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syukai
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Does ]-∞, ∞[ (can also be written as -∞<x<∞) mean all real numbers?
syukai said:Does ]-∞, ∞[ (can also be written as -∞<x<∞) mean all real numbers?
NoMoreExams said:I think the ] [ notation is used in other countries other than US.
mrandersdk said:You say
Does ]-∞, ∞[ (can also be written as -∞<x<∞) mean all real numbers?
first of all there is a difference between ]-∞, ∞[ and -∞<x<∞, the first is all the real numbers, the second is the same as [itex]x \in ]-∞, ∞[ [/itex]. You are right that ]-∞, ∞[ is all the real numbers, but an interval is defined from the real numbers, so that notation is rarely used.
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