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Problem DescriptionIf two people were born one after another with one second difference and one of them is a child, then the other one is a child too. We get by induction that all the people are children.Everyone knows that the mathematical department of the Ural State University is a big family of 阅读全文
posted @ 2014-03-27 16:57
chen2013
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Problem DescriptionThe president of the Ural State University is going to make an 80'th Anniversary party. The university has a hierarchical structure... 阅读全文
posted @ 2014-03-27 12:09
chen2013
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