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Hendecation is the 11th hyperoperation, which is equal to $$a \uparrow^{9} b$$ in Knuth's up-arrow notation.[1]

The n hendecated to m is n decated to n decated to ... decated to n (m n's).

Hendecation can be written in BEAF as $$\{a,b,9\}$$, in chained arrow notation as $$a \rightarrow b \rightarrow 9$$ and in Hyper-E notation as E(a)1#1#1#1#1#1#1#1#b.

Hendecational growth rate is comparable to $$f_{10}(n)$$ in the fast-growing hierarchy.

Sources Edit

1. Hendecation on Net Helper
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