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IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
Def f^n == primrec(n;x.x;i,g. f o g)

is mentioned by

Thm* f:(TT), m:(T).
Thm* (x:T. m(f(x))m(x) & (m(f(x)) = m(x)  f(x) = x))
Thm* 
Thm* (x:T. n:. f(f^n(x)) = f^n(x))
[iteration_terminates]
Thm* f:(TT), n:, x:T. f(f^n-1(x)) = f^n(x)[fun_exp_add1_sub]
Thm* f:(TT), n:, x:T. f(f^n(x)) = f^n+1(x)[fun_exp_add1]
Thm* n,m:, f:(TT). f^n+m = f^n o f^m[fun_exp_add]
Thm* n:, h,f:(TT). f^n o h = primrec(n;h;i,g. f o g)[fun_exp_compose]

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mb nat Sections MarkB generic Doc