User blog comment:Dchew89/General Idea for my d(n) Function/@comment-35470197-20190306060453/@comment-35470197-20190306064818

> I like to say that only the FS's given can be used to make larger ordinals

Right. This is what I meant. You need to specify the system of all fundamental sequences which can be used, before defining \(d\).

And ok for your way to learn stuffs. I just pointed out it because I was afraid that you might not be aware of the point. If you have a clear logic in your mind, please never mind my comment.