Definition:Point of Inflection

Definition
Let $f$ be a real function which is differentiable on an interval $\Bbb I \subseteq \R$.

Let $\xi \in \Bbb I$.

Also known as
A point of inflection can also be seen as inflection point.

An older spelling of inflection is inflexion.

Some sources give the term as a flex.

Also see

 * Equivalence of Definitions of Point of Inflection