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Eliezer_Yudkowsky comments on The Cartoon Guide to Löb's Theorem - Less Wrong

12 Post author: Eliezer_Yudkowsky 17 August 2008 08:35PM

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Comment author: Eliezer_Yudkowsky 18 August 2008 06:21:58AM 2 points [-]

so what you really would have needed to apply the deduction theorm would have been

PA + "◻C -> C" |- C

do I win?

Why doesn't the given proof of Lob's Theorem, the steps 1-10, show that PA + "◻C -> C" |- C?