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The possible interpretation of tetrakulus is equal to $$4\&4\&4 = \{ 4,3 /2 \} = \{4,4,4,4\}\ \&\ 4$$ using the array of operator and BEAF.[1] It has supertet entries. The term was coined by Cookie Fonster, who was unsure if tetrakulus should be $$4\&4\&4$$ or $$4\&4\&4\&4$$, so he coined both interpretations and called the latter the tetrakulus. Since BEAF has not been formalised by Bowers at this level, this number is currently ill-defined.

## Approximations

Since it is not defined by now, the following approximation is just an expected value.

Notation Approximation
Fast-growing hierarchy $$f_{\varphi(3,\omega,0,0)}(4)$$
Hardy hierarchy $$H_{\varphi(3,\omega,0,0)}(4)$$

## Sources

1. Pointless Gigantic List of Numbers - Part 4: The Higher RoyalsPointless Large Number Stuff. Archived from the original on 2014-08-25. Retrieved 2017-05-27.

## See also

Jonathan Bowers' array of series
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