# Definition:Polynomial Function/Ring/Definition 2

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## Definition

Let $R$ be a commutative ring with unity.

Let $S \subset R$ be a subset.

Let $R \sqbrk X$ be the polynomial ring in one variable over $R$.

Let $R^S$ be the ring of mappings from $S$ to $R$.

Let $\iota \in R^S$ denote the inclusion $S \hookrightarrow R$.

A **polynomial function** on $S$ is a mapping $f : S \to R$ which is in the image of the evaluation homomorphism $R \sqbrk X \to R^S$ at $\iota$.

## Also known as

A **polynomial function** is often simply called **polynomial**.

Some sources refer to it as a **rational integral function**.

## Also see

## Sources

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