# Let $R$ be an integral domain and $I$ be a prime ideal of $R$. If $R/I$ is a Euclidean domain, will $R$ be a unique factorization domain?

Let $R$ be an integral domain and $I$ be a prime ideal of $R$. If $R/I$ is a Euclidean domain, will $R$ be a unique factorization domain?

I have no idea to prove or disprove this... should I prove or disprove?

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My immediate reaction to questions worded like this is to say that it depends on $R$ and $I$. I can think of more than one way to interpret the question, and you might find it helpful to phrase it more formally. – Derek Holt Dec 28 '13 at 9:14
To be more specific, are you assuming that $R/I$ is a Euclidean domain for all prime ideals $I$ of $R$, or that there exists an ideal $I$ of $R$ such that $R/I$ is a Euclidean Domain? – Derek Holt Dec 28 '13 at 14:03
Do you know any nonunique factorization domains? – Bill Dubuque Dec 28 '13 at 17:36

@RenShiquan Here's a (hopefully not overkill) complementary hint to this one. Sometimes it's good to consider extremes. Let $R$ be as bad as possible, but make sure that $R/I$ is as good as possible. This is the direction of anon's hint – rschwieb Dec 28 '13 at 12:07