For a dynamic system, if there is a (quasi) weakly almost periodic point but not an almost periodic point, then there exists a subsystem which is chaotic in the sense of revised Devaney.
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- 摘要得到一个动力系统如果存在非几乎周期的(拟)弱几乎周期点,则存在子系统在修改的狄万内意义下是混沌的。