User blog comment:Denis Maksudov/Slowly growing ordinal function and FS up to BHO./@comment-28606698-20170402064919

Funny, but only today I understand that uncountable ordinal can have own fundamental sequence. That is why I have rewritten section about fundamental sequences similar way with notation described in Deedlit's post. I still believe psi'-function allows to create simplier FS-system since here rules 1-3 (rules of Wainer hierarchy) unchangeably work up to Bachmann-Howard ordinal.