共查询到20条相似文献,搜索用时 15 毫秒
1.
构造了p 调和发展方程的初边值问题的一个整体弱解;证明了当初值u0(x)是弱p 调和映射但不是弱p 驻调和映射时问题弱解的不唯一性. 相似文献
2.
Guizhi Chen 《Numerical Algorithms》2004,35(1):91-96
This paper proposes a new shift scheme, called refined harmonic shifts, for use in the implicitly restarted refined harmonic Arnoldi method. Numerical experiments show that the implicitly restarted refined harmonic Arnoldi algorithm with refined harmonic shifts is better than the implicitly restarted harmonic Arnoldi algorithm with Morgan's harmonic shifts and the refined harmonic shifts are as efficient as Jia's refined shifts. 相似文献
3.
MingSheng Liu 《中国科学A辑(英文版)》2009,52(1):87-93
The Bloch constants for quasiregular harmonic mappings and open planar harmonic mappings are considered. Better estimates
are obtained. The results, presented in this paper, improve the one made by Chen et al. and Grigoryan.
This work was supported by the Research Foundation for Doctor Programme (Grant No. 20050574002) and the National Natural Science
Foundation of China (Grant No. 10471048) 相似文献
4.
在很多实际应用中需要计算大规模矩阵的若干个最小奇异组.调和投影方法是计算内部特征对的常用方法,其原理可用于求解大规模奇异值分解问题.本文证明了,当投影空间足够好时,该方法得到的近似奇异值收敛,但近似奇异向量可能收敛很慢甚至不收敛.根据第二作者近年来提出的精化投影方法的原理,本文提出一种精化的调和Lanczos双对角化方法,证明了它的收敛性.然后将该方法与Sorensen提出的隐式重新启动技术相结合,开发出隐式重新启动的调和Lanczos双对角化算法(IRHLB)和隐式重新启动的精化调和Lanczos双对角化算法(IRRHLB).位移的合理选取是算法成功的关键之一,本文对精化算法提出了一种新的位移策略,称之为"精化调和位移".理论分析表明,精化调和位移比IRHLB中所用的调和位移要好,且可以廉价可靠地计算出来.数值实验表明,IRRHLB比IRHLB要显著优越,而且比目前常用的隐式重新启动的Lanczos双对角化方法(IRLB)和精化算法IRRLB更有效. 相似文献
5.
The main purpose of the present paper is to study geometric properties of transversal (infinitesimal) harmonic transformations for Riemannian foliations. For the point foliation these notions are discussed in [14]. Especially we treat transversal infinitesimal harmonic transformations from the standpoint of λ-automorphisms. Our results extend those obtained in
[6, 7, 15] for the case of harmonic foliations.
Mathematics Subject Classifications (2000): Primary 53C20, Secondary 57R30. 相似文献
6.
赵振刚 《数学的实践与认识》2010,40(1)
在Rn中的有界域上建立加权调和Bergman核,并得出单位球的加权调和Bergman核的表达式;利用加权调和Bergman核在Rn的有界域上构造度量矩阵;得到关于调和映射的Jacobi矩阵与度量矩阵之间的一个不等式. 相似文献
7.
具有时滞的n维Lienard型方程的调和解 总被引:4,自引:0,他引:4
本文讨论具有周期扰动的n维时滞Lienard型方程p(t)的调和解.给出了存在调和解的若干充分条件,推广了GeWeigao(1991)文中的相关结果. 相似文献
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9.
本文对于半平面中的调和函数u(z),证明了正部u (z)满足某些限制增长条件,用半平面边界上的积分表示,它的负部u-(z)也被类似的增长条件所控制.得到了半平面中负的调和函数的经典结果. 相似文献
10.
For the torsion-free modules over noncommutative principal ideal domains von Staudt's theorem is proved. Moreover, more general (nonbijective) harmonic maps with the classical definition of harmonic quadruple is calculated. 相似文献
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12.
We consider multiply hyperharmonic functions on the product space of two harmonic spaces in the sense of Constantinescu and Cornea. Earlier multiply superharmonic and harmonic functions have been studied in Brelot spaces notably by GowriSankaran. Important examples of Brelot spaces are solutions of elliptic differential equations. The theory of general harmonic spaces covers in addition to Brelot spaces also solution of parabolic differential equations. A locally lower bounded function is multiply hyperharmonic on the product space of two harmonic spaces if it is a hyperharmonic function in each variable for every fixed value of the other. We prove similar results as in Brelot spaces, but our approach is different. We study sheaf properties of multiply hyperharmonic functions. Our main theorem states that multiply hyperharmonic functions are lower semicontinuous and satisfy the axiom of completeness with respect to products of relatively compact sets. We also study nearly multiply hyperharmonic functions. 相似文献
13.
首先给出了复$k$-hypergenic函数的几个等价条件,其中包括广义的Cauchy-Riemann方程.其次给出了复$k$-hypergenic调和函数的几个等价条件.
最后讨论了复$k$-hypergenic函数和复$k$-hypergenic调和函数的关系.例如,已知一个复$k$-hypergenic调和函数$u(z)$,则局部存在复$k$-hypergenic
函数$f(z)$, 使得$P_0f(z)=u(z)$. 相似文献
14.
基于指数型完全Bell多项式,建立了一个一般调和数渐近展开式,并给出展开式中系数的相应递推关系.由生成函数方法进一步推导出这些系数的具体表达式.另外,我们建立了两个在对数项里只含有奇数或偶数次幂项的lacunary调和数渐近展开式, 相似文献
15.
Zhen Gang Zhao 《数学学报(英文版)》2014,30(11):1977-1988
We obtain the explicit formulae for the harmonic Bergman kernels of Bn/{0} and Rn/Bn and study the connection between harmonic Bergman kernel and weighted harmonic Bergman kernel.We also get the explicit formula for the weighted harmonic Bergman kernel of Bn/{0} with the weight 1/|x|4. 相似文献
16.
Several theorems on the finiteness of energy for quasi-harmonic spheres are proved,some counter-examples which state that the energy of quasi-harmonic sphere may be infinite are given. The results support some conditions of a question posed by Lin Fanghua and Wang Changyou. 相似文献
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De Liang HSU Jia Yu LI 《数学学报(英文版)》2008,24(2):223-226
We prove a compactness theorem for k-indexed stationary harmonic maps, and show a regularity theorem for this kind of maps which says that the singular set of a k-indexed stationary harmonic map is of Hausdorff dimension at most m-3. 相似文献
20.
A complex-valued harmonic function that is univalent and sense preserving in the unit disk U can be written in the form of f = h + g,where h and g are analytic in U.We define and investigate a new class LH_λ(α,β) by generalized Salagean operator of harmonic univalent functions.We give sufficient coefficient conditions for normalized harmonic functions in the class LH_λ(α,β).These conditions are also shown to be necessary when the coefficients are negative.This leads to distortion bounds and extreme points. 相似文献