Vladimir_Nesov comments on A problem with Timeless Decision Theory (TDT) - Less Wrong

36 Post author: Gary_Drescher 04 February 2010 06:47PM

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Comment author: Vladimir_Nesov 21 December 2011 12:11:23PM *  2 points [-]

Particular counterfactual instances of you can't influence whether they are counterfactual or exist in some stronger sense.

What can influence things like that? Whatever property of a situation can mark it as counterfactual (more precisely, given by a contradictory specification, or not following from a preceding construction, assumed-real past state for example), that property could as well be a decision made by an agent present in that situation. There is nothing special about agents or their decisions.

Comment author: FAWS 21 December 2011 12:42:08PM *  2 points [-]

What can influence things like that?

Why do you think something can influence it? Whether you choose to cooperate or defect, you can always ask both "what would happen if I cooperated?" and "what would happen if I defected?". In as far as being counterfactual makes sense the alternative to being the answer to "what would happen if I cooperated?" is being the answer to "what would happen if I defected?", even if you know that the real you defects.

Compare Omega telling you that your answer will be the the same as the Nth digit of Pi. That doesn't you allow to choose the Nth digit of Pi.