A closed interval is a closed set connected on a straight line.
Because it is a bounded closed set, it is compact.
The function of closed interval is less than or equal to -∞≤ A ≤ +∞.
It is a real point on the number axis.
The complement set of a closed interval is the union set of two open intervals.
There is a famous closed interval set theorem in real number theory, see mathematical analysis for details.
Representative symbol: a number between 3 (inclusive) and 5 (inclusive).
Reference link: Closed interval _ Baidu Encyclopedia
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