"Source: Text/Group/GrpAtc.text";
"Line: 1686";
"Date: Wed Mar 24 19:05:07 2021";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/Group/GrpAtc.text, line: 1686
// Example: H82E21 ()
print "Example: H82E21";
ei := GetEchoInput();
SetEchoInput(true);
F<a, b>:= FreeGroup(2);
ish, dehn, D1, D2:= IsHyperbolic(F, [b^3], [a^2, (a*b)^7]);
ish, dehn;
isid, wd := IsIdentity((a*b^2)^6,D1);
isid, wd;
isid, wd := IsIdentity(b^-1*(a*b^2)^6*a,D1);
isid, wd;
SetEchoInput(ei);
