exact bexp_eq_of_exp (by simp [length_two_mul_add_one, h]) (exp_bexp_of_lt h).succ
case inr
M : Type u_1
inst✝⁵ : Zero M
inst✝⁴ : One M
inst✝³ : Add M
inst✝² : Mul M
inst✝¹ : LT M
inst✝ : M ⊧ₘ* 𝐈𝚫₀
a i : M
h : i < ‖a‖
⊢ bexp (2 * a + 1) (i + 1) = 2 * bexp a i
no goals