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shminux comments on Harry Potter and the Methods of Rationality discussion thread, part 16, chapter 85 - Less Wrong
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The time turner remembers its worldline and jumps back along it, in a perfectly relativistically invariant way.
That's perfectly well defined, but you also wind up inside yourself 6 hours ago, which is an issue.
That's not your original objection! Also, my model (elsewhere in this thread) defines time-turners as world-splitters, which avoids the time loops.
I'm not saying it's my original objection, it's a new one. It's addressed by having them be world splitters, but I didn't know you had posted about that elsewhere.