"Source: Text/Commut/RngDiff.text";
"Line: 1935";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 1935
// Example: H121E35 ()
print "Example: H121E35";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
R<D> := DifferentialOperatorRing(F);
BaseRing(R) eq F;
assert $1;
Derivation(R);
Differential(R);
SetEchoInput(ei);
