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出 处:《纯粹数学与应用数学》2013年第2期179-184,共6页Pure and Applied Mathematics
基 金:陕西省自然科学基金(2012JM1016)
摘 要:设(X,d1,f1,∞)与(Y,d2,g1,∞)为两个非自治动力系统,h是从(X,d1,f1,∞)到(Y,d2,g1,∞)的拓扑半共轭.通过对自治动力系统中的h-极小覆盖的研究,本文得到了以下结论:1)对于任意的y∈Y及x∈h 1(y),orb(x,f1,∞)被h映射为orb(y,g1,∞),ω(x,f1,∞)被h映射为ω(y,g1,∞);2)在(X,d1,f1,∞)中引入关于拓扑半共轭的h-极小覆盖的定义,证明了h-极小覆盖的存在性;3)对于任意的x∈X和y∈Y,在(ω(x,f1,∞),f1,∞|ω(x,f1,∞))与(ω(y,g1,∞),g1,∞|ω(y,g1,∞))均构成原系统的子系统的前提下,R(f1,∞)被h映射为R(g1,∞).这些结论丰富了非自治动力系统的内容.Let (X, dl, fl∞) and (Y, d2, g1∞) are non-autonomous discrete dynamical systems, (Y, d2, gl∞) is quasiconjugate to (X, dl,fl∞) via h : X -+ Y. By using the h-minimal covering of autonomous discrete dynamical systems, we can obtain the following resluts : 1) For any point y C Y, x E h-l(y), there are h(orb(x, fl∞)) = orb(y, gl∞) and h(w(x, fl∞)) = w(y, gl∞); 2) We define the h-minimal covering of non- autonomous discrete dynamical systems (X, dl, fl∞). In addition, the existence of the h-minimal covering is studied; 3) For any point x E X, y @ Y, while (w(x, fl∞), fl,ool(x,ii)) and (w(y, gl∞), gl∞l(u,gl∞)) are subsystems of the original systems, we have h(R(fl∞)) = R(gl∞). These conclusions enriched the contents of non-autonomous discrete dynamical systems.
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