IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
select firstn1111 1. T : Type
2. n :
3. 0<n 4. as:T List. n-1||as|| (i:(n-1). firstn(n-1;as)[i] = as[i])
5. 0<n 6. T List
7. u : T 8. v : T List
9. n||v||+1
10. i : n 11. i = 0
(u.firstn(n-1;v))[i] = (u.v)[i]