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Does every subset of a linear ordered set has a least element? If yes, then there's no difference between Linear ordered set and well ordered set. If no, how to prove it?(or can you give me a example? I know the answer should be 'no', but my intuition tells me 'yes').TUOYUTSENG (talk) 08:27, 27 November 2011 (UTC)
Thank you!TUOYUTSENG (talk) 10:23, 27 November 2011 (UTC)