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At: append split2 1 1 2

1. T : Type
2. L : T List
3. P : ||L||Prop
4. x:||L||. Dec(P(x))
5. i,j:||L||. P(i i<j  P(j)
6. i : ||L||
7. P(i)
8. j:iP(j)
9. i@0 : ||L||
10. P(i@0)
  ||firstn(i;L)||i@0


By: RWO Thm* as:A List, n:{0...||as||}. ||firstn(n;as)|| = n   0 THEN SupposeNot


Generated subgoal:

1 11. ii@0
  ii@0

1 step

About:
listdecidableintnatural_numberless_thanapply
functionuniverseequalpropimplies
all
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