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shminux comments on Timeless Identity - Less Wrong
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Well, let's call P1 my probability of actually going to the beach, even if you never show up. That is, (1-P1) is the probability that traffic keeps me from getting there, or my car breaks down, or whatever. And let's call P2 my probability of your VR/simulation rig working. That is, (1-P2) is the probability that the scanner fails, etc. etc.
In your scenario, I put a P1 probability of ending up at the beach, and a P2 probability of ending up bowling. If both are high, then I'm confident that I will do both.
There is no "instead of". Going to the beach does not prevent me from bowling. Going bowling does not prevent me from going to the beach. Someone will go to the beach, and someone will go bowling, and both of those someones will be me.
As I alluded to in another reply, assuming perfectly reliable scanning, and assuming that you hate losing in bowling to MarkAI, how do you decide whether to go practice bowling or to do something else you like more?
If it's important to me not to lose in bowling, I practice bowling, since I expect to go bowling. (Assuming uninteresting scanning tech.)
If it's also important to me to show off my rocking abs at the beach, I do sit-ups, since I expect to go to the beach.
If I don't have the time to do both, I make a tradeoff, and I'm not sure exactly how I make that tradeoff, but it doesn't include assuming that the going to the beach somehow happens more or happens less or anything like that than the going bowling.
Admittedly, this presumes that the bowling-me will go on to live a normal lifetime. If I know the simulation will be turned off right after the bowling match, I might not care so much about winning the bowling match. (Then again, I might care a lot more.) By the same token, if I know the original will be shot tomorrow morning I might not care so much abuot my abs. (Then again, I might care more. I'm really not confident about how the prospect of upcoming death affects my choices; still less how it does so when I expect to keep surviving as well.)