The following website explains that an upper bound of the interval $[0, 1, 2, 3, 4, 5, 6]$ are numbers $1, 2, 3, 4, 5, 6$. I though an upper bound was a number that is greater or equal to every number in that set so $6,7,8$ etc. Is the website wrong?
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1That does look to me like an error on that page – Henry May 29 '19 at 08:00
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The website looks sloppy to me. In the first place I do not even recognize any set in the notation $[0,1,2,3,4,5,6]$. Secondly, if they mean the set ${1,2,3,4,5,6}$ then $1,2,3,4,5$ are no upper bounds of it. Thirdly this set is not an interval. – drhab May 29 '19 at 08:00
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@drhab It is supposed to mean an interval, but I do not see how that changes things. – Michael Munta May 29 '19 at 08:02
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Also if they mean the interval $[0,6]$ then I do not understand the notation, and also then $1,2,3,4,5$ are no upper bounds. – drhab May 29 '19 at 08:03