"Source: Text/LieTheory/RootSys.text";
"Line: 1491";
"Date: Fri Sep 26 12:10:11 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/LieTheory/RootSys.text, line: 1491
// Example: H106E17 ()
print "Example: H106E17";
ei := GetEchoInput();
SetEchoInput(true);
R1 := RootSystem("H4");
R2 := RootSystem("B4");
R1 + Dual(R2);
R := RootSystem("BC2");
I := IndivisibleSubsystem(R); I;
I subset R;
SetEchoInput(ei);
