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IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At: select zip
  T1,T2:Type, as:T1 List, bs:T2 List, i:.
  i<||zip(as;bs)||  zip(as;bs)[i] = <as[i],bs[i]>
By: ((Analyze 0) THEN (Analyze 0) THEN (Analyze 0)) THEN ListInd -1 THEN Analyze 0
THEN
ListInd -1
THEN
RecUnfold `zip` 0
THEN
Reduce 0
THEN
Try (Complete Auto)

Generated subgoal:

1 1. T1 : Type
2. T2 : Type
3. T1 List
4. u : T1
5. v : T1 List
6. bs:T2 List, i:. i<||zip(v;bs)||  zip(v;bs)[i] = <v[i],bs[i]>
7. T2 List
8. u1 : T2
9. v1 : T2 List
10. i:. i<||zip([u / v];v1)||  zip([u / v];v1)[i] = <[u / v][i],v1[i]>
  i:. 
  i<||zip(v;v1)||+1  [<u,u1> / zip(v;v1)][i] = <[u / v][i],[u1 / v1][i]>
3 steps

About:
pairproductlistconsnatural_numberaddless_thanuniverseequalimpliesall
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(4steps total) PrintForm Definitions Lemmas mb list 1 Sections MarkB generic Doc