User blog comment:Tetramur/Pentational arrays and beyond - comparisons/@comment-37993808-20191211162933/@comment-35470197-20191212095957

@Tetramur

You seem not to understand ordinals. For example, please honestly explain how Busy Beaver functions (with oracles too), xi function, doodle function, Fish fourth function can be expressed as such "ordinals" in those hierarchies while Rayo's function and Fish seventh function cannot.

@Triakula

No. The statement by Tetramur does not make sense.