haecceity. some philosophers, such peter van inwagen (1985), see no problem identity within world . lewis seems share attitude. says: … holy roman empire, badly named. […] in first place should bear in mind trans-world airlines intercontinental, not yet interplanetary carrier. more important, should not suppose have here...