Edward Nelson retracted his inconsistency proof before it was published. Unfortunately, the outline given by Nelson has been removed. Is there a copy of it on the web? I am interested in how the hierarchy of sub-theories was defined. I would also accept any reference to a paper on the proof.
2026-03-27 13:40:11.1774618811
Reference request - Outline of Edward Nelson's Inconsistency Proof
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If you read through the comments, Terence Tao found an error in Nelson's "proof" and Nelson agreed that the error was real and invalidated the "proof". Anyway, a version of this retracted outline is available here.