Stuart_Armstrong comments on Should logical probabilities be updateless too? - Less Wrong

9 Post author: cousin_it 28 March 2012 10:02AM

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Comment author: Stuart_Armstrong 28 March 2012 05:54:17PM *  0 points [-]

If I'm Omega, and I decide to check whether the 10^10 th digit of pi is 0, 2 or 5, and reward you if it is... how would you feel about that? I chose those numbers because we have ten fingers, and I chose reward because "e" is the 5th letter in the alphabet (I went through the letters of "reward" and "punish" until I found one that was the 10th (J), 5th (E) or 2nd (B) letter).

Or a second variant: I implement the logical-coin CM that can be described in python in the most compact way.

Comment author: gRR 28 March 2012 06:05:54PM 1 point [-]

If it's true that you chose the numbers because we have ten fingers (and because of nothing else), and I can verify that, then I feel I should behave as if the event is random with probability 0.3, even if it was the 10-th digit of pi, not 10^10-th.

Comment author: Stuart_Armstrong 28 March 2012 07:34:44PM 2 points [-]

Yep - welcome to logical uncertainty!

Comment author: gRR 28 March 2012 08:04:23PM *  0 points [-]

I never had anything against logical uncertainty :)

The point, though, is that this setup - where I can verify Omega's honest attempt at randomness - does not produce the paradoxes. In particular, it does not allow someone to pump money out of me. And so it seems to me that I can and should "keep paying up in Counterfactual Mugging even when the logical coinflip looks as obvious as 2+2=4."