"Source: Text/Commut/RngDiff.text";
"Line: 2305";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 2305
// Example: H121E40 ()
print "Example: H121E40";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
R<D> := DifferentialOperatorRing(F);
L := D^3  + (-4*z + 5)*D + (3*z - 4);
L;
Eltseq(L);
LeadingTerm(L);
Terms(L);
SetEchoInput(ei);
