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Mathlib.RingTheory.Kaehler.Polynomial

The Kaehler differential module of polynomial algebras #

The relative differential module of a polynomial algebra R[σ] is the free module generated by { dx | x ∈ σ }. Also see KaehlerDifferential.mvPolynomialBasis.

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    noncomputable def KaehlerDifferential.mvPolynomialBasis (R : Type u) [CommRing R] (σ : Type u_1) :

    { dx | x ∈ σ } forms a basis of the relative differential module of a polynomial algebra R[σ].

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      theorem KaehlerDifferential.polynomial_D_apply (R : Type u) [CommRing R] (P : Polynomial R) :
      (KaehlerDifferential.D R (Polynomial R)) P = Polynomial.derivative P (KaehlerDifferential.D R (Polynomial R)) Polynomial.X

      The relative differential module of the univariate polynomial algebra R[X] is isomorphic to R[X] as an R[X]-module.

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