Definition:Quasi-Reflexive Relation/Definition 3

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

$\RR$ is quasi-reflexive $\RR$ 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