116b- Homework 5

February 13, 2008

Homework 5

Due Tuesday February 19 at the beginning of lecture.

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116b- Lecture 10

February 13, 2008

We showed that \mathsf{ACA}_0 proves the completeness theorem. We then proved the second incompleteness theorem using the result on completeness, the fact that if a model of \mathsf{ACA}_0 thinks that it contains a model of \mathsf{ACA}_0 then we can really see this latter model, and the diagonal lemma.