simp [log_two_mul_of_pos (show 0 < a + b from by simp [pos_of_nonempty hi])]
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
a b i : M
hi : i ∈ a
⊢ log (a + b) < log (2 * (a + b))
no goals