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Action of a derivation
DerivationAction(Derivation:POLY, P:POLY)
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Given the polynomial P and the derivation D, computes the action of D on P.
For the sake of simplicity Forms/Polynomials and Derivations live in
the same ring, the distinction between them is purely formal.
/**/ Use R ::= QQ[x,y,z];
/**/ DerivationAction(x*y*z, x^3+x*y*z);
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