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1. (mathematics) Denotes a closed right endpoint of an interval.

   ${\displaystyle (a,b]=\{x\in \mathbb {R} \,|\,a<x\leq b\}}$ ,

2. (mathematics) Denotes an open left endpoint of an interval.

   ${\displaystyle \left]a,b\right]=\{x\in \mathbb {R} \,|\,a<x\leq b\}}$

3. Used in [ ].

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