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At: no repeats cons 1 1

1. T : Type
2. l : T List
3. x : T
4. i,j:i<||l||+1  j<||l||+1  i = j  [x / l][i] = [x / l][j]
5. i : 
6. j : 
7. i<||l||
8. j<||l||
9. i = j
10. [x / l][(i+1)] = [x / l][(j+1)]
  l[i] = l[j]


By: RWO Thm* a:Tas:T List, i:. 0<i  i||as||  [a / as][i] = as[(i-1)] -1
THEN
ArithSimp -1


Generated subgoals:

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About:
listconsintnatural_numberaddsubtractless_thanuniverseequalimpliesall
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(7steps total) PrintForm Definitions Lemmas mb list 1 Sections MarkB generic Doc