Infinite-dimensional linear dynamical systems with chaoticity

The authors present two results on infinite-dimensional linear dynamical sy stems with chaoticity. One is about the chaoticity of the backward shift ma p in the space of infinite sequences on a general Frechet space. The other is about the chaoticity of a translation map in the space of real continuou s functions. The chaos is shown in the senses of both Li-Yorke and Wiggins. Treating dimensions as freedoms, the two results imply that in the case of an infinite number of freedoms, a system may exhibit complexity even when the action is linear. Finally, the authors discuss physical applications of infinite-dimensional linear chaotic dynamical systems.