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Almost symbolic computations (?)

Dear MathGroup

This is an example of the problem
I'm facing.

The code

   Head /@ {ax, ay, az}
   A = {ax, ay, az};


{Symbol, Symbol, Symbol}
{0, 0, 0}

Instead, I would get the
well known symbolic form

d_y az - d_z ay

I have been trying, for
a while, to perform string
manipulations but that,
of course, lays to ashes
the possibility to recognize

d_y az + d_y az = 2 d_y az

and so on.

Any way to get out of it ?

Kind regards

Barbara Da Vinci

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