Definition:Quasi-Reflexive Relation/Definition 3

Definition

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

$\RR$ is quasi-reflexive if and only if $\RR$ is both left quasi-reflexive and right quasi-reflexive.

Also see

• Equivalence of Definitions of Quasi-Reflexive Relation

• Definition:Left Quasi-Reflexive Relation
• Definition:Right Quasi-Reflexive Relation

• Results about quasi-reflexive relations can be found here.