I do not quite understand why this doesn't work.

%%% (225) -> M ==> MultivariatePolynomial(['a,'b], QQ)
Type: Void
%%% (226) -> C ==> Fraction R
Type: Void
%%% (227) -> R ==> MultivariatePolynomial(['a,'b], QQ)
Type: Void
%%% (228) -> C ==> Fraction R
Type: Void
%%% (229) -> U ==> Polynomial C
Type: Void
%%% (230) -> e1 := 1$U

   (230)  1
Type: Polynomial(Fraction(MultivariatePolynomial([a,b],Fraction(Integer))))
%%% (231) -> e1 + e1

   (231)  2
Type: Polynomial(Fraction(MultivariatePolynomial([a,b],Fraction(Integer))))
%%% (232) -> "x"::Symbol :: U

   Polynomial(Fraction(MultivariatePolynomial([a,b],Fraction(Integer)))
      ) is not a valid type.

%%% (232) -> u1: U := 1

   Polynomial(Fraction(MultivariatePolynomial([a,b],Fraction(Integer)))
      ) is not a valid type.

%%% (232) -> u1: U := 1$U

   Polynomial(Fraction(MultivariatePolynomial([a,b],Fraction(Integer)))
      ) is not a valid type.

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