# Math Help - Prove that an algebraic integer is a unit in Z(a)

1. ## Prove that an algebraic integer is a unit in Z(a)

I'm completely stuck here, can anyone help me?

2. ## Re: Prove that an algebraic integer is a unit in Z(a)

What is the definition of "unit"?

3. ## Re: Prove that an algebraic integer is a unit in Z(a)

As I understand your question, this is a solution: