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Nov 13, 2015 at 14:56 comment added user173856 Hello, llya Bogdanov. Thank you very much for your help. Your proof is so ingenious. I have never seen this kind of method before. Would you please tell me how you got the idea of the proof above? By the way, do you know any result relative to my question?
Nov 13, 2015 at 2:48 vote accept user173856
Nov 13, 2015 at 2:48 comment added user173856 llya Bogdanov:It is a very nice proof! Thank you very much!
Nov 12, 2015 at 15:30 history answered Ilya Bogdanov CC BY-SA 3.0