Definition:Relational Closure
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Definition
Let $A$ be a class.
Let $\RR \subseteq A \times A$ be a relation.
Let $x$ be a small class that is a subset of $A$.
The relational closure of $x$ is the smallest small class containing $x$ that is also $\RR$-transitive.
Also see
- Results about relational closures can be found here.