迭代函数系统的强跟踪性质

给出了迭代函数系统(IFS(F))的强跟踪性质的概念并且研究了它的相关性质.结合经典动力系统的相关方法,首先证明了一致压缩的迭代函数系统都有强跟踪性质,从而给出了具有强跟踪性质的相关例子;另外也证明了两个IFS(F)的强跟踪性质在拓扑共轭的条件下是保持不变的;最后我们得到了:如果IFS(F)有小距离扩张性,则它是开的当且仅当它具有强跟踪性质.     

一类圆周自映射的伪轨跟踪性质

本研究圈周上的连续自映射，我们得到一类非满映射具有伪轨跟踪性质的充分必要条件。     

半流的原像熵

本文对紧致度量空间上的连续半流引入了几类原像熵的定义,并对它们的性质进行了研究,证明了对于无不动点的连续半流而言,这些熵具有一定程度的拓扑共轭不变性,对这些熵的关系进行了研究并得到了联系这些熵的不等式,还证明了连续半流与其时刻1映射具有相同的拓扑熵和原像熵。     

一类单调斜积半流的ω-极限集的提升动力学行为

本文研究了一类具有极小基流的单调斜积半流.在假定半流存在-个半连续的半平衡的前提下,我们证明了具有某种一致稳定性的正半轨线的ω极限集具有1-covering性质,这为理解系统的全局动力学提供了几何洞察.     

半广义不定映射

在L-拓扑空间中引入半广义不定映射,强半广义连续映射,全半广义连续映射,同时讨论它们一些性质。     

提升和投射具有伪轨跟踪性质或可扩性的连续流

本文证明了紧度量空间上的连续流经提升或投射后，其伪轨跟踪性质及可扩性是不变的；做为应用给出了不定向闭曲面上具有伪轨跟踪性质的Ｃｒ流的特征。     

一种守恒型间断跟踪法在一维单守恒律方程非凸流上的实现

本文的第二作者在近几年发展了一种守恒型的间断跟踪法，该跟踪法是以解的守恒性质作为跟踪的机制，而不是象传统的跟踪法利用Rankine-Hugoniot条件来进行跟踪．本文中主要研究将该算法推广至单个守恒律非凸流的情况．利用精确求解Riemann问题，我们很好地处理了非凸流Riemann解的激波和稀疏波的并存结构，既实现了对激波的跟踪，又成功地分辨出稀疏波．第四节的数值例子。显示了满意的数值结果．     

测度中心的Mα-跟踪性质

本文证明如果动力系统具有周期M_α-跟踪性质或者周期M_α-跟踪性质,则其测度中心的限制系统也具有相同的跟踪性质.反之,如果动力系统在其测度中心的限制系统具有周期M_α-跟踪性质(或者,周期M_α-跟踪性质),则该动力系统具有周期M_β-跟踪性质(相应地,周期M_β-跟踪性质),对任意β∈[0,α).同时得到对等度连续系统,众多跟踪性质都等价于动力系统具有平凡的测度中心.     

半线性抛物型方程定义的光滑强单调流收敛于半渐近稳定的奇点

本文研究半线性抛物型方程定义的光滑强单调流的渐近性态，我们给出了具有有界轨线且不收敛于半渐近稳定奇点的点集在Ｘ￣α中是第一范畴的充要条件，我们还研究了全有序奇点弧的存在性和非平凡不变函数的存在性之间的等价关系。     

强拟闭集与强拟连续

利用半闭集引入强拟闭集概念,研究了半开集、强拟开集、强拟闭集概念之间的关系,得到了强拟闭集是连续闭映射下的不变量及其相关性质;最后给出强拟连续概念并得到其等价刻画.     

On shadowing: Ordinary and ergodic

The aim of this paper is to introduce the notion of ergodic shadowing for a continuous onto map which is equivalent to the map being topologically mixing and has the ordinary shadowing property. In particular, we deduce the chaotic behavior of a map with ergodic shadowing property. Moreover, we define some kind of specification property and investigate its relation to the ergodic shadowing property.     

Inverse shadowing and related measures In Memory of Professor Shantao Liao

We study various weaker forms of the inverse shadowing property for discrete dynamical systems on a smooth compact manifold. First, we introduce the so-called ergodic inverse shadowing property(Birkhoff averages of continuous functions along an exact trajectory and the approximating one are close). We demonstrate that this property implies the continuity of the set of invariant measures in the Hausdorff metric. We show that the class of systems with ergodic inverse shadowing is quite broad; it includes all diffeomorphisms with hyperbolic nonwandering sets. Second, we study the so-called individual inverse shadowing(any exact trajectory can be traced by approximate ones, but this shadowing is not uniform with respect to the initial point of the trajectory).We demonstrate that this property is closely related to structural stability and ?-stability of diffeomorphisms.     

