User blog comment:Ikosarakt1/Fast-growing hierarchy/@comment-78.22.170.27-20130619192628/@comment-78.22.170.224-20130624202125

I am willing to answer the question on Loader's ordinal. For this I would need a link to that ordinal.

I am also willing to share -- if there somebody would be interested -- special knowledge about ordinal diagrams and  Gordeev style notations (Systems of iterated projective ordinal notations and combinatorial statements about binary labeled trees) and I know how to compare theta with psi functions.

The general interest on ordinal notations has been limited over the last twenty years. I would of course appreciate a revival. The top experts in the area are still Toshiyasu Arai, Wilfried Buchholz and Michael Rathjen.