IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
int segs from base by upper ind1111 1. P : Prop
2. a : 3. b:{...a}. P(a,b)
4. b:{a+1...}. (c:{a..b}. P(a,c)) P(a,b)
5. k : 6. k1:. k1<k (b:{a...}. b-ak1P(a,b))
7. b : {a...}
8. b-ak P(a,b)