I got problem which is the same here but I can not solve follow the way 2 of them pointing out Show $R \setminus S$ is a union of prime ideals Please help me explain more. And one more thing I wanna ask that the converse is still right. Could you give the solution of the converse?
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Do you mean you cannot follow the two answers, and want a more detailed working-out? – Arthur Jul 12 '16 at 06:31
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I mean I got the stuck which is exactly the same in the last sentence of this post. I see the hints but I still can not prove it. – Thế Long Lê Jul 12 '16 at 06:33
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Then when you say, in your question, that "I can solve", that was a typo? I'll write something down, just give me a few minutes. – Arthur Jul 12 '16 at 06:35
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I see@@. That was my mistake. Thank you – Thế Long Lê Jul 12 '16 at 06:53