IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
array append wf111 1. T : Type
2. i :
3. j : {i...}
4. k : {j...}
5. a : [T]Array
6. a.l = i 7. a.u = j 8. b : [T]Array
9. b.l = j 10. b.u = k a @ b [T]Array
By:
OnHyps [8;9;5;6] Analyze THEN Unfold `array_append` 0 THEN OnAllClauses AbReduce