Hello all!

I was looking over some examples of congruence classes and I ran into one I could not find.

1.Is there/Are therea congruence class(es) in ? If so, what are they? I'm not sure if they exist or not even.

2. If is a quadratic integer in , then a notion of congruence can be defined.can this be defined how can we further define +, -, and x for congruences classes?How

Thank you everyone!

-Samson