User blog comment:PsiCubed2/A "Map" of Large Numbers (Comparing Notations) for Reference/@comment-28606698-20170501154645

Sorry, but I'm MaksUdov:-)

Extended arrows notation is  notation with open-end. As well as FGH, this is defined so far as fundamental sequences defined. Just now I visited page on my site, where this notation described, and I added links to pages, where FS are defined for Veblen's function up to LVO and for Buchholz's function up to omega fixed point. That allows to plug in ordinals generated by this functions.