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British astronomer Eddington liked to ride a bike. It is said that in order to show off his skill, he has even defined an "Eddington number", E -- tha 阅读全文
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About 900 years ago, a Chinese philosopher Sima Guang wrote a history book in which he talked about people's talent and virtue. According to his theor 阅读全文
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Eva loves to collect coins from all over the universe, including some other planets like Mars. One day she visited a universal shopping mall which cou 阅读全文
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转自:https://www.cnblogs.com/terencezhou/p/6235974.html https://www.cnblogs.com/nsnow/p/4758202.html 这个讲到了协方差矩阵的几何解释，，我现在是看不懂的。。。 2020-9-14更新—————— http 阅读全文