rw [Order.lex]
n✝ : ℕ
v₁ v₂ : Vector ℕ n✝
h✝ : algebra.Order.ble_lex_impl v₁ v₂ = true
m : ℕ
a b : Vector ℕ m
h : algebra.Order.ble_lex_impl a b = true
⊢ lex a b
n✝ : ℕ
v₁ v₂ : Vector ℕ n✝
h✝ : algebra.Order.ble_lex_impl v₁ v₂ = true
m : ℕ
a b : Vector ℕ m
h : algebra.Order.ble_lex_impl a b = true
⊢ lex_impl a b