"Source: Text/Commut/RngDiff.text";
"Line: 1828";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 1828
// Example: H121E34 ()
print "Example: H121E34";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
R<D> := DifferentialOperatorRing(F);
R.1;
R!(1/z);
R![1/2,0,5,z];
S<T> := DifferentialOperatorRing(ChangeDerivation(F,z));
R!T;
S!D;
SetEchoInput(ei);
