"Source: Text/Commut/RngDiff.text";
"Line: 1157";
"Date: Thu Sep 25 14:47:46 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Commut/RngDiff.text, line: 1157
// Example: H121E20 ()
print "Example: H121E20";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
_<X> := PolynomialRing(F);
M := ext< F | X^2-2 >;
ConstantField(M);
_<x>:=PolynomialRing(Rationals());
C := NumberField(x^2-2);
Mext, toMext := ConstantFieldExtension(M, C);
ConstantField(Mext);
toMext;
SetEchoInput(ei);
