[Math] $\mathbb{Z}[X]$ is noetherian

abstract-algebracommutative-algebra

This follows from Hilbert's basis theorem, which is valid for polynomial rings over any noetherian ring. But is there a more elementary proof, knowing that $\mathbb{Z}$ is a PID (even a Euclidean domain)?

Best Answer

Using the information you have about the ideals of $\mathbb Z$ and of polynomial rings in one variable over fields (both of which are PIDs), you can —with some work— describe all ideals of the ring, and then check the ACC by hand.