simp [unpair, this, show ¬b ≤ a from by simpa using h]
case pos
M : Type u_1
inst✝⁶ : Zero M
inst✝⁵ : One M
inst✝⁴ : Add M
inst✝³ : Mul M
inst✝² : LT M
inst✝¹ : M ⊧ₘ* 𝐏𝐀⁻
inst✝ : M ⊧ₘ* 𝐈open
a b : M
h : a < b
this : √(b * b + a) = b
⊢ unpair (b * b + a) = (a, b)
no goals