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RichardKennaway comments on Welcome to Less Wrong! (5th thread, March 2013) - Less Wrong
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This can never be put into practice. A person can try to find knowledge, but there is nothing they can do to determine whether they have successfully found knowledge -- any such attempts collapse into part of trying to find knowledge. There is no way of getting to a meta-level from which you can judge whether your efforts bore fruit. The ladder has no rungs.
raises eyebrows
You're saying it's impossible for any evidence to change your estimate of whether something will help people?
No, just that while you can try harder to find knowledge, there isn't a separate metalevel at which seeing if you really have knowledge is a different activity.
If you can receive information that provides strong Bayesian evidence that you're belief is true, how is there "nothing they can do to determine whether they have successfully found knowledge"?