User blog comment:MilkyWay90/Help understand the zeta ordinals/@comment-32697988-20180620044153

\(\zeta_1=\varepsilon_{\varepsilon_{\varepsilon_{..._{\varepsilon_{\zeta_0+1}}}}}\)

\(\zeta_2=\varepsilon_{\varepsilon_{\varepsilon_{..._{\varepsilon_{\zeta_1+1}}}}}\)

\(\Epsilon\)