周期mild解和算子半群的谱(英)

设Ｘ是Ｈｉｌｂｅｒｔ空间,ｅ~Ａｔ是Ｘ上的（１,Ａ）类半群．本文给出了用（λ－Ａ）~－１的性质来描述ｅ~Ａｔ谱的特征,同时也得到了Ｂａｎａｃｈ空间Ｘ中使（１,Ａ）类半群谱映射定理成立的一些充分条件．     

关于Brandt半群共轭包的结构

在本文中，我们给出了Ｂｒａｎｄｔ半群Ｓ的共轭包Ψ（Ｓ）的刻划，同时也给出Ψ（Ｓ）的全逆子半群Ｔ（Ｓ）的刻划，利用这些结果，我们证明Ｔ（Ｓ）在Ψ（Ｓ）中是自共轭的．     

Poisson半群的边界值

在空间Ｌｐ（Ｒｎ），１≤ｐ＜∞中，Ｐｏｉｓｏｎ算子半群ｅ－－△ｚ是右半平面Ｒｅｚ＞０上的解析半群．本文考虑它的边界值，证明了闭稠定算子－ｉ－△对某个α≥０生成了一个指数有界（Ｉ＋－△）－α 半群．     

关于一致凸Banach空间中渐近非扩张半群的几乎轨道的渐近行为

设Ｘ是具有Ｆｒｃｈｅｔ可微范数的一致凸Ｂａｎａｃｈ空间，Ｃ是Ｘ的有界闭凸子集，Ｓ＝｛Ｔ（ｔ）：ｔ≥０｝是Ｃ上渐近非扩张牛群．若ｕ（·）：［０，＋∞）→Ｃ是Ｓ的几乎轨道且关于ｔ∈［０，＋∞）一致连续，则｛ｕ（ｔ）｝几乎弱收敛到集合　　｛ｕ（ｒ）：ｒ≥ｔ｝∩Ｆ（ｓ）的唯一点。     

关于Brandt半群工轭包的结构

在本文中，我们给出了Ｂｒａｎｄｔ半群Ｓ的共轭包Ψ（Ｓ）的刻划，同时也给出Ψ（Ｓ）的全逆子半群Ｔ（Ｓ）的刻划，利用这些结果，我们证明Ｔ（Ｓ）在Ψ（Ｓ）中是自共轭的。     

Г—纯整半群

印度数学家Ｍ．Ｋ． Ｓｅｎ和Ｍ．Ｋ．Ｓａｈａ在１９８６年给出了Г－半群的概念和讨论了Г－半群的若干性质。本文引入了Г－正则半群和Г－纯整半群的概念。     

局部可积半群的谱映射定理

设（Ｔ（ｔ）ｔ〉０为Ｂａｎａｃｈ空间Ｘ上的局部可积半群，我们讨论（Ｔ（ｔ）ｔ〉０与它的多值生成元Ａ之间的谱关系。     

关于Clifford半群S和Brandt半群S的S的构造(英文)

设Ｓ是半群,Ｓ是Ｓ上所有一一偏的右平移构成的逆半群．在本文中证明了,对Ｃｌｉｆｏｒｄ半群Ｓ＝［Ｙ;Ｇα,φα,β］,Ｓｉｍｌｉｍ｛Ｇα｝α∈Ｙ,而对Ｂｒａｎｄｔ半群Ｓ＝Ｂ（Ｇ,Ｉ）,ＳＧｗｒＪ（Ｉ）．     

弱交换富足序半群(Ⅰ)

本文将序半群上的 Ｇｒｅｅｎ’ｓ－关系推广为 Ｇｒｅｅｎ’ｓ＊一关系．给出主序（左、右）＊－理想、主序＊－滤特征描述和弱交换富足序半群的特征．用这些特征证明了一类弱交换富足序半群的结构定理：若序半群Ｓ满足 ,则Ｓ是弱交换富足序半群当且仅当Ｓ是左（右）单序半群｛（ｅ）（Ｓ）｝的半格．     

T(t)积分半群

本文引入Ｔ（ｔ）积分半群的概念，它是ｎ次积分半群［１］及α次积分半群［２］的推广．我们给出Ｔ（ｔ）积分半群的定义、生成定理，并讨论相应的一类积分型抽象Ｃａｕｃｈｙ问题解的存在唯一性．     

Maximum Principle of Semi-Linear Distributed System (I)

