no goals
α : Type u_1
a b : α
x✝² x✝¹ : Nat
x✝ : x✝² ≠ x✝¹
⊢ set (set [] x✝² a) x✝¹ b = set (set [] x✝¹ b) x✝² a
simp
no goals
α : Type u_1
a b : α
n : Nat
head✝ : α
tail✝ : List α
x✝ : n + 1 ≠ 0
⊢ set (set (head✝ :: tail✝) (n + 1) a) 0 b = set (set (head✝ :: tail✝) 0 b) (n + 1) a
simp [set]
no goals
α : Type u_1
a b : α
m : Nat
head✝ : α
tail✝ : List α
x✝ : 0 ≠ m + 1
⊢ set (set (head✝ :: tail✝) 0 a) (m + 1) b = set (set (head✝ :: tail✝) (m + 1) b) 0 a
simp [set]