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- ...uct of irreducible elements, and a ring is a [[Unique factorization domain|UFD]] if this factorization is unique (up to order and multiplication by units) ...ys be factored, they do not generally form a [[Unique factorization domain|UFD]]. For example, if <math>K=\mathbb{Q}[\sqrt{-5}]</math>, we have10 KB (1,646 words) - 14:04, 28 May 2020