Definition:Circular Relation

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Definition

Let $\mathcal R \subseteq S \times S$ be a relation in $S$.


$\mathcal R$ is circular if and only if:

$\left({x, y}\right) \in \mathcal R \land \left({y, z}\right) \in \mathcal R \implies \left({z, x}\right) \in \mathcal R$


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