设(X,d)为紧致度量空间,f∶X→X连续,(k(X),dH)是X所有非空紧致子集构成的紧致度量空间,f∶k(X)→k(X),f(A)={f(a)|a∈A}。运用分析的方法初步给出了集值离散动力系统中的扩张性理论。提出集值映射的全扩张、强全扩张的概念,并研究了f的扩张性与f的扩张性之间的关系。所得结果扩展了集值离散动力系统的研究范围,并提出了该领域未来可研究的方向。
Let ( X,d) be a compact metric space,∶ X→X a continuous map,and ( k( X) ,dH) a compact metric space consisting of all non-empty compact subsets of X,∶ k( X) →k( X) ,( A) ={ f( a) | a∈A} . Using the method of analysis,this paper gave the theory of expansiveness for set-valued discrete dynamical systems,presented the concepts of totally expansive and strong totally expansive,studied the relations between the expansiveness of and the expansiveness of . These results further extend the scope of the research on set-valued discrete dynamical systems,and propose future study aspect in this field.