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Closed Interval -- from Wolfram MathWorld

A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers a and b, then the interval {x:a<=x<=b} is denoted [a,b]. If one of the endpoints is +/-infty, then the interval still contains all of its limit points (although not all of its endpoints), so [a,infty) and (-infty,b] are also closed intervals, as is the interval (-infty,infty).



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Closed Interval -- from Wolfram MathWorld

https://mathworld.wolfram.com/ClosedInterval.html

A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers a and b, then the interval {x:a<=x<=b} is denoted [a,b]. If one of the endpoints is +/-infty, then the interval still contains all of its limit points (although not all of its endpoints), so [a,infty) and (-infty,b] are also closed intervals, as is the interval (-infty,infty).



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https://mathworld.wolfram.com/ClosedInterval.html

Closed Interval -- from Wolfram MathWorld

A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers a and b, then the interval {x:a<=x<=b} is denoted [a,b]. If one of the endpoints is +/-infty, then the interval still contains all of its limit points (although not all of its endpoints), so [a,infty) and (-infty,b] are also closed intervals, as is the interval (-infty,infty).

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      Closed Interval -- from Wolfram MathWorld
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      A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers a and b, then the interval {x:a<=x<=b} is denoted [a,b]. If one of the endpoints is +/-infty, then the interval still contains all of its limit points (although not all of its endpoints), so [a,infty) and (-infty,b] are also closed intervals, as is the interval (-infty,infty).
    • description
      A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers a and b, then the interval {x:a<=x<=b} is denoted [a,b]. If one of the endpoints is +/-infty, then the interval still contains all of its limit points (although not all of its endpoints), so [a,infty) and (-infty,b] are also closed intervals, as is the interval (-infty,infty).

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      Closed Interval -- from Wolfram MathWorld
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      A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers a and b, then the interval {x:a<=x<=b} is denoted [a,b]. If one of the endpoints is +/-infty, then the interval still contains all of its limit points (although not all of its endpoints), so [a,infty) and (-infty,b] are also closed intervals, as is the interval (-infty,infty).

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      Closed Interval -- from Wolfram MathWorld
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      A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers a and b, then the interval {x:a<=x<=b} is denoted [a,b]. If one of the endpoints is +/-infty, then the interval still contains all of its limit points (although not all of its endpoints), so [a,infty) and (-infty,b] are also closed intervals, as is the interval (-infty,infty).
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