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Dec 23, 2010 at 20:42 comment added khaled ahmad thank u for this answer, it was very helpfull to me and i think that is quite correct put you dont give the complete of question about what if it is paracompact thank you again khaled ahmad
Dec 23, 2010 at 20:40 vote accept khaled ahmad
Dec 12, 2010 at 19:50 comment added Qiaochu Yuan Are these two-sided primes? How does the deduction that sum I_a = R work in an arbitrary ring?
Dec 12, 2010 at 18:48 history answered Simon Rose CC BY-SA 2.5