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At: l before member2 1 1 1
1. T : Type
2. L : T List
3. a : T
4. b : T
5. [a; b]  L
  [a]  [a; b]
By: BackThru
Thm* x1,x2:T, L1,L2:T List.
Thm* [x1 / L1]  [x2 / L2]  x1 = x2 & L1  L2  [x1 / L1]  L2
THEN
Reduce 0

Generated subgoal:

1   a = a & nil  [b]  [a]  [b]
1 step

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

(5steps total) PrintForm Definitions Lemmas mb list 1 Sections MarkB generic Doc