let k := n-2
m : Nat
h_ind : ∀ {n : Nat}, m / 2 + 1 ≤ n → log2' (m / 2 + 1) ≤ log2' n
n : Nat
h : m + 2 ≤ n
⊢ log2' (m + 2) ≤ log2' n
m : Nat
h_ind : ∀ {n : Nat}, m / 2 + 1 ≤ n → log2' (m / 2 + 1) ≤ log2' n
n : Nat
h : m + 2 ≤ n
k : Nat := n - 2
⊢ log2' (m + 2) ≤ log2' n