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Math Help - Unfamiliar use of interval brackets

  1. #1
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    Unfamiliar use of interval brackets

    Hey, I was wondering if anyone could clear up for me what would generally be meant when you say that a certain value has to

    "lie within the strip ] x , y ["? What exactly does it signify when the brackets are in the opposite direction as compared to how you would indicate a closed interval from x to y, [x,y]?
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  2. #2
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    Re: Unfamiliar use of interval brackets

    Quote Originally Posted by Scurmicurv View Post
    Hey, I was wondering if anyone could clear up for me what would generally be meant when you say that a certain value has to
    "lie within the strip ] x , y ["? What exactly does it signify when the brackets are in the opposite direction as compared to how you would indicate a closed interval from x to y, [x,y]?
    That notation is unusual but not unheard of.
    ]a,b[=\{x: a<x<b\}=(a,b),
    ]a,b]=\{x: a<x\le b\}=(a,b] ,
    etc.
    Thanks from Melody2, Scurmicurv and Shakarri
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  3. #3
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    Re: Unfamiliar use of interval brackets

    Aha, so it's just an open interval? Thanks, that helps a lot to get that cleared up!
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