rw [Nat.mul_comm, Nat.shiftLeft_one]
n : Nat
h_ind :
  ∀ {i : Nat},
    getBit (Nat.lsb (n / 2 + 1)) i = true ↔
      getBit (n / 2 + 1) i = true ∧ ∀ (j : Nat), j < i → getBit (n / 2 + 1) j = false
i : Nat
heven : n % 2 = 0
⊢ (n / 2 + 1) * 2 = (n / 2 + 1) <<< 1
no goals