# Math Help - flat algebra

1. ## flat algebra

Let $A[x]$ be the ring of polynomials in one indeterminate over a ring $A$. Prove that $A[x]$ is a flat $A$-algebra.

2. What does it mean flat algebra? There is no such term when I searched for it on the internet.

3. The book doesn't even define it, but expects you to solve a problem with the term in it.

This is from an Introduction to Commutative Algebra by Atiyah

4. Originally Posted by heathrowjohnny
The book doesn't even define it, but expects you to solve a problem with the term in it.

This is from an Introduction to Commutative Algebra by Atiyah
I guess it's asking you to prove that A[x] is a flat A-module.