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Difference between Codomain and Range

Difference between Codomain and Range

In mathematics, a function is a set of ordered pairs, where each element in the set corresponds to a unique output. In other words, every input has a specific output that is determined by the function. There are two key terms that are associated with functions: codomain and range. The codomain refers to the set of all outputs for a given function, while the range refers to the set of all inputs that will produce a specific output. It’s important to understand the difference between these two sets, as they can have a significant impact on how you approach solving problems.

What is Codomain?

In mathematics, the codomain of a function is the set into which all of the output of the function is constrained to fall. The codomain is also sometimes known as the “range” of the function. Formally, the codomain is defined as the set of all possible outputs of the function.

  • Usually, the codomain is a superset of the function’s actual range (the set of all outputs that actually occur when the function is executed). For example, if a function takes input from a set A and outputs values from a set B, then B is typically referred to as the codomain of the function, while the range is simply the set of all values that are actually output by the function when given inputs from A.
  • In many cases, the codomain and range will be equal, but this is not always the case. Codomain is a useful concept in mathematics because it allows for functions to be described more completely without having to enumerate all of their possible outputs.
  • This can be especially helpful when dealing with infinite sets. Codomains also play an important role in certain areas of mathematics, such as topology and functional analysis.

What is Range?

Range is a measure of how spread out numbers are in a data set. It is calculated by taking the difference between the largest and smallest values in the data set.

  • Range is a very useful tool for understanding how data is distributed. For example, if you know that the range of a data set is small, you can be confident that most of the values are clustered close together.
  • On the other hand, if the range is large, it indicates that the values are more spread out. Range can be a helpful tool for spotting outliers, which are values that lie far outside the rest of the data.
  • Outliers can often be caused by errors in data entry, and so Range can be used to identify and correct these errors. Range is also sometimes referred to as dispersion or variability.

Difference between Codomain and Range

In mathematics, the terms Codomain and Range are commonly used interchangeably. However, there is a subtle but important distinction between the two. Codomain refers to the set of all possible outputs of a function, while Range refers to the set of all actual outputs of a function. In other words, Codomain is the set of all possible values that a function could output, while Range is the set of all actual values that a function does output.

For example, consider the function f(x) = x^2. The Codomain of this function is all real numbers, since any real number can be output by squaring some other real number. However, the Range of this function is only non-negative real numbers, since negative numbers cannot be squared to yield a positive result. This distinction can be useful in understanding and analyzing functions.


Codomain and Range are two important concepts in mathematics that you should understand. The codomain of a function is the set of all outputs that the function can produce, while the range is the set of all inputs that will result in an output. It’s important to be able to identify both the codomain and range for a given function, as they can help you determine whether or not a function is defined for a particular input value. In addition, understanding these concepts can help you solve problems more effectively and efficiently.

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