no goals
α : Type ?u.1062538
n : ℤ
⊢ ↑↑0 = 0
simp
no goals
α : Type ?u.1062538
n : ℤ
⊢ ∀ (k : ℤ), 0 ≤ k → ↑↑k = k → ↑↑(k + 1) = k + 1
simp
no goals
α : Type ?u.1062538
n : ℤ
⊢ ∀ (k : ℤ), k ≤ 0 → ↑↑k = k → ↑↑(k - 1) = k - 1
simp