∀ {R : Type u} {S₁ : Type v} {σ : Type u_1} [inst : CommSemiring R] [inst_1 : CommSemiring S₁] [inst_2 : Algebra R S₁]
  (p : MvPolynomial σ R), (MvPolynomial.aeval fun x => 0) p = (algebraMap R S₁) (MvPolynomial.constantCoeff p)