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The tethraturreted-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^^X) & 100
Bird's array notation \(\{100,100[1 \backslash 1 \backslash 1[1 \backslash 2]2]2\}\)
Fast-growing hierarchy \(f_{\zeta_{\varepsilon_0} }(100)\)
Hardy hierarchy \(H_{\zeta_{\varepsilon_0} }(100)\)
Slow-growing hierarchy ???

Sources[]

  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-03-08.