IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
hanoi seq permutepegs11 1. n : 2. a : 3. z : 4. s : {a...z}{1...n}Peg
5. s is a Hanoi(n disk) seq on a..z 6. f : PegPeg
7. Inj(Peg; Peg; f)
8. (x,i. f(s(x,i))) {a...z}{1...n}Peg
9. x : {a...z}
10. x' : {a...z}
11. x+1 = x' 12. k : {1...n}
13. Moving disk k of n takes s(x) to s(x')
Moving disk k of n takes i.f(s(x,i)) to i.f(s(x',i))