Definition:Constant Term of Polynomial

Definition
Let $R$ be a commutative ring with unity.

Let $P \in R \sqbrk X$ be a nonzero polynomial over $R$:


 * $\ds f = \sum_{k \mathop = 0}^n a_k \circ x^k$

where $n$ is the degree of $P$.

The constant term of $P$ is the coefficient $a_0$ of $x^0$.