Definition:Reflexive Transitive Closure/Reflexive Closure of Transitive Closure

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Definition

Let $\mathcal R$ be a relation on a set $S$.

The reflexive transitive closure of $\mathcal R$ is denoted $\mathcal R^*$, and is defined as the reflexive closure of the transitive closure of $\mathcal R$:

$\mathcal R^* = \left({\mathcal R^+}\right)^=$