Questions tagged [agda-stdlib]

I wrote a function to get everything but the last element of a List from std-lib: open import Data.List allButLast : ∀ {a} {A : Set a} → List A → List A allButLast [] = [] allButLast (x ∷ []) = [] allButLast (x ∷ xs) = x ∷ allButLast xs For…

I defined allButLast this way: allButLast : ∀ {a} {A : Set a} → List A → List A allButLast l.[] = l.[] allButLast list = l.reverse (tail' (l.reverse list)) and would like to prove the following statement: allButLast-∷ʳ : ∀ {a} {A : Set a} → …