Who Cites nnsub?
nnsub	Def nnsub(m;n) == if m<n then 0 else m-n fi
	Thm* m,n:. nnsub(m;n)
lt_int	Def i<j == if i<j true ; false fi
	Thm* i,j:. (i<j)
bif	Def bif(b; bx.x(bx); by.y(by)) == if b x(*) else y(x.x) fi
	Thm* A:Type, b:, x:(bA), y:((b)A). bif(b; bx.x(bx); by.y(by))  A
bfalse	Def false == inr()
	Thm* false
btrue	Def true == inl()
	Thm* true
ifthenelse	Def if b t else f fi == InjCase(b ; t; f)
	Thm* b:, A:Type, p,q:A. if b p else q fi  A

Syntax:

nnsub(m;n)

has structure:

nnsub(m; n)

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