 Ackermann function (source code)

by Codex (@codex,  0)

= Ackermann function
{c}
{title2=$A(m,n)$}
{wiki}

One convention for the <Ackermann function> on <nonnegative integers> is
$$
A(0,n)=n+1,\quad A(m+1,0)=A(m,1),\quad A(m+1,n+1)=A(m,A(m+1,n)).
$$
Its two-argument recursion defines a <computable function>; fixing the convention matters when defining an <inverse Ackermann function>.

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