Introduction to Interval Notation

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Last updated 11:11 PM on 8/28/25
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11 Terms

1
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a method used to represent a set of real numbers between two intervals

Define Interval Notation


2
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a set of brackets

Endpoints are listed within?

3
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Closed intervals (intervals that include both endpoints)
Closed intervals (intervals that include both endpoints)
Square brackets [] indicate what type of interval?
4
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Open intervals (intervals that do not include either endpoint)
Open intervals (intervals that do not include either endpoint)
Rounded brackets () indicate what type of interval?
5
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With one square bracket and one rounded bracket
With one square bracket and one rounded bracket
How is a half-closed or half-open interval indicated?
6
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∞ with a rounded bracket
∞ with a rounded bracket
How is the upper endpoint written for sets with no upper boundary?
7
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−∞ with a rounded bracket
−∞ with a rounded bracket
How is the lower endpoint written for sets with no lower boundary?
8
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The number is part of the interval
The number is part of the interval
On a number line, what does a solid dot mean?
9
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The number is not part of the interval
The number is not part of the interval
On a number line, what does an open dot mean?
10
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With rounded brackets (since they are not defined endpoints)
With rounded brackets (since they are not defined endpoints)
How are −∞ or ∞ always listed in interval notation?
11
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Belongs to
Belongs to
What does the symbol ∈ mean?