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At: reach lemma 1 2 2 1 1 1 2 1 1
1. Alph: Type
2. S: ActionSet(Alph)
3. si: S.car
4. nn:
5. f: nnAlph
6. g: Alphnn
7. Fin(S.car)
8. InvFuns(nn; Alph; f; g)
9. n:
10. 0 < n
11. RL: {y:{x:(S.car*)| 0 < ||x|| & ||x||n-1+1 }| y[(||y||-1)] = si }
12. ||RL|| = n-1+1
13. i:||RL||, j:i. RL[i] = RL[j]
14. s:S.car. mem_f(S.car;s;RL) (w:Alph*. (S:wsi) = s)
15. k:. knn (RLa:S.car*. (i:{1..||RL||}, a:Alph. mem_f(S.car;S.act(a,RL[i]);RL) mem_f(S.car;S.act(a,RL[i]);RLa)) & (a:Alph. g(a) < k mem_f(S.car;S.act(a,hd(RL));RL) mem_f(S.car;S.act(a,hd(RL));RLa)) & (s:S.car. mem_f(S.car;s;RLa) (w:Alph*. (S:wsi) = s)))
16. RLa: S.car*
17. i:{1..||RL||}, a:Alph. mem_f(S.car;S.act(a,RL[i]);RL) mem_f(S.car;S.act(a,RL[i]);RLa)
18. a:Alph. g(a) < nn mem_f(S.car;S.act(a,hd(RL));RL) mem_f(S.car;S.act(a,hd(RL));RLa)
19. s:S.car. mem_f(S.car;s;RLa) (w:Alph*. (S:wsi) = s)
20. La': S.car*
21. t:S.car. mem_f(S.car;t;RLa) mem_f(S.car;t;RL) mem_f(S.car;t;La')
22. t:S.car. mem_f(S.car;t;La') mem_f(S.car;t;RLa)
23. ||La'||1 mem_f(S.car;hd(La');RL)
24. ||La'||1
25. i: (||RL||+1)
26. j: i
27. j = 0

(hd(La').RL)[i] = (hd(La').RL)[j]
By:
RWH (HypC -1) 0
THEN
Unfold `select` 0
THEN
RecUnfold `nth_tl` 0
THEN
Reduce 0
Generated subgoals:

1 i < ||hd(La').RL||
2 j < ||hd(La').RL||
3 hd(if i0 hd(La').RL else nth_tl(i-1;RL) fi) = hd(La')

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