Some definitions of interest.
comment	Def  Kind of comment: $kind == a
prime_factorization_of	Def  f is a factorization of k Def  == (x:Prime. k<x  f(x) = 0) & k = {2..k+1}(prime_mset_complete(f))
	Thm*  f:(Prime), k:. f is a factorization of k  Prop
prime_nats	Def  Prime == {x:| prime(x) }
nat	Def   == {i:| 0i }
	Thm*    Type
le	Def  AB == B<A
	Thm*  i,j:. (ij)  Prop

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