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The tethrapeton (also called tethrapenteract) is equal to E100#^^#^#5 = E100#^^#####100 in Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Etymology Edit

The name of this number is based on the number tethrathoth and the root "peton" from "polypeton". Polypeton is the name for a 6-dimensional figure and 6-D figures are constructed from multiple 5-D figures (hence the "poly"), so a "peton" can be considered a 5-dimensional figure.

Approximations in other notations Edit

Notation Approximation
BEAF \(X \uparrow^6 101\ \&\ 100\)
Bird's array notation \(\{100,6 [1 [2 \neg 2] 2] 2\}\)
Hyperfactorial array notation \(100![1] w/8\)
Fast-growing hierarchy \(f_{\varphi(5,0)}(99)\)
Hardy hierarchy \(H_{\varphi(5,0)}(100)\)
Slow-growing hierarchy \(g_{\vartheta(\varphi(5,\Omega+1))}(100)\)

Sources Edit

  1. Saibian, Sbiis. 4.3.7 - Extended Cascading-E Numbers Part I. Retrieved 2016-12-19.

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