-- -*- M2-comint -*- hash: 4987098790863018289

i1 : R = QQ[x,y];

i2 : S = diffOpRing R;

i3 : D = diffOp(x*dx+y*dy^3)

o3 = | ydy^3+xdx |

                1
o3 : DiffOp in S

i4 : evaluate(D, point{{1,2}})

o4 = | 2dy^3+dx |

                1
o4 : DiffOp in S

i5 : 
