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At: lang sing prod 1 1 1 1 1 1 2 1 1 2

1. Alph: Type
2. L: Alph*Prop
3. l: Alph*
4. i: {0...||l||}
5. (l[0..i]) = nil
6. L(l[i..||l||])
7. i-0 = 0
8. i = 0

L(l)

By: RWH (HypC 8) 6

Generated subgoal:

16. L(l[0..||l||])
7. i-0 = 0
8. i = 0
L(l)


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applyuniversefunctionlistprop
natural_numberequalnilintsubtract