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A number defining one end of an interval on the real line. Each of the finite intervals [a, b], (a, b), [a, b) and (a, b] has two end-points, a and b. Each of the infinite intervals [a, ∞), (a, ∞), (−∞, a] and (−∞, a) has one end-point, a.

Subjects: Mathematics.

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