Your argument is circular. The only reason that it applies here and not with pranking his past self is that he successfully pranked his past self but didn’t go back in time here. It doesn’t answer the question of why there’s a stable time loop of him pranking himself, but not one of him saving Hermione.
Are you objecting to a time travel argument because it is circular?! Of course it’s circular, it’s time travel. That’s the thing about time travel, it makes causal circles. That’s why it drives you insane to think about it.
Harry got “Do not mess with time” because he was willing, in that case, to send the same message back. If he hadn’t been, he never would have received that message in the first place.
If he had been willing to do that, he wouldn’t have received “do not mess with time”.
Though I notice I’m confused as to how, exactly, the universe can figure out he’d create a paradox in this situation without actually running the computation to see what happens. Probably it can’t. Probably time-travel is hilariously unethical.
The universe isn’t limited to object-level proofs that exist in the universe, I guess. Perhaps the universe has access to the list of everything which is true about the universe?
I don’t. It’s not accessible from the object level, or any combination of first-order meta levels. it takes at least a second-order meta (2°meta:1°meta::1°meta:object) to create such a list, and I can’t even begin to explain what second-order meta means.
Well, I can consider the analogous situation where time travel is repeated in an attempt for Emperor Yingling of Scandinavia to convince all of his respective kingdoms to adopt ultimogeniture secession before he dies, so that his youngest son won’t have to fight secession wars as he tries to expand into Rus while defending Aragorn from upstarts who object to imperial expansion by marriage.
I don’t think that save-scumming is immoral because simulations are dying, although I am receptive to arguments that it is immoral because it breaks the rules.
Given that this universe settled on an explicit message about not messing with time, and given how much magic apparently involves naive mental entities, it seems like anthropomorphizing the laws of physics is a much more useful heuristic in the HP universe than it is in ours.
I was thinking about how I’d implement HPMoR-style time-travel in a turing machine, actually.
It goes something like this:
Compute every possible future that doesn’t contradict something in the fixed past, including loops.
Whenever you find a paradox, delete that timeline.
Repeat.
That would generate a story we could read, no problem. It wouldn’t generate anyone who actually experiences paradoxes, either; to the degree those actually exist, they never get out of the subatomic level. It’s not clear to me whether or not this results in a universe that can usefully be experienced, though, or (more to the point) whether your future experiences match up with the type of experiences you remember.
It’s not entirely obvious what causes a given stable time loop, but that doesn’t mean there is no way to predict it. Even if it’s random, it has to have some kind of probability distribution. Time loops isn’t an excuse for an author to do whatever they want. At least, not if they want it to take place in a universe based on rules and not narrative causality.
I’m asking why he didn’t fail in an attempt to go back in time; it’s obvious that he’s going to try, using every means available to him less insane than assaulting Azkaban single-handedly.
… You can only travel back in time if you’ve already arrived. The mechanism by which the time-turner works is unclear, but if Harry didn’t try and fail to use his time-turner simply because he already hadn’t arrived earlier in time.
You can only travel back in time if you’ve already arrived.
You only travel back in time if you’ve already arrived. I don’t think “can” belongs there. You only travel to New York if you arrive, but you don’t say that you only can travel to New York if you arrive, even though it’s impossible to leave for New York and then disappear into the ether.
The mechanism by which the time-turner works is unclear, but if Harry didn’t try and fail to use his time-turner simply because he already hadn’t arrived earlier in time.
I can’t seem to parse this sentence. Please restate.
We know that Harry won’t successfully use his Time Turner from the fact that he hasn’t arrived in the past, but we don’t know why.
And right now that we only know that Harry’s attempts to travel back in time doesn’t appear to stop Hermione’s death. That could be because for some reason Harry is unable to convince or blackmail Dumbledore and unable to defeat a simple casing despite knowing partial transfiguration, it could be because of an as-yet unstated limitation on the use of time-turners (which would be the bad storytelling trope known as “ass-pull”), or it could be because the same enemy which buffed the troll also takes precautions against counter-turning (for example, by taking meaningless information from 1800, encoding it into the junk DNA of some yeast, and putting the yeast into dinner; I would expect a smart dark wizard to consider something very analogous to this, and it takes a master of stable time loops to go back in time BEFORE eating the food, thwart the troll and save Hermione, then set up a fake troll and fake Hermione so that you can convince the enemy that their plan failed so that they later spend their re-do on attempting to stop yours)
Your argument is circular. The only reason that it applies here and not with pranking his past self is that he successfully pranked his past self but didn’t go back in time here. It doesn’t answer the question of why there’s a stable time loop of him pranking himself, but not one of him saving Hermione.
