Definition:Reflexive Reduction

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Let $\RR$ be a relation on a set $S$.

The reflexive reduction of $\RR$ is denoted $\RR^\ne$, and is defined as:

$\RR^\ne := \RR \setminus \set {\tuple {x, x}: x \in S}$

Also see

From Set Difference as Intersection with Relative Complement and Intersection is Largest Subset, it follows that $\RR^\ne$ is the largest antireflexive relation on $S$ which is contained in $\RR$.

Thus if $\RR$ is antireflexive, then $\RR = \RR^\ne$.

  • Results about reflexive reductions can be found here.