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Nov 23, 2010 at 17:25 answer added Pengfei timeline score: 1
Jul 5, 2010 at 6:26 vote accept X.M. Du
Jul 2, 2010 at 9:47 comment added X.M. Du @Climenhaga: Sorry, English is not my native language. I may have some mistakes when expressing the meaning. What you said is exactly that I want to ask. Thanks for correcting my mistake. @Su\'arez-alvarez: I mean "for all positive integral numbers".
Jul 1, 2010 at 17:50 comment added Mariano Suárez-Álvarez In your second paragraph, do you mean "for all positive integral numbers $n$" or "for some positive integral number $n$"?
Jul 1, 2010 at 17:47 answer added rpotrie timeline score: 10
Jul 1, 2010 at 13:28 comment added Vaughn Climenhaga I think you mean to ask, "Must we have..." -- of course we "can" have the situation you describe.
Jul 1, 2010 at 13:07 history asked X.M. Du CC BY-SA 2.5