diffOp M
Creates a differential operator from a vector of polynomials in $S = \mathbb{K}[x_1,\dotsc,x_n][dx_1,\dotsc,dx_n]$. The ring $S$ is obtained from the ring $R = \mathbb{K}[x_1,\dotsc,x_n]$ by using diffOpRing.
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A ring element can be used instead of a $1 \times 1$ matrix.
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