"Source: Text/Commut/RngDiff.text";
"Line: 3296";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 3296
// Example: H121E58 ()
print "Example: H121E58";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
_<T> := PolynomialRing(Rationals());
R<D> := DifferentialOperatorRing(F);
H := (z^2-z)*D^2+(3*z-6)*D+1;
IndicialPolynomial(H, Zeros(z)[1]);
IndicialPolynomial(H, Zeros(z-1)[1]);
IndicialPolynomial(H, Zeros(1/z)[1]);
Apply(H, (z-1)^4/z^5);
assert $1 eq 0;
SetEchoInput(ei);
