Nuprl - Proof: append split2 2 2 2 2 1 1

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At: append split2 2 2 2 2 1 1

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 :

7. 0<i
8. 0

i-1 < ||L||

P(i-1)

(

i:

||L||. P(i) & (

j:

i.

P(j)))
9. 0

i
10. i<||L||
11. P(i)
12. j :

i
13. P(j)

P(i-1)

By:	Decide (j = i-1)

Generated subgoals:

1 14. j = i-1
P(i-1)
1 step

2 14. j = i-1
P(i-1)
1 step

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