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Tethrarxi-enn is equal to E100#^^^#9 in Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations

Notation Approximation
Fast-growing hierarchy $$f_{\varphi(\varphi(\varphi(\varphi(\varphi(\varphi(\varphi(\varepsilon_0,0),0),0),0),0),0),0)}(100)$$
$$\approx f_{\varphi(1,0,0)[10]}(100)$$ (using this system of fundamental sequences)

Sources

1. Saibian, Sbiis. 4.3.9 - Extended Cascading-E Numbers Part III. Retrieved 2017-01-11.
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