User:Googleaarex/Extended Up-Arrow Notation/Hyperarray

Hyperarray Up-Arrow Notation is 5th part of Extended Up-arrow Notation series.

Up to \(\psi(\psi_{\chi(\zeta_{M+1})}(0))\)
Let \(a \uparrow_{,_{(2)\uparrow}\uparrow} b = a \uparrow_{\underbrace{,_{... ,_b\uparrow ...}\uparrow}_{b}} a\) (growth rate \(\psi(\psi_{\chi(\varepsilon_{M+1})}(0))\)).