TITLE:
Diophantine Equations and the Freeness of Möbius Groups
AUTHORS:
Marin Gutan
KEYWORDS:
Diophantine Equation, Möbius Groups, Free Group
JOURNAL NAME:
Applied Mathematics,
Vol.5 No.10,
May
23,
2014
ABSTRACT: Let p and q be two fixed non zero integers verifying the condition gcd(p,q) = 1. We check solutions in non
zero integers a1,b1,a2,b2 and a3 for the following Diophantine equations: (B1) (B2) .
The equations (B1) and (B2) were considered by R.C. Lyndon and J.L. Ullman in [1] and A.F. Beardon in [2] in connection with the
freeness of the M?bius group generated by two matrices of namely and where .They proved that if one of the equations (B1) or (B2) has solutions in non zero integers then the group is not free. We give algorithms to decide if
these equations admit solutions. We obtain an arithmetical criteria on p and q for which (B1)
admits solutions. We show that for all p and q the equations (B1) and (B2) have only a
finite number of solutions.