Lemma 10.120.8. A UFD satisfies the ascending chain condition for principal ideals.
Proof. Consider an ascending chain (a_1) \subset (a_2) \subset (a_3) \subset \ldots of principal ideals in R. Write a_1 = p_1^{e_1} \ldots p_ r^{e_ r} with p_ i prime. Then we see that a_ n is an associate of p_1^{c_1} \ldots p_ r^{c_ r} for some 0 \leq c_ i \leq e_ i. Since there are only finitely many possibilities we conclude. \square
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