(“Real” in the usual sense, i.e. can reliably be used to coordinate with other agents.)
With respect to e.g. bringing back all of the dead at least it doesn’t seem to matter: there are lots of histories consistent with your memories, some of them aren’t consistent with your ‘real’ history, but (at least if we have appropriate philosophical views towards our prior and so on) each of these histories also leads to an agent in your current situation, so if each one of them guesses the same distribution you end up with the same guesses as if each had been informed of their “real” history. With respect to uncomputing the universe I agree that you can’t recover all of the negentropy, but you do seem to recover perfect info in the relevant sense and in such universes you have infinitely much stuff anyway.
Okay, I understand now; I was thinking about the problem of reversing the past. Your arguments make sense if you just want to resurrect folk; it’s possible (as you seem to think?) that there’s no particularly good reason to reverse the past as long you have tons of computing power and all the information about the past that you’d need in practice. It’s definitely true that the latter strategy is applicable in more possible universes.
With respect to e.g. bringing back all of the dead at least it doesn’t seem to matter: there are lots of histories consistent with your memories, some of them aren’t consistent with your ‘real’ history, but (at least if we have appropriate philosophical views towards our prior and so on) each of these histories also leads to an agent in your current situation, so if each one of them guesses the same distribution you end up with the same guesses as if each had been informed of their “real” history. With respect to uncomputing the universe I agree that you can’t recover all of the negentropy, but you do seem to recover perfect info in the relevant sense and in such universes you have infinitely much stuff anyway.
Okay, I understand now; I was thinking about the problem of reversing the past. Your arguments make sense if you just want to resurrect folk; it’s possible (as you seem to think?) that there’s no particularly good reason to reverse the past as long you have tons of computing power and all the information about the past that you’d need in practice. It’s definitely true that the latter strategy is applicable in more possible universes.