# Definition:Degree of Polynomial/Integral Domain

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## Definition

Let $\struct {R, +, \circ}$ be a commutative ring with unity whose zero is $0_R$.

Let $\struct {D, +, \circ}$ be an integral subdomain of $R$.

Let $X \in R$ be transcendental over $D$.

Let $\ds f = \sum_{j \mathop = 0}^n \paren {r_j \circ X^j} = r_0 + r_1 X + \cdots + r_n X^n$ be a polynomial over $D$ in $X$ such that $r_n \ne 0$.

Then the **degree of $f$** is $n$.

The **degree of $f$** is denoted on $\mathsf{Pr} \infty \mathsf{fWiki}$ by $\map \deg f$.

## Also known as

The **degree** of a polynomial is also referred to by some sources as its **order**.

Some sources denote the **degree** of a polynomial by $\partial f$

## Sources

- 1978: Thomas A. Whitelaw:
*An Introduction to Abstract Algebra*... (previous) ... (next): $\S 64$. Polynomial rings over an integral domain