Octaddep

Octaddep is equal to \(f_{\varepsilon_0+8}(10)\) using the fast-growing hierarchy.My system of number names (FGS) - Traveling To The Infinity The term was coined by wiki user Denis Maksudov.
== Etymology ==
The 3 parts of the name, "octi", "add" and "ep", mean 8, addition and \(\varepsilon_0\) respectively, which form \(\varepsilon_0+8\) when concatenated backwards. So the full name indicates the ordinal index of the FGH.
== Approximations in other notations ==
Notation 	Approximation
BEAF 	\(\{10,10,9 (X \uparrow\uparrow X) 2\}\)Using particular notation \(\{a,b (X \uparrow\uparrow X) 2\}\) for \(X \uparrow\uparrow b\ \&\ a\).
Bird's array notation 	\(\{10,10,9 [1 \backslash 2] 2\}\)
Hyperfactorial array notation	\(10![9,1,1,1,2]\)
Extended Cascading-E Notation	\(E10\#\text{^^}\#10\#\#9\)
Hardy hierarchy 	\(H_{\varepsilon_0 \omega^8}(10)\)
Slow-growing hierarchy 	\(g_{\vartheta(\varepsilon_{\Omega2}+7)}(10)\)
== Sources ==
Category:Numbers
Category:Numbers by Denis Maksudov
Category:10-based FGH numbers
Category:Epsilon level
Category:-ep