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spatiotemporal relations / Stalnaker: are irreducible - they play a crucial role in metaphysical theories - because they are the ones with whom we individuate possible worlds.
Individuation / possible worlds / Stalnaker: worlds are individuated by space-time relations. Various worlds can be very different systems of spatial and temporal relations. - ((s) If they had to be the same, we could not distinguish different worlds with their help.) - Individuation / ((s): must allow diversity.)
Ways a World may be Oxford New York 2003