In this paper, an optimal control problem of non-linear Volterra systems $x(\cdot)=h(t)+\int_0^t G(t,s)f(s,x(s),u(s))ds$ on Banach space X with a general cost functional $Q(u(\cdot)) = \int_0^T J(s,x(s,u(\cdot)),u(s))ds$ is discussed, where $G(t,s)\in \varphi(X)$ is strongly continuous in (t, s), h(\cdot)\in C([0,T],G),f(s,x,u):[0,T]*X*U \rightarrow X and J (s, x, u) : [0, T] *X*U \rightarrow R. The control region U is an arbitrary set in a Banach space. Under some other assumptions of f and J, we have proved the following Theorem. The optimal control u^*(\cdot) of the above problem satisfies max $H(t,u)=H(t,u^*(t))$ for a.e.t\in [0,T], Where $H(t,u)=-J(t,x^*(t),u)+(\phi(t),f(t,x^*(t),u))$, $\phi(t)=\int_t^T J_x(s,x^*(s),u^*(s))U(s,t)ds$ and $x^*(t)=x(t,u^*(\cdot)),U(s,t)\in \phi(X)$ is the solution of $U(s,t)=G(s,t)+\int _t^s G(s,w)f_x(w,x^*(w),u^*(w))U(w,t)dw$. We have applied the results to semi-linear distributed systems.     

关于Banach空间中渐近非扩张型半群的不动点的存在性

设C是具有弱一致正规结构的Banach空间X的非空弱紧凸子集, T={T(t):t∈S}是渐近非扩张型半群, 且每个T(t)在C上连续. 该文证明了如下结论:(i) 若X是一致凸的, 则F(T) 非空;(ii) 若T={T(t):t∈S}满足lim inf_{t→∞,t in S}|‖T(t)‖|<+∞, 且在C上弱渐近正则, 则F(T)非空, 其中|‖T(t)‖|是T(t)的精确的Lipsch itz常数,F(T)是T(t),t∈S的所有公共不动点之集.     

Topology and topological sequence entropy

Let X be a compact metric space and T:X-→X be continuous.Let h*(T)be the supremum of topological sequence entropies of T over all the subsequences of Z+and S(X)be the set of the values h*(T)for all the continuous maps T on X.It is known that{0}■S(X)■{0,log 2,log 3,...}∪{∞}.Only three possibilities for S(X)have been observed so far,namely S(X)={0},S(X)={0,log 2,∞}and S(X)={0,log 2,log 3,...}∪{∞}.In this paper we completely solve the problem of finding all possibilities for S(X)by showing that in fact for every set{0}?A?{0,log 2,log 3,...}∪{∞}there exists a one-dimensional continuum XAwith S(XA)=A.In the construction of XAwe use Cook continua.This is apparently the first application of these very rigid continua in dynamics.We further show that the same result is true if one considers only homeomorphisms rather than continuous maps.The problem for group actions is also addressed.For some class of group actions(by homeomorphisms)we provide an analogous result,but in full generality this problem remains open.     

具有Q-正则*-断面的正则半群上的*-同余格

文中给出了一个具有正则*-断面正则半群的例子,该半群同时存在非平凡*-同余和非平凡的非*-同余;证明了正则*-断面上的每个*-同余都能扩张成整个半群上的*-同余;刻划了*-同余和*-同余格;定义了*-同余格上的两个完全同余T*FS和T*S*;研究了*-同余格上的完全同余T*S*, T*, T*l, Tr, U*和V*, 给出了这些同余的类中的极值同余(除U*, V*外).     

On the quasidiagonality of Roe algebras

Let X be a noncompact discrete metric space with bounded geometry. Associated with X are two C*-algebras, the so-called uniform Roe algebra B*(X) and coarse Roe algebra C*(X), which arose from the index theory on noncompact complete Riemannian manifolds. In this paper, we describe the quasidiagonality of B*(X) and C*(X) in terms of coarse geometric invariants. Some necessary and suficient conditions are given, which involve the Fredholm index and coarse connectedness of metric spaces.     

Integrably asymptotic affine homeomorphisms of the circle and Teichmüller spaces

A quasisymmetric homeomorphism of the unit circle S1 is called integrably asymptotic affine if it admits a quasiconformal extension into the unit disk so that its complex dilatation is square integrable in the Poincar metric on the unit disk. Let QS*(S1) be the space of such maps. Here we give some characterizations and properties of maps in QS(S1). We also show that QS*(S1)/M(O)b(S1) is the completion of Diff(S1)/M(O)b(S1) in the Weil-Petersson metric.     

Zur Stetigkeit der mengenwertigen metrischen Projektion in endlichdimensionalen Räumen

Let X be a real normed linear space, X^* its dual, V a linear subspace of X and S(V) the unit sphere in the orthogonal space In this note we prove in the case of finite-dimensional X the following sufficient condition for the continuity of the set-valued metric projection in terms of the mapping and : If the restriction of T to S(V) is lower semi-continuous then P_V is lower semi-continuous.     

全纯二次微分的一些注记

记Q(X)为双曲黎曼曲面X上所有具有有限L^1-模的全纯二次微分所组成的Banach空间．本文讨论由V(φ)=|φ|/φ所定义的映射V：Q(x)→Q*(X)及其逆映射V^-1的连续性，并得到一些关于Teichmiiller空间几何的Lakic-型结果.