Some definitions of interest.
hanoi_PEG	Def  Peg == {1...3}
	Thm*  Peg  Type
hanoi_seq_join	Def  (s1 @(m) s2)(x) == if xm s1(x) else s2(x) fi
	Thm*  n:, m,a,z:, s1:({a...m}{1...n}Peg), s2:({m+1...z}{1...n}Peg). Thm*  (s1 @(m) s2)  {a...z}{1...n}Peg
int_iseg	Def  {i...j} == {k:| ik & kj }
	Thm*  i,j:. {i...j}  Type
nat	Def   == {i:| 0i }
	Thm*    Type

About: IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html