Definition:Serial Relation

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Let $\RR \subseteq S \times S$ be a relation in $S$.

$\RR$ is serial if and only if:

$\forall x \in S: \exists y \in S: \tuple {x, y} \in \RR$

That is, a relation $\RR \subseteq S \times S$ is serial if and only if every element of $S$ relates to some other element of $S$.

Also see

  • Results about serial relations can be found here.