"Source: Text/Commut/RngDiff.text";
"Line: 2485";
"Date: Wed Sep 19 23:00:01 2018";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/Commut/RngDiff.text, line: 2485
// Example: H118E44 ()
print "Example: H118E44";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
R<D> := DifferentialOperatorRing(F);
L := D^2-2/z^2;
Apply(L, z);
L(z);
Apply(L, z^2);
assert $1 eq 0;
SetEchoInput(ei);
