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Reflexive closure

In mathematics, the reflexive closure of a binary relationR{\displaystyle R} on a setX{\displaystyle X} is the smallest reflexive relation on X{\displaystyle X} that contains R{\displaystyle R}, i.e. the set R∪{(x,x)∣x∈X}{\displaystyle R\cup \{(x,x)\mid x\in X\}}.

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