Are you objecting to a time travel argument because it is circular?! Of course it’s circular, it’s time travel. That’s the thing about time travel, it makes causal circles. That’s why it drives you insane to think about it.
It’s about fixed-point solutions.
Harry got “Do not mess with time” because he was willing, in that case, to send the same message back. If he hadn’t been, he never would have received that message in the first place.
If Harry had been willing to write “101x101” after receiving “do not mess with time”, he would have solved NP=P?
If he had been willing to do that, he wouldn’t have received “do not mess with time”.
Though I notice I’m confused as to how, exactly, the universe can figure out he’d create a paradox in this situation without actually running the computation to see what happens. Probably it can’t. Probably time-travel is hilariously unethical.
The universe isn’t limited to object-level proofs that exist in the universe, I guess. Perhaps the universe has access to the list of everything which is true about the universe?
Well, how do you make that list?
I don’t. It’s not accessible from the object level, or any combination of first-order meta levels. it takes at least a second-order meta (2°meta:1°meta::1°meta:object) to create such a list, and I can’t even begin to explain what second-order meta means.
All right, so long as you realize that means you can’t evaluate whether or not such a thing is possible. :-)
Argument from confusion doesn’t work.
Well, I can consider the analogous situation where time travel is repeated in an attempt for Emperor Yingling of Scandinavia to convince all of his respective kingdoms to adopt ultimogeniture secession before he dies, so that his youngest son won’t have to fight secession wars as he tries to expand into Rus while defending Aragorn from upstarts who object to imperial expansion by marriage.
I don’t think that save-scumming is immoral because simulations are dying, although I am receptive to arguments that it is immoral because it breaks the rules.
I think you’re inappropriately anthropomorphizing the universe.
Given that this universe settled on an explicit message about not messing with time, and given how much magic apparently involves naive mental entities, it seems like anthropomorphizing the laws of physics is a much more useful heuristic in the HP universe than it is in ours.
I was thinking about how I’d implement HPMoR-style time-travel in a turing machine, actually.
It goes something like this:
Compute every possible future that doesn’t contradict something in the fixed past, including loops.
Whenever you find a paradox, delete that timeline.
Repeat.
That would generate a story we could read, no problem. It wouldn’t generate anyone who actually experiences paradoxes, either; to the degree those actually exist, they never get out of the subatomic level. It’s not clear to me whether or not this results in a universe that can usefully be experienced, though, or (more to the point) whether your future experiences match up with the type of experiences you remember.
..kind of odd.
I suspect he would have had an unfortunate encounter with someone else’s stable time loop.
It’s not entirely obvious what causes a given stable time loop, but that doesn’t mean there is no way to predict it. Even if it’s random, it has to have some kind of probability distribution. Time loops isn’t an excuse for an author to do whatever they want. At least, not if they want it to take place in a universe based on rules and not narrative causality.
I’m asking why he didn’t fail in an attempt to go back in time; it’s obvious that he’s going to try, using every means available to him less insane than assaulting Azkaban single-handedly.
It doesn’t look like you were asking anything.
There was some miscommunication here. Please restate your original point.
… You can only travel back in time if you’ve already arrived. The mechanism by which the time-turner works is unclear, but if Harry didn’t try and fail to use his time-turner simply because he already hadn’t arrived earlier in time.
You only travel back in time if you’ve already arrived. I don’t think “can” belongs there. You only travel to New York if you arrive, but you don’t say that you only can travel to New York if you arrive, even though it’s impossible to leave for New York and then disappear into the ether.
I can’t seem to parse this sentence. Please restate.
We know that Harry won’t successfully use his Time Turner from the fact that he hasn’t arrived in the past, but we don’t know why.
… That was lack of sleep talking.
And right now that we only know that Harry’s attempts to travel back in time doesn’t appear to stop Hermione’s death. That could be because for some reason Harry is unable to convince or blackmail Dumbledore and unable to defeat a simple casing despite knowing partial transfiguration, it could be because of an as-yet unstated limitation on the use of time-turners (which would be the bad storytelling trope known as “ass-pull”), or it could be because the same enemy which buffed the troll also takes precautions against counter-turning (for example, by taking meaningless information from 1800, encoding it into the junk DNA of some yeast, and putting the yeast into dinner; I would expect a smart dark wizard to consider something very analogous to this, and it takes a master of stable time loops to go back in time BEFORE eating the food, thwart the troll and save Hermione, then set up a fake troll and fake Hermione so that you can convince the enemy that their plan failed so that they later spend their re-do on attempting to stop yours)