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Date: 2-5-2019
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Date: 19-9-2018
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A closed interval is an interval that includes all of its limit points. If the endpoints of the interval are finite numbers and , then the interval is denoted . If one of the endpoints is , then the interval still contains all of its limit points (although not all of its endpoints), so and are also closed intervals, as is the interval .
REFERENCES:
Croft, H. T.; Falconer, K. J.; and Guy, R. K. Unsolved Problems in Geometry. New York: Springer-Verlag, p. 1, 1991.
Gemignani, M. C. Elementary Topology. New York: Dover, 1990.
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