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The dustaculated-tethritertethracross (also called territethracrossturreted-tethritertethracross or tethritertethracrossturreted-tethritertethracross) is equal to E100(#^^##)^^#>(#^^##)^^#100 using Extended cascading-E notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
BEAF (X^^^X)^^(X^^^X) & 100
Bird's array notation \(\{100,100[1 \backslash 1[1 \backslash 2 \backslash 2]2 \backslash 2]2\}\)
Fast-growing hierarchy \(f_{\varepsilon_{\varepsilon_{\zeta_0+1}}}(100)\)
Hardy hierarchy \(H_{\varepsilon_{\varepsilon_{\zeta_0+1}}}(100)\)
Slow-growing hierarchy ???

Sources

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