共查询到20条相似文献,搜索用时 78 毫秒
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设m∈N且m≥2,f是单位圆盘D上的正规化双全纯函数,P:Cn-1→C是m次齐次多项式.研究了单位球上改进的Roper-Suffridge算子F(z)=(f(z1)+f'(z1)P(z0),[f'(z1)]1/mz0)',其中z0=(z2,z3…,zn).当m=2时,该算子由Muir引入.当P≡0和m=2时,此算子就是著名的Roper-Suffridge算子.给出了∥P∥分别满足不同条件时,改进的算子分别保持α次的殆星和α次的星形映射性质.此结果推广了最近许多已有结果,而且方法更易于操作.特别地,当f(z1)=z1和m=n=2时,这就导出了多复变几何函数论中构造具体实例的经典形式F(z)=(z1+a22,z2)'. 相似文献
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给出了三族模糊蕴涵算子分别称它们为L-λ-0(λ∈[21,1])、L-λ-G(λ∈[0,1])与L-λ-0-λ-G(λ∈[0,1])族模糊蕴涵算子。L-λ-0族算子包括Lukasiewicz(简称RLu)算子与R0算子,L-λ-G族算子包括RLu算子与Go。del(简称RG)算子,L-λ-0-λ-G族算子包括RLu算子、R0算子与RG算子。本文主要讨论L-λ-G(λ∈[0,1])族模糊蕴涵算子的伴随算子及其正则性。 相似文献
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§1.引言 设(Ω,(?),P)为一完备概率测度空间,(X,B(X))、(Y,B(Y))为二可测空间,其中(X,‖·‖)、(Y,‖·‖)为可分Banach空间,B(X)与B(Y)分别表示X与Y的开子集所产生的Borel-σ-代数。映射x:Ω→X称为可测的,如果对任B∈(?)(X),考虑带随机参数的方程 相似文献
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蹇明 《数学物理学报(A辑)》2002,22(3):342-347
该文在经典函数的正族理论基础上建立了随机解析算子函数的正族、一致有界和等度连续等概念,并在此意义下,给出了随机解析算子函数族内闭一致有界与等度连续、正族与一致有界的关系,以及随机解析算子函数族为正族的一个充分必要条件。 相似文献
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设B(H)是复Hilbert空间H上的有界线性算子全体且dim H≥2.本文证明了B(H)上的线性满射φ保持两个算子乘积非零投影性的充分必要条件是存在B(H)中的酉算子U以及复常数λ满足λ~2=1,使得φ(X)=λU~*XU,(?)X∈B(H).同时也得到了线性映射保持两个算子Jordan三乘积非零投影的充分必要条件. 相似文献
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设X是具有无限重复度的无限维或维数不小于3的有限维复Banach空间,B(X)是X上全体有界线性算子组成的Banach代数.首先证明了单位算子不能表示成3个平方幂零算子之和,利用算子分块矩阵技巧获得了平方幂零算子的本质特征.以此特征为基础,刻画了B(X)上双边保持二次算子可加满射的结构. 相似文献
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This paper concerns a Markov operator T on a space L1, and aMarkov process P which defines a Markov operator on a spaceM of finite signed measures. For T, the paper presents necessaryand sufficient conditions for:
- a the existence of invariant probabilitydensities (IPDs)
- b the existence of strictly positive IPDs,and
- c the existence and uniqueness of IPDs.
- b the existence of strictly positive IPDs,and
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S. R. Blackburn 《Designs, Codes and Cryptography》1996,9(3):251-256
A sequence of elements from a finite field satisfies the shift and add property if the componentwise sum of any two shifts of the sequence is either a shift of the sequence or the all zero sequence. A sequence whose elements lie in an arbitrary group satisfies the shift and multiply property if the componentwise product of any two shifts of the sequence is either a shift of the sequence or the all identity sequence. The paper classifies sequences which have the shift and add property or the shift and multiply property. 相似文献
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Xue Yinchuan 《数学季刊》1996,(1)
On the Approximation by the Iterates of Stancu Operators and Its Modified OperatorsOntheApproximationbytheIteratesofStancuOpe... 相似文献
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Yong-Kui Chang Zhi-Han Zhao Juan J. Nieto 《Numerical Functional Analysis & Optimization》2013,34(12):1219-1238
This article is mainly concerned with the existence and uniqueness of almost periodic and pseudo almost periodic mild solutions to a class of partial differential equations in Banach spaces. Under some reasonable assumptions, the main results are proved in α-norm. Our results cover the cases that the functions F 1; F 2 take values in different spaces such as X, X α, and X ß, where α ≤ β ∈ (0; 1). 相似文献
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本文讨论两参数随机过程的马氏性问题,发现了两参数过程X的单点马氏性与X_t~1、X_s~2的马氏性间的关系,两参数中心高斯过程Y的*-马氏性与Y_t~1、Y_s~2的马氏性间的关系. 相似文献
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This paper focuses on discussing some basic properties of the weighted Markov branching process which is a natural generalisation
of the ordinary Markov branching process. The regularity and uniqueness criteria, which are very easy to verify, are firstly
established. Some important characteristics regarding the hitting times of such structure are obtained. In particular, the
closed forms for the mean extinction time and conditional mean extinction time are presented. The explosion behaviour of the
process is investigated and then the mean explosion time is derived. The mean global holding time and the mean total survival
time are also obtained.
AMS 2000 Subject Classification Primary 60 J27; Secondary 60 J80 相似文献
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Haiyan Cai 《Journal of computational and graphical statistics》2013,22(2):353-372
Abstract In this article, Swendsen–Wang–Wolff algorithms are extended to simulate spatial point processes with symmetric and stationary interactions. Convergence of these algorithms is considered. Some further generalizations of the algorithms are discussed. The ideas presented in this article can also be useful in handling some large and complicated systems. 相似文献
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该文研究一类含Baouendi-Grushin算子的p-Laplace方程解的存在性与对称性问题.通过重排方程对应的极小化约束泛函,得到此泛函关于某点中心对称的最小极值,从而获得方程正解的一些存在性和对称性结果.此结论推广了经典p-Laplace方程和Baouendi-Grushin型Laplace方程的相关结果. 相似文献