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Houshalter comments on Magic and the halting problem - Less Wrong
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The laws of physics are the same (in MWI, not other multiverse theories.) But there could be a universe where the are are advanced aliens with nanotech, which for some reason decide to mimic magic exactly. Or where, mysteriously, every time someone says "wingardium leviosa", objects happen to levitate, just by chance of random quantum effects.
I do think that both of these universes are so unlikely we shouldn't worry about ever being in them. But I think that is what OP is getting at.
I think that the first universe is sufficiently more likely than the second that you shouldn't assume it's a coincidence, and you should expect wingardium leviosa to keep working.
I agree, but I think OP is referring to the second situation. He's not saying that it's probable, just that it's possible and we can't ever rule it out. These issues go away when you internalize probability, but I understand how people can be confused on issues like this.