"Source: Text/Commut/RngDiff.text";
"Line: 1405";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 1405
// Example: H121E27 ()
print "Example: H121E27";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
K<E> := ExponentialFieldExtension(F, z);
K;
Derivative(E);
_<L> := LogarithmicFieldExtension(F, 1/z);
Derivative(L);
Parent($1) eq Parent(L);
assert $1;
SetEchoInput(ei);
