Subtracts two differential operators. The ring of both operators must match
i1 : R = QQ[x,y]; |
i2 : D = diffOp{x => x^2+ y}
2
o2 = (x + y)dx
o2 : DiffOp
|
i3 : E = diffOp{x => -y, x^2*y^2 => 2}
2 2
o3 = 2*dx dy - y*dx
o3 : DiffOp
|
i4 : D - E
2 2 2
o4 = - 2*dx dy + (x + 2y)dx
o4 : DiffOp
|