Difference between Open Interval and Closed Interval

Characteristics

Open Interval

Closed Interval

Definition

An interval that does not include the endpoints is called an open interval.

An interval that includes the endpoints is called a closed interval.

Brackets

Open interval uses parenthesis.

Closed interval uses square brackets.

Representation

It is represented as (a, b).

It is represented as [a, b].

Example

An example of open interval is 2 < x < 9.

An example of closed interval is 2 ≤ x ≤ 9.

Interval Notation

Interval notation is a method used to represent continuous sets of real numbers by specifying their boundaries. Written intervals resemble ordered pairs but are not used to indicate specific points. Instead, they serve as a concise means to express inequalities or systems of inequalities, providing a shorthand form to describe the range of values within those boundaries.

Interval notation helps in classifying a range of numbers as a single representation which makes it easier to understand the numeric representation in mathematical terms.

In this article, we will discuss Interval Notation in detail including the different types of interval notations and their representations along with solved examples and practice problems.

Table of Content

  • What is Interval Notation in Maths?
  • Interval Notation Examples
  • Interval Notation for Real Numbers
  • Interval Notation for Inequalities
  • Interval Notation as Set
  • Interval Notation for Domain
  • Interval Notation for Range
  • Types of Intervals
    • Closed Intervals
    • Open Intervals
    • Half-Open Intervals
    • Infinite Intervals
  • Difference between Open Interval and Closed Interval
  • Number line Representation of Different Types of Graphs
  • Applications of Interval Notation
  • Solved Examples on Interval Notation
  • Practice Problems on Interval Notation

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What is Interval Notation in Maths?

Interval notation is a concise and effective way to represent intervals or sets of real numbers on the number line between two defined points on the real line. It uses brackets, parentheses, and inequalities to denote the boundaries and characteristics of the interval, making it a valuable tool in mathematics and other fields. Interval notation simplifies the expression of relationships between numbers within a given range, enhancing our ability to work with inequalities and intervals in a clear and standardized manner....

Interval Notation Examples

Let’s consider a scenario where we aim to convey the assortment of real values {y | -4 < y < 6} using interval notation. This can be presented as (-4, 6)....

Interval Notation for Real Numbers

Interval notation is a concise method for representing ranges of real numbers using brackets, parentheses, and inequalities. It helps express the continuum of real numbers and simplifies the communication of mathematical ideas involving intervals....

Interval Notation for Inequalities

Interval notation is a powerful tool to convey inequalities by indicating the boundaries and characteristics of a range of values. It streamlines the representation of inequalities in a standardised and intuitive format....

Interval Notation as Set

Interval notation can be seen as a way to represent sets of real numbers, offering a clear and uniform method to define and describe these sets, enhancing our ability to work with them in various mathematical contexts....

Interval Notation for Domain

In mathematics, interval notation is commonly used to denote the domain of a function, helping specify the set of input values for which the function is defined. It simplifies the description of these input intervals....

Interval Notation for Range

Similar to its use in describing domains, interval notation can represent the range of a function, providing a concise and precise way to express the set of output values produced by the function over certain intervals of the domain....

Types of Intervals

Intervals may be categorized depending on the numerical content of the collection. Certain collections encompass the designated terminal points within the notation, whereas others might encompass the endpoints partially or not at all. Below classifications of intervals are recognized:...

Difference between Open Interval and Closed Interval

Characteristics Open Interval Closed Interval Definition An interval that does not include the endpoints is called an open interval. An interval that includes the endpoints is called a closed interval. Brackets Open interval uses parenthesis. Closed interval uses square brackets. Representation It is represented as (a, b). It is represented as [a, b]. Example An example of open interval is 2 < x < 9. An example of closed interval is 2 ≤ x ≤ 9....

Number line Representation of Different Types of Graphs

Open Interval Notation: Below is the open interval representation of (-2, 3)....

Applications of Interval Notation

Applications of Interval Notation include the following:...

Solved Examples on Interval Notation

Example 1. Determine if 2.5 in the open interval (1, 5)....

Practice Problems on Interval Notation

Q1: Determine if 0 is in the closed interval [-2, 3] ?...

Conclusion of Interval Notation

Interval notation is a method used in mathematics to describe a range of real numbers between two endpoints on a number line. It uses brackets and parentheses to indicate whether the endpoints are included or excluded from the interval. For example, the notation [a,b] includes both endpoints a and b, while (a,b) excludes them. This notation helps clearly define sets of numbers, such as the domain or range of functions, and is useful for expressing and solving inequalities. It also distinguishes between different types of intervals, such as open, closed, half-open, and infinite intervals, each serving to accurately describe numerical ranges in various mathematical contexts....

Interval Notation – FAQs

What is the Purpose of Interval Notation?...