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杨正瓴
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约克后来收到了沙可夫斯基寄来的论文，发表在《乌克兰数学杂志》1964年第16期上，那是一个美国数学家从不问津的一份刊物。比起李-约克文章发表的1975年，已经整整11年过去了。
沙可夫斯基 (Oleksandr Mykolayovych Sharkovsky, 1936-)
https://en.wikipedia.org/wiki/Oleksandr_Mykolayovych_Sharkovsky
is a prominent Ukrainian mathematician most famous for developing Sharkovsky's theorem on the periods of discrete dynamical systems in 1964.
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《乌克兰数学杂志》，就是一个省级期刊啊！！
2018-10-12 09:55
沙可夫斯基 (Oleksandr Mykolayovych Sharkovsky, 1936-)
https://en.wikipedia.org/wiki/Oleksandr_Mykolayovych_Sharkovsky
is a prominent Ukrainian mathematician most famous for developing Sharkovsky's theorem on the periods of discrete dynamical systems in 1964.
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《乌克兰数学杂志》，就是一个省级期刊啊！！
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