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Please look at: http://mathworld.wolfram.com/Interval.html
My question is about this line:
"If one of the endpoints is +-oo , then the interval still contains all of its limit points, so (-oo,b] and [a,oo) are also closed intervals".
How come ?
My question is about this line:
"If one of the endpoints is +-oo , then the interval still contains all of its limit points, so (-oo,b] and [a,oo) are also closed intervals".
How come ?
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