"Source: Text/Commut/RngDiff.text";
"Line: 2437";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 2437
// Example: H121E43 ()
print "Example: H121E43";
ei := GetEchoInput();
SetEchoInput(true);
S<t> := DifferentialLaurentSeriesRing(Rationals());
RS<DS> := DifferentialOperatorRing(S);
L := (5-O(t))*DS^3+(2*t^-1+t^2+O(t^4))*DS - t^-2+t+O(t^3);
L;
TruncateCoefficients(L);
L -TruncateCoefficients(L);
SetEchoInput(ei);
