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"If time travel is possible", therefore... what?
Following Nick Bostrom's "simulation argument" formulation ( Simulation hypothesis ), the "time traveling argument" could be expressed like that:
If in the universe time traveling is possible, then modifying the past is also possible, then creating new branches of time is also possible, then at least 1 of the following propositions have to be true:
So if 3) is true,
Also published at: https://www.quora.com/If-time-travel-is-possible-does-it-mean-it-has-already-been-used/answer/Thomas-Godart