Some definitions of interest.
div_nrel	Def Div(a;n;q) == nq  a < n(q+1)
	Thm* a:, n:, q:. Div(a;n;q)  Prop
divides	Def b | a == c:. a = bc
	Thm* a,b:. (a | b)  Prop
nat	Def  == {i:| 0i }
	Thm*   Type
nat_plus	Def  == {i:| 0<i }
	Thm*   Type

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