扭化的Atiyah-Singer算子(Ⅱ)

本文证明了从Ｄｏｌｂｅａｕｌｔ算子可以得出一个扭化的Ａｔｉｙａｈ－Ｓｉｎｇｅｒ算子,它与原来的算子具有相同的主象征．特别地,辛流形上的Ｄｏｌｂｅａｕｌｔ算子是一个扭化的Ａｔｉｙａｈ－Ｓｉｎｇｅｒ算子．     

de Rham－Hodge－Signature算子的局部指标定理

整体的Ａｔｉｙａｈ－Ｓｉｎｇｅｒ指标定理对于一般的椭圆微分算子都成立．但对于局部指标定理来说，人们只能对具体的算子给予证明．并且各种情况需个别处理．由［６］知本文中证得的ｄｅＲｈａｍ－Ｈｏｄｇｅ－Ｓｉｇｎａｔｕｒｅ算子的局部指标既不是α型也不是β型的．这和经典的椭圆算子情形不同．     

de Rham－Hodge－Signature算子的局部指标定理

整体的Ａｔｉｙａｈ－Ｓｉｎｇｅｒ指标定理对于一般的椭圆微分算子都成立．但对于局部指标定理来说，人们只能对具体的算子给予证明．并且各种情况需个别处理．由［６］知本文中证得的ｄｅＲｈａｍ－Ｈｏｄｇｅ－Ｓｉｇｎａｔｕｒｅ算子的局部指标既不是α型也不是β型的．这和经典的椭圆算子情形不同．     

扭化的Atiyah-Singer算子(Ⅰ)

本文证明黎曼流形上的deRham以及Signature算子都同构于扭化的Atiyah－Singer算子.这两类算子的局部指数定理和局部Lefschetz不动点公式都可以从扭化的Atiyah-Singer算子得到．     

Non-singularSaffman-taylorFinger1

Ｎｏｎ－ｓｉｎｇｕｌａｒＳａｆｆｍａｎ－ｔａｙｌｏｒＦｉｎｇｅｒ１ＫａｉＨｕａＺＨＡＯＨｕｉｄａｎＹＵ（Ｄｅｐａｒｔｍｅｎｔｏｆｐｈｙｓｉｃｓ，ＣｅｎｔｅｒｆｏｒＮｏｎｌｉｎｅａｒＳｃｉｅｎｃｅ，ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ１００...     

论优化问题的公理方法（Ⅲ）

在建立了可交换半群｛Ω，｝上的簇Ｆ及其上的第一类优化算子＊概念之后，得到本文主要结果定理４和定理５。然后证明了首Ｎ阶优化算子，非劣算子以及摹多项式簇上的算子［１，２］都是第一类优化算子，与它们相关的优化集合簇Ｎ－ＴＨ，ＰＡＲＥＴＯ及ＥＳＳＥＮＣＥ都是广义优选半域。让它们赋值于多阶段有向图上，它们都服从于嘉量原理     

p-亚正常算子的本质谱与拟相似

本文证明了每一个ｐ－亚正常算子Ａ,都相应存在一个亚正常算子 ,使得Ａ与 有相同的闭值域点、相同的本质谱和谱．由此推出如果Ａ是ｐ－亚正常算子,Ｂ是任一有界线性算子,若存在有界线性算子Ｘ有稠值域,使得ＸＢ＝ＡＸ,则σ（Ａ）（Ｂ）此外还证明了,如果Ａ是ｐ－亚正常算子且 Ｒ（Ａ）闭或ＫｅｒＡ＝ＫｅｒＡ*, Ｂ是任一有界线性算子,Ａ与Ｂ拟相似,则ｅ（Ａ）（Ｂ）．     

Hilbert空间上交换本质正规算子组的C_p－类扰动

本文证明了若Ｂ＝（Ｂ１，…，Ｂｎ）是Ｈｉｌｂｅｒｔ空间Ｈ上交换正规算子组，Ａ＝（Ａ１，…，Ａｎ）是Ｈ上交换本质正规算子组，Ｓｐ（Ｂ）Ｓｐｅ（Ａ），且Ｓｐ（Ｂ）的Ｈａｕｓｄｏｒｆｆ维数等于α，则对任意ε＞０及ｐ≥ｍａｘ（α＋ε，１），Ａ模Ｃｐ－近似酉等价于ＡＢ＝（Ａ１Ｂ１，……ＡｎＢｎ）．     

STEKLOV－POINCARE算子与自然积分算子及GREEN函数间的关系

ＳＴＥＫＬＯＶ－ＰＯＩＮＣＡＲＥ算子与自然积分算子及ＧＲＥＥＮ函数间的关系余德浩（中国科学院计算数学与科学工程计算研究所）ＯＮＲＥＬＡＴＩＯＮＳＨＩＰＢＥＴＷＥＥＮＳＴＥＫＬＯＶ－ＰＯＩＮＣＡＲＥＯＰＥＲＡＴＯＲＳＡＮＤＮＡＴＵＲＡＬＩＮＴＥＧＲＡＬ...     

