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bio website duodaa.com
location China
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seen Aug 24 '13 at 13:31

"If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is complicate." – John von Neumann

如果一个人不相信数学是简单的,那仅仅只是因为他没有意识到复杂的生活是有多难。 -冯·诺伊曼