"Source: Text/Commut/RngDiff.text";
"Line: 1208";
"Date: Wed Sep 19 23:00:01 2018";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/Commut/RngDiff.text, line: 1208
// Example: H118E22 ()
print "Example: H118E22";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
pl := Zeros(z)[1];
S<t>, mp := Completion(F,pl: Precision := 5);
IsDifferentialLaurentSeriesRing(S);
assert $1;
mp;
Domain(mp) eq F, Codomain(mp) eq S;
Derivation(S)(t);
assert $1 eq 1;
1/(1-t);
SetEchoInput(ei);
