Gauss's Lemma on Unique Factorization Domains

Theorem

Let $R$ be a unique factorization domain.

Then the ring of polynomials $R \sqbrk X$ is also a unique factorization domain.

Proof

Since a UFD is Noetherian, and a Noetherian Domain is UFD if every irreducible element is prime, it is sufficient to prove that every irreducible element of $R \sqbrk X$ is prime.

etc,

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Source of Name

This entry was named for Carl Friedrich Gauss.