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Results tagged with proof-theory
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user 8628
For question in Proof Theory, where "proofs" themselves are the object of mathematical investigation. It is not to be used to request a proof of some result.
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"Strange" proofs of existence theorems
I would call the proof for the existence of the limit $0$ of the Goodstein sequence pretty weird: it uses infinite ordinals, but the sequence itself is within $\mathbb{N}$. In Peano artithmetic, Goods …
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