In 1975,T.Y.Li and J.A.Yorke have proven a special situation of the Sarkovskii theorem,and at first time put forward the concept of chaos.The paper of Li-Yorke has caused the widespread discussion of semi-dynamic system in the line segment.The Li-Yorke th
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孙利霞,张雅清. Li-Yorke定理新证[J].重庆工商大学学报(自然科学版),2006,(4): SUN Li-xia, ZHANG Ya-qing. A new proof of Li-Yorke Theorem[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2006,(4):