IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
select tl A:Type, as:A List, n:(||as||-1). tl(as)[n] = as[(n+1)]
By:
(CDToVarThen `as' Analyze) THEN (Reduce 0) THEN RepD
Generated subgoals:
1
1. A : Type
2. A List
3. n : (-1)
nil[n] = nil[(n+1)] A