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# 12AbBa

My favorite wikis
• ## 12AbBa's hierarchy

March 28, 2017 by 12AbBa

12H is a super fast-growing hierarchy.

$$A_0(n)=\text{FOOT}(n) \\ A_{b+1}(n)=A^n_b(n)$$

$$A_{\alpha}(n)=A_{\alpha[n]}(n)$$ if and only if $$\alpha$$ is a limit ordinal.