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Interval Notation


	A real interval is shown graphically and described in words, as a set, and in interval notation. (There is no interval notation for the empty set.) Here is a summary:


	Contributed by: George Beck

The case

is suppressed in this Demonstration. In that case, the interval is empty unless

and

are both included, the set is bounded, closed, and is the one element set

(or

), and the interval is [a,a].

Contributed by: George Beck

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