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Summary

The codomain is the set of values that could possibly come out of a function, and is part of the definition of the function.
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The range is the set of values that actually do come out of the function.
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Range is sometimes used as a synonym for codomain, but it is actually a subset of the codomain.
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Summaries from the best pages on the web

Summary
The Codomain is the set of values that could possibly come out. The Codomain is actually part of the definition of the function.
And The Range is the set of values that actually do come out.
Example: we can define a function f(x)=2x with a domain and codomain of integers (because we say so).

Domain, Range and Codomain - Math is Fun
mathsisfun.com

Summary
The term range is often used as codomain, however, in a broader sense, the term is reserved for the subset of the codomain. In simple terms, range is the set of all output values of a function and function is the correspondence between the domain and the range.

Difference Between Codomain and Range
differencebetween.net

The difference between domain and range are somewhat obvious, but the difference between a codomain and range are subtle. More concretly, the codomain is the set of values that could…

Range, Domain, and Codomain | Kevin Sookocheff
sookocheff.com

Domain, Codomain , and Range Center of Math 39.8K subscribers 83K views 7 years ago As part of the college algebra series, this video clears up the differences between codomain and…

Domain, Codomain, and Range - YouTube
youtube.com

Main Differences Between Codomain and Range Codomain can be defined as the set of the possible values of a function, while Range can be defined as the most accurate value…

Difference Between Codomain and Range
askanydifference.com