pengvado comments on No one knows what Peano arithmetic doesn't know - Less Wrong
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The title is a reference to No One Knows What Science Doesn't Know, from which I infer that it's supposed to be read as "There is some set {what PA knows}. No one can know exactly where the boundaries of this set are.", not "There is some set {what PA knows}. No one can know the truth value of any proposition not in this set.".