非紧致复对称空间上平方函数算子的弱1-1有界性

利用复对称空间上热核的表达式,非紧致Ｒｉｅｍａｎｎ对称空间上热核的一个梯度估计及Ｓｔｒｏｍｂｅｒｇ的一个结果,证明了复对称空间上 Ｌｉｔｔｌｅｗｏｏｄ－Ｐａｌｅｙ平方函数算子的弱 １－１有界性．     

L—不分明拓扑空间的T1化

本文借助ａ－超闭滤与ａ－有限交性质对良紧性的刻画，构造性地给出了具Ｔ１分离性的不分明拓扑空间的Ｔ１紧化，所得结果以分明拓扑的Ｗａｌｌｍａｎ紧化为特款。     

Banach空间中多类1-集-压缩映象的逼近定理和不动点定理

本文证明了 Ｋｙ Ｆａｎ定理［１］对定义在 Ｂａｎａｃｈ空间中含有内点的有界闭凸子集上的１－集－压缩映象正确．１－集－压缩映象类包含凝聚映象、非扩张映象、半压缩映象、局部几乎非扩张映象和其它映象．作为定理的应用,得到了一些非自映象在许多众知边界条件下的不动点定理,改进和推广了许多作者的最近结果．     

U1－sr条件

本文讨论Ｕ１－ｓｒ条件，这一条件有益于计算环的Ｋ１群．得到主要结果为；（１）完全确定满足Ｕ１－ｓｒ条件的半局部环：（２）给出使ＥｎｄＲ（Ｍ）满足Ｕ１－ｓｒ条件的一个刻划；（３）引进比Ｕ１－ｓｒ更强的一个条件ＳＵ１－ｓｒ，利用上述结果证明了：若Ｒ∈ＳＵ１－ｓｒ，则Ｍｎ（Ｒ）∈Ｕ１－ｓｒ；（４）证明了对于满足ＳＵ１－ｓｒ的环Ｒ，Ｋ１Ｒ＝ＧＬ１（Ｒ）ａｂ．     

具有次亚B性质的ω_（α＋1）－紧T_1空间是ω_α－LindelOf空间

在本文中，我们证明了具有次亚Ｂ性质的ω＿（α＋１－）紧Ｔ＿１空间是ω＿α－Ｌｉｎｄｅｌｏｆ空间，此结果改进并推广了［１］中的主要结果。     

1—外平面图的边面全色数

一个平面图Ｇ被称为１－外平面图如果存在一个顶点ｕ 使得Ｇ－ ｕ 是一个外平面图．本文证明了Ｍｅｌｎｉｋｏｖ 的边面染色猜想对所有１－外平面图成立．     

样条空间S~μ_k（△）的维数

本文考虑了欧式空间Ｒ￣ｎ中任意单纯形剖分上的样条函数空间．证明了当ｋ≥（３μ＋１）２￣（ｎ－２）＋１时，计算任意单纯形剖分Δ上的ｋ次μ阶光滑样条空间的维数，可归结为计算每个σ－关联域（ｉ－单纯形σ∈Δ）Ｒ（σ）上的２￣（ｎ－ｉ－１）μ次μ阶光滑（ｉ≤ｎ－１）样条空间的维数。这里σ－关联域Ｒ（σ）是指Δ中所有包含σ的单纯形所成的单纯形剖分．     

半素环的(1,σ)导子扩张

本文给出了半素环的自同构和（ １,σ）导子的扩张命题,这推广了［１］中的一些结论,然后借助半素环的广义中心里的幂等元在（１,σ）导子扩张模上建立起拓扑空间,从拓扑学角度给出（１,σ）导子扩张模的结构定理．     

空间网格上的三次GC^1插值格式

本文得到了由三次参数多项式构造的ＧＣ＾１插值格式，该插值格式定义在由空间三角一菜和空间四边形构成的空间网格上，并通过该网格的所有网点，同时在每个网点处以事先给定的平面为切平面。     

