Tethrarxichill

The tethrarxichill is equal to E100#^^^#1000 in Extended Cascading-E Notation. The term was coined by Sbiis Saibian.
==Approximations==
== Approximations in other notations ==
Notation 	Approximation
BEAF 	\(\{X,X,1,2\}\ \&\ 1000\) (weaker bound)
\(\{X,X,3\}\ \&\ 1000 \) (stronger bound)
Bird's array notation 	\(\{100,1000[1[1\neg3]2]2\}\)
Hyperfactorial array notation 	\(1000![1(1)2]\)
Dollar function 	\(1000$[[[[0]_2]_2]_2]\)
Fast-growing hierarchy (with this system of fundamental sequences)	\(f_{\varphi(1,0,0)}(999)\)\(=f\)\(_{\Gamma_0}\)\((999)\)
Hardy hierarchy (with this system of fundamental sequences) 	\(H_{\Gamma_{0}}(1000)\)
Slow-growing hierarchy 	\(g_{\vartheta(\Omega_2)}(1000)\)
==Sources==
Category:Numbers
Category:Numbers by Sbiis Saibian
Category:Extended Cascading-E numbers
Category:Binary phi level
Category:Pentacthulhum series