STEKLOV－POINCARE算子与自然积分算子及GREEN函数间的关系

ＳＴＥＫＬＯＶ－ＰＯＩＮＣＡＲＥ算子与自然积分算子及ＧＲＥＥＮ函数间的关系余德浩（中国科学院计算数学与科学工程计算研究所）ＯＮＲＥＬＡＴＩＯＮＳＨＩＰＢＥＴＷＥＥＮＳＴＥＫＬＯＶ－ＰＯＩＮＣＡＲＥＯＰＥＲＡＴＯＲＳＡＮＤＮＡＴＵＲＡＬＩＮＴＥＧＲＡＬ...     

Bergman空间上Toeplitz算子的局部及Fredholm性质

本文讨论了Ｂｅｒｇｍａｎ空间上Ｔｏｅｐｌｉｔｚ算子的局部谱的关系．利用局部化原理给出了Ｔｏｅｐｌｉｔｚ算子拟换位子紧性的一个充分条件．给出了一类符号的Ｔｏｅｐｌｉｔｚ算子是Ｆｒｅｄｈｏｌｍ算子的充分条件．     

Bergman空间上Toeplitz算子的局部化

In this paper we characterize the essential spectra of Toeplitz operators on Bergman spaces by using Douglas‘ localization Theorem and obtain the local decomposition of the essential spectra of Toeplitz operators.     

H~2(S)上Toeplitz算子本质谱的局部分解

本文利用Ｂａｎａｃｈ代数中局部化原理给出了多复变Ｈａｒｄｙ空间上Ｔｏｅｐｌｉｔｚ算子是Ｆｒｅｄｈｏｌｍ算子的一个充分必要条件；同时给出了Ｔｏｅｐｌｉｔｚ算子本质谱的局部分解．     

Two-Dimensional Töplitz Operators with Measurable Symbols

For the complete algebra of two-dimensional Töplitz operators with measurable bounded symbols, we establish conditions necessary for the Fredholm property of the operators and prove results on the separation of singularities of the symbols. As a corollary, conditions sufficient for the Fredholm property are established for operators with symbols satisfying local conditions of sectorial type.     

Spectral analysis of singular ordinary differential operators with indefinite weights

In this paper we develop a perturbation approach to investigate spectral problems for singular ordinary differential operators with indefinite weight functions. We prove a general perturbation result on the local spectral properties of selfadjoint operators in Krein spaces which differ only by finitely many dimensions from the orthogonal sum of a fundamentally reducible operator and an operator with finitely many negative squares. This result is applied to singular indefinite Sturm-Liouville operators and higher order singular ordinary differential operators with indefinite weight functions.     

A local lifting theorem for subnormal operators

Criteria for the existence of lifts of operators intertwining subnormal operators are established. The main result of the paper reduces lifting questions for general subnormal operators to questions about lifts of cyclic subnormal operators. It is shown that in general the existence of local lifts (i.e. those coming from cyclic parts) for a pair of subnormal operators does not imply the existence of a global lift. However this is the case when minimal normal extensions of subnormal operators in question are star-cyclic.

     

Approximation Properties of a Special Class of Mathematical Expectation Operators

61-IntroductionLet(X.}"cNbeasequenceofindependentrandomvariableseachhavingthesamelatticepointdistributionwithprobabilityfunctionP(X,=a kh)=P*,expectationEX"=),l(x)andvarianceE(X"-ax")'=a2(x).WhereKeZ:={o,tl,l2,..'},a,harethepositivecon-stants,xeI=Y'=Ri8arealcontinuousparameter.LettheprobabilitydistributionofS,=ZX,beForacontinuousfunctionfontheinterval7'(possiblyinfinite)definethemathematicalex-pectationoperatorRemarks(l)UsingChebychev,sinequalitywegeteasily.(See[1,P,,,f,,.j)-(2)Manyo…     

Local smoothing estimates for some half-wave operators

In this paper we study the local smoothing estimates for some half-wave operators associated to nondegenerate convex hypersurfaces.     

Local residual-type error estimates for adaptive boundary element methods on closed curves

Considering the Galerkin boundary element methods and mesh families with bounded local mesh ratio we derive local error estimates such that the local error is bounded by a local residual together with some global terms which can be expected to be small. If the order of the boundary operator is non-negative and at most two, these estimates show that the local residual is a local error indicator. For the operators of the negative order we obtain the same conclusion if the mesh is β-regular. Our paper improves recent results of Wendland and Yu in several respects.