关于强拓扑对偶多重Hilbert空间上连续线性算子的（C_0，1）－发展系

本文证明：若强对偶多重Ｈｉｌｂｅｒｔ空间上的（Ｃ＿０，１）－半群族的无穷小生成算子族是г－稳定的，则该半群族生成г－稳定的发展系．基于此，本文还得出了关于（Ｃ＿０，１）－发展系的一个摄动定理．     

On the geometry of the space of Sp(1)-instantons with Pontrjagin index 1 in the 4-sphere

The geometry of the space ofSp(1)-instantons with index 1 on the 4-sphere is considered. The Riemannian metric of this space is described and conclusions concerning the conformal structure are deduced.     

Uniformly non-1 n /(1) Orlicz spaces

A characterisation of uniformly non-1 _n ^/(1) Orlicz space is obtained intrinsically in terms of the Young function determining the Orlicz space. It is shown that a uniformally non-1 _n ^/(1) Orlicz space is reflexive. This work was supported in part by Air Force Grant G2A-152015.     

Uniqueness of weak solutions of 1+1 dimensional wave maps

In this paper, we prove that finite energy distributional solutions to the Cauchy problem of wave maps from 1+1 dimensional Minkowsky space to any complete Riemannian manifold are unique. Received July 4, 1996; in final form August 25, 1998     

Constructions of 1 1/2-designs from symplectic geometry over finite fields

In this paper, we construct some 1(1/2)-designs, which are also known as partial geometric designs, using totally isotropic subspaces of the symplectic space and generalized symplectic graphs. Furthermore, these 1(1/2)-designs yield six infinite families of directed strongly regular graphs.     

A cylinder theorem for a (1, 1)-geodesic affine hypersurface with non-flat induced connection

The purpose of this paper is to show a cylinder theorem for a (1, 1)-geodesic affine hypersurface to an affine space with non-flat induced connection.     

On Products of Property b1

In this note,we present that:(1)Let X=σ{Xα:α∈A} be|A|-paracompact (resp.,hereditarily |A|-paracompact).If every finite subproduct of {Xα:α∈A} has property b1 (resp.,hereditarily property b1),then so is X.(2) Let X be a P-space and Y a metric space.Then,X×Y has property b1 iff X has property b1.(3) Let X be a strongly zero-dimensional and compact space.Then,X×Y has property b1 iff Y has property b1.     

On the Asymptotically PT_(-1) Spaces

In this note, first, we show that the asymptotic subcone, the ultralimit, the completion of an asymptotically PT_(-1) space axe still an asymptotically PT_(-1) space. Secondly, we consider two kinds of metric spaces, which have been considered by Ibragimov and Gromov, respectively. We show that they are asymptotically PT_(-1) spaces under particular conditions, which provide some concrete examples of asymptotically PT_(-1) spaces.     

Dynamics of Axially Symmetric Perturbed Hamiltonians in 1:1:1 Resonance

We study the dynamics of a family of perturbed three-degree-of-freedom Hamiltonian systems which are in 1:1:1 resonance. The perturbation consists of axially symmetric cubic and quartic arbitrary polynomials. Our analysis is performed by normalisation, reduction and KAM techniques. Firstly, the system is reduced by the axial symmetry, and then, periodic solutions and KAM 3-tori of the full system are determined from the relative equilibria. Next, the oscillator symmetry is extended by normalisation up to terms of degree 4 in rectangular coordinates; after truncation of higher orders and reduction to the orbit space, some relative equilibria are established and periodic solutions and KAM 3-tori of the original system are obtained. As a third step, the reduction in the two symmetries leads to a one-degree-of-freedom system that is completely analysed in the twice reduced space. All the relative equilibria together with the stability and parametric bifurcations are determined. Moreover, the invariant 2-tori (related to the critical points of the twice reduced space), some periodic solutions and the KAM 3-tori, all corresponding to the full system, are established. Additionally, the bifurcations of equilibria occurring in the twice reduced space are reconstructed as quasi-periodic bifurcations involving 2-tori and periodic solutions of the full system.