What is false is that you ought to have disposition a and do B.
OK. So the argument is this one:
According to two-boxers, you ought to (i) have the disposition to one-box, and (ii) take two boxes.
It is impossible to do (i) and (ii).
Ought implies can.
So two-boxers are wrong.
But, on your use of “disposition”, two-boxers reject 1. They do not believe that you should have a FAWS-disposition to one-box, since having a FAWS-disposition to one-box just means “actually taking one box, where this is not a result of randomness”. Two-boxers think you should non-randomly choose to take two boxes.
ETA: Some two-boxers may hesitate to agree that you “ought to have a disposition to one-box”, even in the philosopher’s sense of “disposition”. This is because they might want “ought” to only apply to actions; such people would, at most, agree that you ought to make yourself a one-boxer.
Rachel does not envy Irene her choice at all. What she wishes is to have the one-boxer’s dispositions, so that the predictor puts a million in the first box, and then to confound all expectations by unpredictably choosing both boxes and reaping the most riches possible.
Richard is probably using disposition in a different sense (possibly the model someone has of someones disposition in my sense) but I believe Eliezer’s usage was closer to mine, and either way disposition in my sense is what she would need to actually get the million dollars.
OK. So the argument is this one:
According to two-boxers, you ought to (i) have the disposition to one-box, and (ii) take two boxes.
It is impossible to do (i) and (ii).
Ought implies can.
So two-boxers are wrong.
But, on your use of “disposition”, two-boxers reject 1. They do not believe that you should have a FAWS-disposition to one-box, since having a FAWS-disposition to one-box just means “actually taking one box, where this is not a result of randomness”. Two-boxers think you should non-randomly choose to take two boxes.
ETA: Some two-boxers may hesitate to agree that you “ought to have a disposition to one-box”, even in the philosopher’s sense of “disposition”. This is because they might want “ought” to only apply to actions; such people would, at most, agree that you ought to make yourself a one-boxer.
From the original post:
Richard is probably using disposition in a different sense (possibly the model someone has of someones disposition in my sense) but I believe Eliezer’s usage was closer to mine, and either way disposition in my sense is what she would need to actually get the million dollars.