[FOM] Only one proof

Charles Silver silver_1 at mindspring.com
Thu Sep 3 10:13:59 EDT 2009

On Aug 31, 2009, at 2:41 PM, Aatu Koskensilta wrote:
> Another example: Gödel's proof for the first incompleteness theorem
> understood as the result that the set of Pi-1 truths is productive.
> I'm not aware of any way of proving this result without going through
> essentially the recursion theoretic contortions found in the original
> proof. (I may well be just ignorant.)

	I may too, but I don't recall Kripke's proof as presented by Putnam  
(Notre Dame, 2000?) as having "recursion theoretic contortions".

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