Open-interval meaning

A set of numbers consisting of all the numbers between a pair of given numbers but not including the endpoints.
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A set of numbers consisting of all the numbers between a pair of given numbers but not including the endpoints.
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(mathematics) An interval in the real number line which does not contain its supremum and infimum. If specified by a pair of real numbers, then it consists of all the points on the real line whose values lie strictly between those two real numbers.
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