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Benja comments on An angle of attack on Open Problem #1 - Less Wrong
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Now again unsure whether I can show this. Argh.
ETA: The argument I want to be making is the one from the third paragraph in the proof sketch. The problem is the quantification over p -- I need to show in PPT that "for all p, if PPT proves 'p is safe for K steps', then p is safe for K-1 steps". But the axioms of PPT (v0.2) don't allow for parameters (free variables) in the statement C.
I seem to have fixed the remaining problems; new proof attempt here.