Find the congruence classes in .
I'm having trouble on this one. I don't know where to start.
I don't think its a typo, but I copied it exactly how the problem is written. I'm not sure if it makes any difference, but I think the problem assumes that we're only dealing with quadratic integers in .
My book gives the following definition for divisibility in :
If and are integers in , with , we say that divides if there is an integer in such that .