"Source: Text/Ring/RngSer.text";
"Line: 341";
"Date: Fri Sep 26 12:10:11 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Ring/RngSer.text, line: 341
// Example: H51E1 ()
print "Example: H51E1";
ei := GetEchoInput();
SetEchoInput(true);
Q := RationalField();
P<x> := PowerSeriesRing(Q);
PP := PowerSeriesRing(Q);   
P;
PP;
PP.1;
Pa<a> := PowerSeriesRing(Q: Global := false);
Pb<b> := PowerSeriesRing(Q: Global := false);
Pa;
Pb;
a;
b;
P;
x;
x eq a; // Automatic coercion
assert $1;
x + a;
SetEchoInput(ei);
