Terrible terrible tethrahexon is equal to E100((#^^#^6)^^#)^^#100 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
Fast-growing hierarchy \(f_{\varepsilon_{\varphi(6,0)+2}}(100)\)
Hardy hierarchy \(H_{\varepsilon_{\varphi(6,0)+2}}(100)\)

Sources

Community content is available under CC-BY-SA unless otherwise noted.