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

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

L(l)

By: Reduce 7

Generated subgoal:

17. ||l||-i = 0
L(l)


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applyuniversefunctionlistprop
natural_numberequalnilintsubtract