# Category:Maximum Value of Real Function

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This category contains results about Maximum Value of Real Function.

Definitions specific to this category can be found in Definitions/Maximum Value of Real Function.

### Absolute Maximum

Let $f: \R \to \R$ be a real function.

Let $f$ be bounded above by a supremum $B$.

It may or may not be the case that $\exists x \in \R: \map f x = B$.

If such a value exists, it is called the **maximum** of $f$ on $S$, and that this **maximum** is **attained at $x$**.

### Local Maximum

Let $f$ be a real function defined on an open interval $\openint a b$.

Let $\xi \in \openint a b$.

Then $f$ has a **local maximum at $\xi$** if and only if:

- $\exists \openint c d \subseteq \openint a b: \forall x \in \openint c d: \map f x \le \map f \xi$

That is, if and only if there is some subinterval on which $f$ attains a maximum within that interval.

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