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Some one asked me to use reverse square bracket instead of parenthesis (.,.) to denote open interval, and I have confused with meaning of reverse square bracket and the notation (denotation) of it. So, can I get your help to know the meaning of reverse square bracket, and how we denote it?

Alex Ravsky
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Tsegay
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    Do you mean $]\cdot,\cdot[$? Then $]a,b[ = (a,b)$, where the right hand side is your usual notation for an open interval. Similarly, $[a,b[ = [a,b)$, and so on. Personally I think it’s a nice way to avoid ambiguity about whether $(x,y)$ means the pair of objects consisting of $x$ and $y$, or the open interval contained between $x$ and $y$, but it is unfortunately not as commonly used as I’d like. ($\LaTeX$ doesn’t also seem to kern it properly.) – Theoretical Economist Oct 11 '19 at 14:47
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    @TheoreticalEconomist \mathopen]a,b\mathclose[ Also \mathrm{\LaTeX} to get $\mathrm{\LaTeX}$ in MathJax. – egreg Oct 11 '19 at 19:49
  • Thank you very much for your answer. My question is "what does reverse square bracket mean." Because, some journals ask to use reverse square bracket to denote the open interval (a,b), and I have confused with the meaning of reverse square bracket. – Tsegay Oct 14 '19 at 11:26

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