The tethriterated-tethracross (also called hundred-ex-terrible tethracross) 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)^^(2X) & 100
Bird's array notation ???
Fast-growing hierarchy \(f_{\varepsilon_{\zeta_0+{\omega}}}(100)\)
Hardy hierarchy \(H_{\varepsilon_{\zeta_0+{\omega}}}(100)\)
Slow-growing hierarchy ???


  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-01-22.
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