"Source: Text/Group/GrpAtc.text";
"Line: 1642";
"Date: Thu Sep 25 14:47:45 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Group/GrpAtc.text, line: 1642
// Example: H84E20 ()
print "Example: H84E20";
ei := GetEchoInput();
SetEchoInput(true);
F<a, b>:= FreeGroup(2);
ish, dehn, D1, D2:= IsHyperbolic(F, [b^3], [a^2, (a*b)^7]: epsilon:= 1/5);
ish, dehn;
D1;
ish, dehn, D1, D2:= IsHyperbolic(F, [b^3], [a^2, (a*b)^7]: epsilon:= 1/6);
ish, dehn;                                                   
SetEchoInput(ei);