Shadowing and Inverse Shadowing for C^1 Endomorphisms

In this paper, we consider the shadowing and the inverse shadowing properties for C^1 endomorphisms. We show that near a hyperbolic set a C^1 endomorphism has the shadowing property, and a hyperbolic endomorphism has the inverse shadowing property with respect to a class of continuous methods. Moreover, each of these shadowing properties is also ＂uniform＂ with respect to C^1 perturbation.     

Interiors of sets of vector fields with shadowing corresponding to certain classes of reparameterizations

The structure of the C ¹-interiors of sets of vector fields with various forms of the shadowing property is studied. The fundamental difference between the problem under consideration and its counterpart for discrete dynamical systems generated by diffeomorphisms is the reparameterization of shadowing orbits. Depending on the type of reparameterization, Lipschitz and oriented shadowing properties are distinguished. As is known, structurally stable vector fields have the Lipschitz shadowing property. Let X be a vector field, and let p and q be its points of rest or closed orbits. Suppose that the stable manifold of p and the unstable manifold of q have a nontransversal intersection point. It is shown that, in this case, the vector field X does not have the Lipschitz shadowing property. If one of the orbits p and q is closed, then X does not have the oriented shadowing property. These assertions imply that the C ¹-interior of the set of vector fields with the Lipschitz shadowing property coincides with the set of structurally stable vector fields. If the dimension of the manifold under consideration is at most 3, then a similar result is valid for the oriented shadowing property. We study the structure of the C ¹-interiors of sets of vector fields with various forms of the shadowing property. It is shown that, in the case of the Lipschitz shadowing property, it coincides with the set of structurally stable systems. For manifolds of dimension at most 3, a similar result is valid for the oriented shadowing property.     

强链回归集与强跟踪性

为了研究强跟踪性，本文给出了强链回归集的定义．证明了：若度量空间上的一个连续自映射有强跟踪性，则其强链回归集与极限集相同．     

A note on the average shadowing property for expansive maps

Let f be a continuous map of a compact metric space. Assuming shadowing for f we relate the average shadowing property of f to transitivity and its variants. Our results extend and complete the work of Sakai [K. Sakai, Various shadowing properties for positively expansive maps, Topology Appl. 131 (2003) 15-31].     

两类具有极限跟踪性的双曲系统

本文讨论了紧度量空间上连续满射及同胚的一类特殊的跟踪性—极限跟踪性的几个基本性质,并证明了R~n上双曲自同构及环面T~n上双曲自同态(n≥1)具有极限跟踪性。     

Dynamical systems with Lipschitz inverse shadowing properties

In this paper, the notion of the Lipschitz inverse shadowing property with respect to two classes of d-methods that generate pseudotrajectories of dynamical systems is introduced. It is shown that if a diffeomorphism of a Euclidean space has the Lipschitz inverse shadowing property on the trajectory of an individual point, then the Mañé analytic strong transversality condition must be satisfied at this point. This result is used in the proof of the main theorem: a diffeomorphism of a smooth closed manifold that has the Lipschitz inverse shadowing property is structurally stable.     

A unified approach to theories of shadowing

This paper introduces the notion of a general approximation property, which encompasses many existing types of shadowing. It is proven that there exists a metric space X such that the sets of maps with many types of general approximation properties (including the classic shadowing, the L _p -shadowing, limit shadowing, and the s-limit shadowing) are not dense in C(X), S(X), and H(X) (the space of continuous self-maps of X, continuous surjections of X onto itself, and self-homeomorphisms of X) and that there exists a manifold M such that the sets of maps with general approximation properties of nonlocal type (including the average shadowing property and the asymptotic average shadowing property) are not dense in C(M), S(M), and H(M). Furthermore, it is proven that the sets of maps with a wide range of general approximation properties (including the classic shadowing, the L _p -shadowing, and the s-limit shadowing) are dense in the space of continuous self-maps of the Cantor set. A condition is given that guarantees transfer of general approximation property from a map on X to the map induced by it on the hyperspace of X. It is also proven that the transfer in the opposite direction always takes place.     

$\mathbb{Z}^{k}$-作用一维子系统的Lipschitz跟踪性

本文主要研究了$\mathbb{Z}^{k}$-作用一维子系统的跟踪性质. 文中运用两种等价的方式引入了$\mathbb{Z}^{k}$-作用一维子系统的伪轨以及跟踪性的概念. 对于一个闭黎曼流形上的光滑$\mathbb{Z}^{k}$-作用$T$, 我们通过诱导的非自治动力系统提出了Anosov方向的概念. 借助Bowen几何的方法, 我们证明了$T$沿着任意Anosov方向具有Lipschitz跟踪性.