"Source: Text/Commut/RngDiff.text";
"Line: 1036";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 1036
// Example: H121E17 ()
print "Example: H121E17";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
Derivative(z^2 + 7/z);
Differential(z);
Differential(1/z+6+5*z);
S<t> := DifferentialLaurentSeriesRing(Rationals());
Derivative(5 + 2*t + 3*t^2);
SetEchoInput(ei);
