exact Eq.symm <| this h₂ h₁ (show y₂ ≤ y₁ from le_of_not_ge h)
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
x y₁ y₂ : M
h₁ : Exponential x y₁
h₂ : Exponential x y₂
this :
  ∀ {M : Type u_1} [inst : Zero M] [inst_1 : One M] [inst_2 : Add M] [inst_3 : Mul M] [inst_4 : LT M]
    [inst_5 : M ⊧ₘ* 𝐈𝚫₀] {x y₁ y₂ : M}, Exponential x y₁ → Exponential x y₂ → y₁ ≤ y₂ → y₁ = y₂
h : ¬y₁ ≤ y₂
⊢ y₁ = y₂
no goals