# Maximum and minimum

largest and smallest value taken by a function in a given range
(Redirected from Maximum)

In mathematics, the maximum and minimum of a set A is the largest and smallest element of A. They are written as ${\displaystyle \max(A)}$ and ${\displaystyle \min(A)}$, respectively.[1] Similarly, the maximum and minimum of a function are the largest and smallest value that the function takes at a given point.[2][3][4] Together, they are known as the extrema (the plural of extremum).[5]

Minimum means the least you can do of something. For example, if the minimum amount of dollars you must pay for something is seven, then you cannot pay six dollars or less (you must pay at least seven). You can do more than the minimum, but no less. Maximum means the most you can have of something. For example, if the maximum amount of oranges you can juggle is five, you cannot juggle more than five oranges. You can do the maximum or less.

For a differentiable function ${\displaystyle f}$, if ${\displaystyle f(x_{0})}$ is an extreme value for the set of all values ${\displaystyle f(x)}$, and if ${\displaystyle x_{0}}$ is in the interior of the domain of ${\displaystyle f}$, then ${\displaystyle x_{0}}$ is a critical point, by Fermat's theorem.[6][7]

## References

1. "List of Calculus and Analysis Symbols". Math Vault. 2020-05-11. Retrieved 2020-08-30.
2. Stewart, James (2008). Calculus: Early Transcendentals (6th ed.). Brooks/Cole. ISBN 978-0-495-01166-8.
3. Larson, Ron; Edwards, Bruce H. (2009). Calculus (9th ed.). Brooks/Cole. ISBN 978-0-547-16702-2.
4. Thomas, George B.; Weir, Maurice D.; Hass, Joel (2010). Thomas' Calculus: Early Transcendentals (12th ed.). Addison-Wesley. ISBN 978-0-321-58876-0.
5. Weisstein, Eric W. "Extremum". mathworld.wolfram.com. Retrieved 2020-08-30.
6. Weisstein, Eric W. "Maximum". mathworld.wolfram.com. Retrieved 2020-08-30.
7. Weisstein, Eric W. "Minimum". mathworld.wolfram.com. Retrieved 2020-08-30.