Definition:Symmetric Relation/Definition 3

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Definition

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

$\mathcal R$ is symmetric if and only if it is a subset of its inverse:

$\mathcal R \subseteq \mathcal R^{-1}$


Also see

  • Results about symmetry of relations can be found here.


Sources