User blog comment:MilkyWay90/I'm ready for the easiest OCF!/@comment-35470197-20180821012104/@comment-35470197-20180822074132

> Weak?

I wrote this comment as comparison to Rpakr's opinion. (See his comment below.)

Yeah, personally I regard Buchholz's psi as outstandingly strong one.

> For a person who wants to learn the basics of OCFs, even Buchholz's OCF is too strong and too complicated (it also has the disadvantage of being difficult to extend further).

Really? I thought that Buchholz's one is much simpler than theta functions, and is good to grasp the strategy on OCFs. It helps us to understand how cardinals and cofinality essentially work, and how functions are translated into notations.

But I agree that starting from (non-indexed) single psi is also good.