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Jan 8, 2010 at 5:43 comment added Alfonso Gracia-Saz Thanks. I should learn to look up wikipedia before asking.
Jan 8, 2010 at 5:40 vote accept Alfonso Gracia-Saz
Jan 8, 2010 at 5:40 vote accept Alfonso Gracia-Saz
Jan 8, 2010 at 5:40
Jan 8, 2010 at 5:26 comment added Qiaochu Yuan More generally, GCD domains are integrally closed. (Note that the real problem here is not about two elements, but one: the lattice of divisors of 4 does not have suprema.)
Jan 8, 2010 at 5:23 history answered Charles Siegel CC BY-SA 2.5