intro b n hb ih
case hi
n : ℕ
⊢ ∀ (b : Bool) (n : ℕ), (n = 0 → b = true) → size n ≤ log 2 n + 1 → size (bit b n) ≤ log 2 (bit b n) + 1
case hi
n✝ : ℕ
b : Bool
n : ℕ
hb : n = 0 → b = true
ih : size n ≤ log 2 n + 1
⊢ size (bit b n) ≤ log 2 (bit b n) + 1