Extreme value
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"Minimum" and "Maximum" redirect here. For minimum or maximum of a function, see maxima and minima.
The largest and the smallest element of a set are called extreme values.
For a differentiable function f, if f(x0) is an extreme value for the set of all values f(x), and if f(x0) is in the interior of the domain of f, then x0 is a critical point.