排序方式: 共有111条查询结果,搜索用时 0 毫秒
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Jing-na Li Xiao-feng Wang Zheng-an Yao 《应用数学学报(英文版)》2007,23(3):421-432
In this paper, we propose a model in studying soft ferromagnetic films, which is readily accessible experimentally. By using penalty approximation and compensated compactness, we prove that the dynamical equation in thin film has a local weak solution. Moreover, the corresponding linear equation is also dealt with in great detail. 相似文献
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Sh.Rezapour 《分析论及其应用》2003,19(2):130-135
We will define and characterize c-weakly Chebyshev subspaces of Banach spaces. We will prove that all closed subspaces of a Banach space X are ε-weakly Chebyshev if and only if X is reflexive. 相似文献
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对于如何无限逼近无理数的问题,现在已经有很多方法.例如丢番图逼近论、相似性、一致分布、线性无关、Bonach不动点等.但这些方法大多得用到高等数学中较深的知识.有没有一种较为简单的逼近法呢?下面就(?)一类无理数如何逼近问题介绍一种简单且易操作的方法. 相似文献
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The purpose of this paper is to characterize the pointwise rate of convergence for the combinations of Szász-Mirakjan operators using Ditzian-Totik modulus of smoothness. 相似文献
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Peichu Hu Chungchun Yang 《分析论及其应用》2005,21(2):101-117
In this paper, we will introduce some problems and results between Diophantine approximation and value distribution theory. 相似文献
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A fourth-order variational inequality of the second kind arising in a plate frictional bending problem is considered. By using regularization method, the original problem can be formulated as a differentiable variational equation, and the corresponding discrete FEM variational equation is presented afterwards. Abstract error estimates and error estimates of the approximation are derived in terms of energy norm and L^2-norm. 相似文献
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In this work,the well-known problem put forward by S N Bernstein in 1930 is studied in a deep step.An operator is constructed by revising double interpolation nodes.It is proved that the operator converges to arbitrary continuous functions uniformly and the convergence order is the best. 相似文献
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“函数的零点”是上海教育出版社高中一年级第一学期3.4节“函数的基本性质”中的内容,教学要求为:使学生理解用“二分法”求函数零点的算法思想,会借助计算器求函数零点的数值解.笔者在研究教材相关内容的过程中,发现一些值得思考的问题. 相似文献
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In this article, the generalized reflexive solution of matrix equations (AX = B, XC = D) is considered. With special properties of generalized reflexive matrices, the necessary and sufficient conditions for the solvability and the general expression of the solution are obtained. Moreover, the related optimal approximation problem to a given matrix over the solution set is solved. 相似文献