∀ {R : Type u_1} {S : Type u_2} (n : Type u_3) [inst : CommRing R] [inst_1 : CommRing S] [inst_2 : Fintype n]
  [inst_3 : DecidableEq n] (f : R →+* S) (M : n × n → S) (i : ℕ),
  (MvPolynomial.eval₂Hom f M) ((Matrix.charpoly.univ R n).coeff i) = (Matrix.of (Function.curry M)).charpoly.coeff i