simpa [show y = y' from by simpa using e] using h
case intro.intro
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 y : M
h✝ : Exponential (2 * x) (y ^ 2)
y' : M
e : y ^ 2 = y' ^ 2
h : Exponential x y'
⊢ Exponential x y
no goals