User blog comment:Wythagoras/FGH of Dollar Function new version/@comment-11227630-20131109131352/@comment-11227630-20131111102808

I think the U is exactly the "tetranaccessible" cardinal after inaccessible, mahlo (or "binaccessible"), compact (or "trinaccessible") cardinal. And the A is a mahlo tetranaccessible cardinal. They're a long way below first "pentanaccessible" cardinal. Nuff said about the limit of the "stage function"!