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Apr 12, 2018 at 9:08 comment added Jack Thanks a lot for your answer. I can see it’s also a great idea.Though I tired hard to understand your proof, given the fact that my major is not mathematics, I can’t figure it out. I really appreciate your brilliant idea you put here.
Apr 11, 2018 at 14:14 vote accept Jack
Apr 11, 2018 at 14:15
Mar 10, 2018 at 19:41 history answered Lutz Mattner CC BY-SA 3.0