Some definitions of interest.
absval	Def |i| == if 0i i else -i fi
	Thm* x:. |x|
int_lower	Def {...i} == {j:| ji }
	Thm* i:. {...i}  Type

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