| #### D.15.3.28 difformUnivDer Procedure from library `difform.lib` (see difform_lib). Usage: difformUnivDer(f); f poly Return: a differential form: the image of the universal derivation applied to f Example:
    LIB "difform.lib";
    ring R = 0,(x,y,z),lp;
    diffAlgebra();
    ==> // The differential algebra Omega_R was constructed and the differential \
       forms dDx, dDy, dDz, dx, dy, dz are available.
    /////////////////////////////////////////////////
    // Universal derivation applied to polynomials //
    /////////////////////////////////////////////////
    difformUnivDer(3x);
    ==> 3*dx
    ==>
    difformUnivDer(xyz+x2y2z2);
    ==> (2xy2z2+yz)*dx+(2x2yz2+xz)*dy+(2x2y2z+xy)*dz
    ==>
    difformUnivDer(x+y+z);
    ==> dx+dy+dz
    ==>
    kill Omega_R,dx,dy,dz;
See also: difformDiff.

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