∀ {R : Type r} {S : Type s} [inst : CommRing R] [inst_1 : CommRing S] {W : WeierstrassCurve.Affine R} (f : R →+* S),
  (WeierstrassCurve.map W f).toAffine.polynomialX = Polynomial.map (Polynomial.mapRingHom f) W.polynomialX