Recent content by razorg425

Jeez i can't even do that. Im having a terrible day with this.

Sorry Rochfor, I actually can't prove that, I know it should be true as gcd(3,7)=1. A little more help please? Thanks.

Hi guys just a quick question on how I would go about showing the units of Z21 is isomorphic toC2*C6(cyclic groups).I have done out the multiplicative table but they seem to be different to me. What else can I do?