-- -*- M2-comint -*- hash: 8179722382128527075

i1 : R = QQ[x,y]

o1 = R

o1 : PolynomialRing

i2 : S = diffOpRing R

o2 = S

o2 : PolynomialRing

i3 : D = diffOp matrix{{x*dx}, {(y+1)*dx*dy}}

o3 = |    xdx    |
     | (y+1)dxdy |

                2
o3 : DiffOp in S

i4 : f = matrix{{x+y}, {x*y*(y+1)}}

o4 = | x+y    |
     | xy2+xy |

             2      1
o4 : Matrix R  <-- R

i5 : D f

       2
o5 = 2y  + x + 3y + 1

o5 : R

i6 : D = diffOp dx^2

o6 = | dx^2 |

                1
o6 : DiffOp in S

i7 : D(x^3+y*x^2)

o7 = 6x + 2y

o7 : R

i8 : 
