"Source: Text/LieTheory/GrpCox.text";
"Line: 2179";
"Date: Wed Nov  6 12:03:34 2019";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/LieTheory/GrpCox.text, line: 2179
// Example: H105E28 ()
print "Example: H105E28";
ei := GetEchoInput();
SetEchoInput(true);
W := CoxeterGroup("B3");
act := CorootAction(W);
act([1,-2,1], W.1);           
SetEchoInput(ei);
