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  "body": "\n## Summary\n\nIn algebra, the **bicommutant** of a [[subset|0BJR9QR08E]] *S* of a [[semigroup|0XMEM406JM]] (such as an algebra or a group) is the commutant of the commutant of that subset. It is also known as the double commutant or second commutant and is written $S^{\\prime \\prime}$.\n",
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