User blog comment:Edwin Shade/Hyper Operations On Ordinals Using The M.O.S.T. Function/@comment-1605058-20180113194320/@comment-32783837-20180114150259

\(\omega\uparrow\uparrow\omega\alpha=\varepsilon_{\alpha-1}\) *

since  \(\omega\uparrow\uparrow\omega =\varepsilon_0\)