Fast Iteration Hierarchy

The Fast iteration hierarchy is a system similar to the Fast-growing hierarchy. https://sites.google.com/view/ubersketch/fast-iteration-hierarchy
== Definition ==
f(a){[1]b} = f(f(...)) with b f()
f(a){[b+1]c} = f(a){[b]a[b]a...} with c [b]
f(a){[b]c} = f(a){[ath member of the fundamental sequence of b]c} iff b is a limit ordinal
f(a){[b]c[d]e...} = g(a){[d]e...} where g(a) = f(a){[b]c}
== Sources ==
Category:Hierarchies