The Stacks project

Definition 10.120.1. Let $R$ be a domain.

  1. Elements $x, y \in R$ are called associates if there exists a unit $u \in R^*$ such that $x = uy$.

  2. An element $x \in R$ is called irreducible if it is nonzero, not a unit and whenever $x = yz$, $y, z \in R$, then $y$ is either a unit or an associate of $x$.

  3. An element $x \in R$ is called prime if the ideal generated by $x$ is a prime ideal.

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