Some definitions of interest.
int_lower	Def  {...i} == {j:| ji }
	Thm*  i:. {...i}  Type
int_upper	Def  {i...} == {j:| ij }
	Thm*  n:. {n...}  Type
le	Def  AB == B<A
	Thm*  i,j:. (ij)  Prop
not	Def  A == A  False
	Thm*  A:Prop. (A)  Prop

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