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Neither Is You, Because You Don't Exist
There's no fact in other possible worlds about which thing there is really you. Neither is you, because you don't exist. If identity is just a matter of decision, then why can't twins in real life just decide to be the other one? In fact, actual identical twins make David lewis's case even better. I see twins every day at the bus stop. Let's call them a and b. Like all identical twins, a and b are split from an original zigot. But in the possible world where it never split and it develops into only one person, is that person a, or is that person b? There no answer.