Intervals which expands indefinitely in both the directions are known as unbounded intervals.

1. (a,infinity) is the set of all real numbers x such that a < x.

2. (–infinity, a) is the set of all real numbers x such that x < a.

3. [a, +infinity) is the set of all real numbers x such that a <= x.

4. (–infinity, a] is the set of all real numbers x such that x <= a.

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