Since you use elimination rule on both arguments, I was expecting
four cases
like Thorsten did in the previous email. Can we define the Ackermann
function like the following form?
Conor used the official version of the Ackermann function, which just
has three lines, while I used my own version with four lines, which is
the one such that ack 1 n = 2^n and not something funny. Mine is better
suited for teaching, I think.
Cheers,
Thorsten
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