1. The problem statement, all variables and given/known data [PLAIN]http://img541.imageshack.us/img541/9880/34132542.gif [Broken] 3. The attempt at a solution For part (a), I think since the order of an element g is the smallest integer n such that gn=e, we will have: 8n mod 65 = 1 => n=4 64n mod 65 = 1 => n=2 14n mod 65 =1 => n=2 Am I right so far? Now for part (b), what is it meant by an "isomorphic type"? And what do I need to do?