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(Q6157)
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instance of
hyperoperation
series ordinal
4
follows
exponentiation
followed by
pentation
0 references
binary operation
0 references
defining formula
n
a
=
{
1
,
n
=
0
a
[
(
n
−
1
)
a
]
,
n
>
0
{\displaystyle {^{n}a}={\begin{cases}1,&n=0\\a^{\left[^{(n-1)}a\right]},&n>0\end{cases}}}
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⧼wikibase-sitelinks-mywikigroup⧽
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![{\displaystyle {^{n}a}={\begin{cases}1,&n=0\\a^{\left[^{(n-1)}a\right]},&n>0\end{cases}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/54d885d585ace75990d2d1b5f0c124ec16d8fa3f)