∀ (n : Type v) (R : CommRingCat),
  AlgebraicGeometry.AffineSpace.SpecIso n R =
    AlgebraicGeometry.AffineSpace.isoOfIsAffine n (AlgebraicGeometry.Spec R) ≪≫
      AlgebraicGeometry.Scheme.Spec.mapIso
        (MvPolynomial.mapEquiv n
              (AlgebraicGeometry.Scheme.ΓSpecIso R).symm.commRingCatIsoToRingEquiv).toCommRingCatIso.op