"Source: Text/LieTheory/GrpLie.text";
"Line: 1833";
"Date: Fri Sep 26 12:10:11 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/LieTheory/GrpLie.text, line: 1833
// Example: H113E17 ()
print "Example: H113E17";
ei := GetEchoInput();
SetEchoInput(true);
G := GroupOfLieType("A4",Rationals());
PositiveRoots(G);
H := SubsystemSubgroup(G, [6,1,4]);
H;
PositiveRoots(H);
h := elt<H|<2,2>,1>;
h;  G!h;
SetEchoInput(ei);
