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The tethrathoth-by-deutero-hyperion 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 \(\{100,100 (X \uparrow\uparrow X) 100,100\}\)[2]
Bird's array notation \(\{100,100 [1 \backslash 2] 100,100\}\)
Fast-growing hierarchy \(f_{\varepsilon_0 \omega^2}(100)\)
Hardy hierarchy \(H_{\varepsilon_0^{\omega^2}}(101)\)
Slow-growing hierarchy \(g_{\vartheta(\varepsilon_{\Omega2}\Omega \omega)}(99)\)

Sources[]

  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-01-02.
  2. Using particular notation \(\{a,b (X \uparrow\uparrow X) c \#\}\) for \(\{X \uparrow\uparrow b\ \&\ a (X \uparrow\uparrow X) c-1 \#\}\)
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