User blog comment:PsiCubed2/CURRENT VALUE OF PEGG/@comment-25337554-20180710102841/@comment-25337554-20180711102433

>Isn't it the "standard digital format" for professional mathematics? Surely there are some uses for this kind notational nesting in the academic literature?

They might use their own notations for nested arrows, or just FGH.

>why you and I are the only people who are interested in the notation

All other people just want to talk about bigger and bigger infinities. Now almost nobody seems to be interested in such small numbers.