"Source: Text/Commut/RngDiff.text";
"Line: 2755";
"Date: Wed Sep 19 23:00:01 2018";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/Commut/RngDiff.text, line: 2755
// Example: H118E49 ()
print "Example: H118E49";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
R<D> := DifferentialOperatorRing(F);
pl := Zeros(z)[1];
Rcompl<Dcompl>, mp := Completion(R,pl);
IsDifferentialOperatorRing(Rcompl);
assert $1;
S<t> := BaseRing(Rcompl);
IsDifferentialLaurentSeriesRing(S);
assert $1;
mp(D);
Dcompl*t;
SetEchoInput(ei);
