exact lenbit_iff_add_mul (exp_pow2 i) (a := a)
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* 𝐈𝚺₁
i a : M
⊢ Bit i a ↔ ∃ k, ∃ r < exp i, a = k * (2 * exp i) + exp i + r
no goals