"Source: Text/Commut/RngDiff.text";
"Line: 2485";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 2485
// Example: H121E44 ()
print "Example: H121E44";
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);
