Endurantist accounts of persistence rely on relations to times, but time travel generates a branching external time versus personal time distinction that undermines standard relational strategies.
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Philosophical approaches that explain how something works by describing its relationships to other things, rather than describing it in isolation.
Time travel(the main subject being discussed)
The hypothetical ability to move through time in a way that doesn't match normal experience—like skipping ahead, going backward, or experiencing time at a different speed than everyone else.
persistence(Weyl's distinction between two kinds of constancy)
Constancy maintained because a quantity is isolated and undisturbed, as opposed to actively adjusted