I don't think time travel paradoxes are possible
Posted: Posted August 25th, 2017 by Xhin
If you go back in time you're basically just altering reality at that point so that someone with your memories appears from nothing.
Anything that person does doesn't really matter because reality has already been altered and the time when the person traveled back in time has been erased. It might happen again, it might not.
Also the person that appears at some point in the past isn't causally related to that person in the future where they deparated. From the universe's perspective they were created from nothing with a bunch of future memories intact. The future event (using the time machine) didn't cause that person to appear in the past, and in fact that future event may not actually happen.
Furthermore, the person that appeared in the past is very unlikely to actually be the same person as the person in the future. If separate timelines are a thing (and this is kind of showing how they're not in any meaningful way), then from the perspective of the alternate timeline the time traveler actually died and vanished into nothing.
If there aren't alternate timelines, then the point is moot because the future event may not happen, depending on the actions of the person who instantaneously appeared in the past.
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