"Source: Text/Commut/RngDiff.text";
"Line: 943";
"Date: Wed Sep 19 23:00:01 2018";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/Commut/RngDiff.text, line: 943
// Example: H118E14 ()
print "Example: H118E14";
ei := GetEchoInput();
SetEchoInput(true);
F<z> := RationalDifferentialField(Rationals());
_<X> := PolynomialRing(F);
K<x>, mp := ext<F|X^2+X+1>;
seq := Eltseq(x^2); 
seq;
Universe(seq) eq F;
assert $1;
SetEchoInput(ei);
