simp [show a = 0 from by simpa [A] using sqrt_lt_sq a] at h
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 + 𝛀₁
a : M
h : 0 < a
A : √a = 0
⊢ False
no goals