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  "body": "\n## Summary\n\nIn mathematics, the **reflexive closure** of a [[binary relation|05AVARPXA2]] $R$ on a [[set|0BSJ7RQ9BW]] $X$ is the smallest [[reflexive relation|0X8NMST0J2]] on $X$ that contains $R$, i.e. the set $R \\cup \\{(x,x) \\mid x \\in X \\}$.\n",
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