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