User blog comment:Nayuta Ito/An attempt to well-define OCF as a number notation/@comment-32697988-20190428074647/@comment-25337554-20190501053100

>It looks interesting. Is the a well-known approach? I have never seen this rule. It looks to actually realise the UNOCF-like expansion up to Ω_4.

It was supposed to be the "insertion" rule.

>It seems to yield an infinite loop.

Let me see where in the definition is wrong. Now Fixed.

>& = & ψ_Ω_1(ψ_Ω_2(ψ_Ω_3(ψ_Ω_4(0))))[2] \\ >& = & ψ_Ω_1(ψ_Ω_2(ψ_Ω_3(ψ_Ω_4(0[2])))) \\

Let me see. I will use some syntax sugars.

ψ_Ω_1(ψ_Ω_2(ψ_Ω_3(ψ_Ω_4(0))))[2]

=ψ_Ω_1(ψ_Ω_2(ψ_Ω_3(ψ_Ω_4(0))[2]))

=ψ_Ω_1(ψ_Ω_2(ψ_Ω_3(ψ_Ω_3(0)))) (∵Cough(ψ_Ω_4(0))=Ω_3)

Now it should be well-collapsed.