steven0461 comments on Existential Angst Factory - Less Wrong

45 Post author: Eliezer_Yudkowsky 19 July 2008 06:55AM

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Comment author: steven0461 07 June 2011 07:34:56PM 0 points [-]

I wonder if it's fair to say that indifference isn't a preference in the same sense that zero and one aren't probabilities.

Comment author: Wei_Dai 07 June 2011 08:39:58PM *  2 points [-]

0 and 1 as probabilities do make sense under the UDT probability-as-measure-of-caring interpretation (as opposed to the Bayesian probability-as-subjective-degree-of-confidence interpretation). In UDT you don't do Bayesian updating so you don't run into the divide-by-zero problem with probability 0 events, so you can rule it out as a valid probability on purely mathematical grounds. (EDIT: Obviously I meant to write "can't" in the last sentence.)

Comment author: cousin_it 08 June 2011 09:13:24AM 0 points [-]

Good point. Also, we can push steven0461's analogy a bit further by saying indifference is what happens when UDT finds itself in a universe that has prior probability 0 :-)