"Source: Text/Commut/RngDiff.text";
"Line: 1334";
"Date: Wed Sep 19 23:00:01 2018";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/Commut/RngDiff.text, line: 1334
// Example: H118E25 ()
print "Example: H118E25";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
R<D> := DifferentialOperatorRing(F);
L := z^2*D^2-1;
M<Y,DY> := DifferentialFieldExtension(L);
IsDifferentialField(M);
assert $1;
Derivative(Y);
Derivative(DY);
SetEchoInput(ei);
