关于Teichmüller映射初始二次微分的计算机算法

利用Marden和Strebel关于高度映射的结果,伍胜健设计了Teichmüller映射初始二次微分的迭代算法,由此给出了关于Teichmüller映射初始二次微分计算的理论结果,利用该结果并结合Gortler,Thurston和Palmer关于离散二次微分的研究,本文设计了初始二次微分的计算机算法.     

单位圆内极值拟共形映射的Hamilton序列 *

通过研究Strebel引进的关于二次微分的高度所决定的映射 ,建立了单位圆上拟对称函数的最大模序列和极值拟共形映射的Hamilton序列的联系 ,从而证明了一个Hamilton序列只被一个拟对称函数所决定 .     

函数的次微分连续性与邻近正则性

研究了函数和集在某点的邻近正则性与次微分连续性,给出邻近正则函数的次微分在某种意义下的单调性及函数的邻近正则性与其上图的邻近正则性的关系．     

基于Hamilton体系和辛算法的微分对策数值法

微分对策求解往往涉及到困难的两点边值问题（TPBV）,将线性二次型微分对策问题归结于Hamilton体系．对Hamilton系统,辛几何算法具有能复制Hamilton系统的动态结构并保持相平面上的测度的优点．从Hamilton系统角度,探讨了线性二次型微分对策系统的辛性质;作为尝试,对无限期间线性二次型微分对策的计算引入Symplectic-Runge-Kutta算法．给出了一个数值计算实例,从结果可以说明这种方法的可行,也体现了辛算法对系统的能量具有良好的守恒性．     

Banach空间扰动集值映射最优化的锥次微分稳定性

本文研究Ｂａｎａｃｈ空间中扰动集值映射最优化的稳定性问题,在目标映射和约束映射均为半连续和锥凸的条件下,得到了扰动问题的锥有效点集和锥弱有效点集分别在锥次秃分和锥弱次微分意义下的稳定性结果。     

集值映射的次微分的性质及其应用(英文)

本文讨论了文章Subgradient of S-convex set-valued mappings and weak efficientsolutions(Appl.Math.J.Chinese Univ.1998,13(4):463-472)中引入的集值映射的次微分的性质及应用.利用相依导数的性质,讨论次微分的性质,并得到了两个集值映射的和、复合以及交的次微分的运算法则.最后,通过这种次微分得到了集值优化问题最优性条件的充要条件,同时推广了此文中的定理7.     

一类计量二次抽样方案ASN的极值

In double sampling plan,the average sample number(called ASN for short)is a very important basis of selecting the plan.For the situation of toality obeyed Weibull distribution,this paper gives the ASN‘s extreme value for measuring double sampling plan,which is helpful to understand the ASN‘s characteristics of double sampling plan in Weibull distribution.     

集值映射的Hα-次微分及其存在性

借助有限维向量空间中的α较多锥,西文对集值映射引进了一种新的Hα-共轭映射和Hα-次微分的概念。研究了Hα-共轭映射和Hα-次微分的有关性质,特别地证明了Hα-次微分的存在定理。与其它关于尖闭凸锥上的次微分理论的不同之处在于,本理论建立在非闭非凸的α-较多锥上,不是前者的直接推广。Hα-次微分是研究α-较多有效解的共轭对偶性和次微分稳定性的重要工具。     

指数函数的二次 Padé逼近的唯一性 ,微分恒等式与渐近式(英文)

本文给出了指数函数的二次 Padé逼近的唯一性 ,微分恒等式与渐近式 ,并改正了文 [3 ]中的一个错误 .     

Some Properties of an Operator on L^∞（△） and Its Applications

In this paper, we introduce an operator Hμ（z） on L^∞（△） and obtain some of its properties. Some applications of this operator to the extremal problem of quasiconformal mappings are given. In particular, a sufficient condition for a point r in the universal Teichmfiller space T（△） to be a Strebel point is obtained.     

A note on Hamilton sequences for extremal Beltrami coefficients

F. P. Gardiner gave a sufficient condition for a sequence to be a Hamilton sequence for an extremal Beltrami coefficient. In this note, we shall consider the converse problem, proving that the condition is not necessary.

     

A note on the density of a subset of all integrable holomorphic quadratic differentials

Let T0(Δ) be the subset of the universal Teichm¨uller space, which consists all of the elements with boundary dilatation 1. Let SQ(Δ) be the unit ball of the space Q(Δ) of all integrable holomorphic quadratic differentials on the unit disk Δ and Q0(Δ) be defined as Q0(Δ) = {? ∈ SQ(Δ) : there exists a k ∈(0, 1) such that [kˉ? |?|] ∈ T0(Δ)}. In this paper, we show that Q0(Δ) is dense in SQ(Δ).     

关于二次函数的约束优化的算法研究

在本篇论文中,我们尝试用共轭方向法来处理二次函数的约束优化问题．我们 首先讨论了一下正定时的情况,再讨论负定时的情况．对于正定二次函数的优化问题,我 们提出一个算法,可以构造一列收敛到最优点的数列．对于负定二次函数的优化问题,我 们给出了一些结果．     

Positive Quadratic Forms on Intersections of Quadrics

The positive definiteness of a quadratic form on the cone defined as the set of points at which given quadratic forms vanish or are nonnegative is studied. Necessary and sufficient conditions for the positivity of a quadratic form on this cone are obtained. The results are applied to study second-order sufficient conditions for abnormal extremal problems.     

On the Teichmüller theorem and the heights theorem for quadratic differentials

By using the Marden-Strebel heights theorem for quadratic differentials, we provide a concrete method for finding the Teichmüller differential associated with the Teichmüller mapping between compact or finitely punctured Riemann surfaces.

     

Some Remarks on Real and Algebraic Cobordism

We investigate connections between Real cobordism, algebraic cobordism, quadratic forms, the Rost Motive, Morava K(n)-theories and analogues of homotopy classes of Hopf invariant 1.     

Remarks on Two Approaches to the Horizontal Cohomology: Compatibility Complex and the Koszul–Tate Resolution

The Koszul–Tate resolution is described in the context of the geometry of jet spaces and differential equations. The application due to Barnich, Brandt, and Henneaux of this resolution to computing the horizontal cohomology is analyzed. Relations with the Vinogradov spectral sequence are discussed.