On 28.01.2013 10:21, Alexey U. Gudchenko wrote:

> M Dx = Dx M

Will correct that, under this formula, I could see construction of a
differential operator and not the applying  of differential operators to
the constant matrix (which obviously result in zero).


That is I meant that

[ a  0 ]       [ (a Dx)     0 ]
[      ]  Dx = [              ]
[ 0  a ]       [ 0      (a Dx)]


And then

> (M Dx) A(x) = Dx (M A(x))

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