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Xappol is equal to {10,10 (2) 2}, or 10 by 10 array of 10's in BEAF.[1]

The xappol is written out in the multirowed array notation as:

    / 10 10 10 10 10 10 10 10 10 10 \

/  10 10 10 10 10 10 10 10 10 10  \

/   10 10 10 10 10 10 10 10 10 10   \

/    10 10 10 10 10 10 10 10 10 10    \

/     10 10 10 10 10 10 10 10 10 10     \

\     10 10 10 10 10 10 10 10 10 10     /

\    10 10 10 10 10 10 10 10 10 10    /

\   10 10 10 10 10 10 10 10 10 10   /

\  10 10 10 10 10 10 10 10 10 10  /

\ 10 10 10 10 10 10 10 10 10 10 /


## Approximations

Notation Approximation
Bird's array notation $$\{10,10 [3] 2\}$$
Cascading-E notation $$\textrm E10\#\textrm{^}\#\#10$$
Hyperfactorial array notation $$10![1,[1,1,3],1,2]$$
Fast-growing hierarchy $$f_{\omega^{\omega^2}}(10)$$
Hardy hierarchy $$H_{\omega^{\omega^{\omega^2}}}(10)$$
Slow-growing hierarchy $$g_{\vartheta(\Omega^{\Omega\omega})}(10)$$

## Trivia

• The Googology Wiki IRC channel used to have a bot named XappolBot.
• Jonathan Bowers describes Xappol as βunspeakably hugeβ on his Infinity Scrapers website. He also writes out Xappol's full array on his website. However, he writes it incorrectly, giving it 11 rows instead of 10.

## Sources

1. β Bowers, JonathanInfinity Scrapers. Retrieved January 2013.