# Definition:Convergent Mapping

## Definition

### Metric Space

Let $M_1 = \struct {A_1, d_1}$ and $M_2 = \struct {A_2, d_2}$ be metric spaces.

Let $c$ be a limit point of $M_1$.

Let $f: A_1 \to A_2$ be a mapping from $A_1$ to $A_2$ defined everywhere on $A_1$ *except possibly* at $c$.

Let $\map f x$ tend to the limit $L$ as $x$ tends to $c$.

Then $f$ **converges to the limit $L$ as $x$ tends to $c$**.

### Real Function

As the real number line $\R$ under the usual (Euclidean) metric forms a metric space, the definition also holds for real functions:

Let $f: \R \to \R$ be a real function defined everywhere on $A_1$ *except possibly* at $c$.

Let $\map f x$ tend to the limit $L$ as $x$ tends to $c$.

Then $f$ **converges to the limit $L$ as $x$ tends to $c$**.

### Complex Function

As the complex plane $\C$ under the usual (Euclidean) metric forms a metric space, the definition also holds for complex functions:

Let $f: \C \to \C$ be a complex function defined everywhere on $\C$ *except possibly* at $c$.

Let $\map f z$ tend to the limit $L$ as $z$ tends to $c$.

Then $f$ **converges to the limit $L$ as $z$ tends to $c$**.

## Also see

- Results about
**convergent mappings**can be found**here**.