User blog comment:Denis Maksudov/M-notation (M-function)/@comment-11227630-20160611023101/@comment-5529393-20160611223459

I think what Hyp Cos was asking for was a general definition of $$\alpha \uparrow^b \beta$$, so that we can evaluate arbitrary expressions. You say that ω↑↑↑ω= ζ0, but why?