Nuprl - Pf n0n1_irregular 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1

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At: n0n1 irregular 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1

1. S: ActionSet()
2. s: S.car
3. q: S.car
4. n:
5. f: S.carn
6. g: nS.car
7. g o f = Id
8. f o g = Id
9. k:. (S:n0n1(k)s) = q
10. i: (n+1)
11. j: (n+1)
12. i < j
13. f((S:([1]i)s)) = f((S:([1]j)s))
14. (S:([1]i)s) = (S:([1]j)s)
15. k:
16. (([0]j) @ ([1]i)) = (([0]k) @ ([1]k))
17. k = i
18. j||1:[0]||+i||1:[1]|| = k||1:[0]||+k||1:[1]||
19. ||1:([0]j)||+||1:([1]i)||0

False

By: RWH (RecUnfoldC `el_counter`) 18

Generated subgoal:

1 18. jif null([0])0 ;1=hd([0])1+||1:tl([0])|| else ||1:tl([0])|| fi +iif null([1])0 ;1=hd([1])1+||1:tl([1])|| else ||1:tl([1])|| fi = kif null([0])0 ;1=hd([0])1+||1:tl([0])|| else ||1:tl([0])|| fi +kif null([1])0 ;1=hd([1])1+||1:tl([1])|| else ||1:tl([1])|| fi
19. ||1:([0]j)||+||1:([1]i)||0
False

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