intros i INBOUND
α : Type
x' : α
xs : List α
IH : ∀ (i : ℕ) (INBOUND : i < length xs), Mem (getF xs i INBOUND) xs
⊢ ∀ (i : ℕ) (INBOUND : i < length (x' :: xs)), Mem (getF (x' :: xs) i INBOUND) (x' :: xs)
α : Type
x' : α
xs : List α
IH : ∀ (i : ℕ) (INBOUND : i < length xs), Mem (getF xs i INBOUND) xs
i : ℕ
INBOUND : i < length (x' :: xs)
⊢ Mem (getF (x' :: xs) i INBOUND) (x' :: xs)