"Source: Text/Commut/RngDiff.text";
"Line: 3094";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 3094
// Example: H121E55 ()
print "Example: H121E55";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
R<D> := DifferentialOperatorRing(F);
L := D^3-z*D^2+2*D+5;
CompanionMatrix(L);
SetEchoInput(ei);
