"Source: Text/Commut/RngDiff.text";
"Line: 3595";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 3595
// Example: H121E64 ()
print "Example: H121E64";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
_<X> := PolynomialRing(F);
f := X^3-z;
L := DifferentialOperator(f);
L;
M<alpha> := ext<F|f>;
R<D> := DifferentialOperatorRing(M);
Apply(R!L,alpha);
assert $1 eq 0;
SetEchoInput(ei);
