2. 0<b
3.
f:(
). (
n:. n
b-1 & f(n)) 
f(mu(f)) & (i:. i<mu(f) 
f(i))
4. f :
5. n :
6. n
b
7. f(n)
8.
f(0)
9.
n = 0
10. f(mu(
x.f(x+1))+1)
11.
i:. i<mu(x.f(x+1)) f(i+1)
12. i :
13. i<mu(
x.f(x+1))+1
14.
i = 0
15.
f(i-1+1)
f(i)
