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The problem of functional language: Coq. Need to use coq code to solve the below question. You can use function fold to define the length
The problem of functional language: Coq. Need to use coq code to solve the below question.
You can use function fold to define the length of the list as follows:
Definition fold_length {X : Type} (l : list X) : nat :=
fold (fun _ n => S n) l 0.
Prove that fold_length and length compute the same value for any arbitrary list.
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