# suggest a course on differential operator and Weyl

Can someone suggest me a course in pdf or textbook about differential operator and Weyl algebra. let $$R$$ a commutative algebra over a field $$k$$ let M, N two R-modules. we define the set of differential operator of M in N by:

$$\mathcal{D}_{R}^{0} (M, N ) = \operatorname{Hom}_{R}(M , N )$$ and $$\mathcal{D}_{R}^{n}(M, N )=\{ u ∈ \operatorname{Hom}_{k} (M, N ) : [u,a]=u · a − a · u ∈\mathcal{D}_{R}^{n-1}(M, N ) ,∀a ∈ R\}$$