IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
sfa doc ntuple contains wf11 1. A : Type
2. P : AProp
3. n :
4. n1:. n1<n (X:(A^n1). ( u in X: A^n1. P(u)) Prop)
5. X : A^n (n = 1 & P(X) n2 & (X/a,rest. P(a) ( u in rest: A^(n-1). P(u))))
Prop