∀ {R : Type u_1} (S : Type u_2) [inst : CommRing R] [inst_1 : CommRing S] [inst_2 : Algebra R S] (r : R)
  [inst_3 : IsLocalization.Away r S],
  algebraMap (MvPolynomial Unit R) S = ↑(MvPolynomial.aeval fun x => IsLocalization.Away.invSelf r)