IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
iseg nil T:Type, L:T List. L nil null(L)
By:
Unfold `iseg` 0 THEN ObviousListInduction
Generated subgoals:
None
About:
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
T:Type, L:T List. L 
nil 
null(L)
