User blog comment:Ubersketch/How 2 make aray notaiton/@comment-35470197-20181115235128

I think that it is good to an ordinal notation below \(\varepsilon_0\). If you do not know what ordinal means, the start point is to understand \(\omega, \omega \times 2, \ldots, \omega \times \omega\). You need to understand ordinals such as \(\omega^{\omega}\) and \(\varepsilon_0\), which are more difficult than \(\omega \times \omega\), in order to create array notations.