Question

what are the rules of writing interval of sets?​

Answer 1

Answer:

Interval notation is a way of writing subsets of the real number line . A closed interval is one that includes its endpoints: for example, the set {x | −3≤x≤1} . An open interval is one that does not include its endpoints, for example, {x | −3<x<1} .

Answer 2

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Intervals are written with rectangular brackets or parentheses, and two numbers delimited with a comma. The two numbers are called the endpoints of the interval. The number on the left denotes the least element or lower bound. The number on the right denotes the greatest element or upper bound.

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