∀ {F : Type u} [inst : Field F] (W : WeierstrassCurve.Jacobian F) [inst_1 : DecidableEq F] (a : W.toAffine.Point),
  (WeierstrassCurve.Jacobian.Point.toAffineAddEquiv W).symm a = WeierstrassCurve.Jacobian.Point.fromAffine a