User blog comment:Edwin Shade/A Slight Change to Knuth's Up Arrow Notation/@comment-31837178-20171015023348

This may be really useful in describing a hierarchy of fast-growing function transforms that I've been working on. There's a point in this hierarchy where I'm fairly certain the functions begin to dominate epsilon-nought, but I'm having a hard time sketching out a way to show that clearly. This could do the trick.