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Ackermann function is not primitive recursive

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03D75 no label found


Hi, I’m arishiki. I’m new to this site, so I’m afraid I would do some inappropriate things. If so, please notice on me.

Thank you for great entry, CWoo. But I think A(q,A(2,z))=A(q+4,z)AqA2zAq4zA(q,A(2,z))=A(q+4,z) at the last of the proof would be a mistake and you should have meant A(q,A(2,z))<A(q+4,z)AqA2zAq4zA(q,A(2,z))<A(q+4,z).

Thank you.

Hi Arishiki - Welcome to the site. You can use LaTeX in forum posts and pretty much everywhere…

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