共查询到20条相似文献,搜索用时 62 毫秒
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本文研究了非齐次椭圆方程的障碍问题,给出了二阶非齐次障碍问题解的定义,利用Poincar啨不等式,获得非齐次障碍问题的解及其导数的一些性质,填补了对非齐次障碍问题研究的空白. 相似文献
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基于三角形上的两类正交展开 ,对二阶椭圆问题研究了任意m次三角形有限元解(对偶数m)及平均梯度(对奇数m)在对称点上的超收敛性 .除此之外 ,再没有其他与方程系数无关的超收敛点 . 相似文献
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赵杰 《数学物理学报(A辑)》2015,(3):525-533
该文研究了形如-div(A(x/ε,x/ε~2)▽u_ε)=f(x)的椭圆重复齐次化问题解的收敛性,得到了Dirichlet边界条件下解在W_0~(1,p)空间的收敛率.证明所用的技巧是基于得到算子格林函数的估计. 相似文献
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曲率障碍下一个四阶变分不等式的Morley元逼近 总被引:1,自引:0,他引:1
§1.引言 对于二阶椭圆变分不等式问题的有限元逼近,已有[3]和[5]等.相对而言,各种障碍下的四阶椭圆变分不等式问题的有限元逼近,研究工作却不多.特别,误差估计方面的工作更少.[6]对固支情形曲率障碍问题,构造了Morley元逼近,并给出了收敛性分析, 相似文献
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非线性问题有限元的超收敛性 总被引:1,自引:1,他引:0
陈传淼 《高等学校计算数学学报》1982,(3)
对线性椭圆边值问题有限元的超收敛性已有许多研究。它们大致可分为两类:一是直接研究有限元解在某些特殊点上“自然地”具有的超收敛性,另一类是利用有限元解作局部积分平均得到高精度数值。但是对非线性问题研究较少。本文在某些情形下证明了如下重要事实:上述超收敛性对非线性椭圆问题的有限元仍然成立(注。进一步结果可多看作者论文,Superconvergence of finite element approximations tonoulinear elliptic problems,1982年4月19—23日北京,中法有限元方法讨论会)。 相似文献
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介绍求解方形区域上具无界导数的一类二阶椭圆方程的Shortley-Weller有限差分逼近的收敛性与数值计算,考虑拟一致网格而保证了相应的矩阵为M矩阵.进一步证明了采用适当的坐标变换可加速近似解收敛,且最优加速效果取决于所考虑椭圆方程的系数取值.数值结果证实了所作分析. 相似文献
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在本文中讨论了外推法对椭圆一抛物奇异摄动问题数值解的应用,提高了解的精度,估出了精度的阶数,并对文[1]中的一致收敛性在附录中给出证明. 相似文献
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设$D$是一个非平凡的对称$(v,k,\lambda)$设计, $G$是$D$的一个自同构群.本文证明了如果$G$以二维典型群PSL$(2,q)$作为基柱且在$D$上的作用是旗传递和点本原的,那么设计$D$的参数只能为$(7, 3, 1)$, $(7, 4, 2)$, $(11, 5, 2)$, $(11, 6, 3)$或$(15, 8, 4)$. 相似文献
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Let F be a field of characteristic 0, Mn(F) the full matrix algebra over F, t the subalgebra of Mn(F) consisting of all upper triangular matrices. Any subalgebra of Mn(F) containing t is called a parabolic subalgebra of Mn(F). Let P be a parabolic subalgebra of Mn(F). A map φ on P is said to satisfy derivability if φ(x·y) = φ(x)·y+x·φ(y) for all x,y ∈ P, where φ is not necessarily linear. Note that a map satisfying derivability on P is not necessarily a derivation on P. In this paper, we prove that a map φ on P satisfies derivability if and only if φ is a sum of an inner derivation and an additive quasi-derivation on P. In particular, any derivation of parabolic subalgebras of Mn(F) is an inner derivation. 相似文献
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GF(q)是q个元的有限域,q是素数的方幂,n是正整数,GF(q~n)为GF(q)的n次扩张.用指数和估计的方法给出了3种情形下幂剩余正规元存在的充分条件,即(1)GF(q~n)中存在元ξ为GF(q)上的幂剩余正规元;(2)GF(q~n)中存在元ξ与ξ~(-1)同时为GF(q)上幂剩余正规元;(3)对GF(q~n)~*中任意给定的非零元a和b,GF(q~n)中存在元ξ与ξ~(-1)同时为GF(q)上d次幂剩余正规元,且满足Tr(ξ)=a,Tr(ξ~(-1))=b. 相似文献
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A graph $G$ without isolated vertices is a least common multiple of two graphs $H_1$ and $H_2$ if $G$ is a smallest graph, in terms of number of edges, such that there exists a decomposition of $G$ into edge disjoint copies of $H_1$ and $H_2$. The collection of all least common multiples of $ H_1 $ and $ H_2 $ is denoted by $ \LCM (H_1, H_2) $ and the size of a least common multiple of $ H_1 $ and $ H_2 $ is denoted by $ \lcm (H_1, H_2) $. In this paper $\lcm ( P_4, P_m\ \square\ P_n) $, $\lcm (P_4, C_m \ \square\ C_n)$ and $\lcm (K_{1,3}, K_{1,m}\ \square\ K_{1,n}) $ are determined. 相似文献
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BAHADURASYMPTOTICEFFICIENCYINASEMIPARAMETRICREGRESSIONMODEL¥LIANGHUA;CHENGPINGAbstract:TheauthorSgiveMLEθ1MLofθ1inthemodelY=θ... 相似文献
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Let M and N be nonzero subspaces of a Hilbert space H, and PM and PN denote the orthogonal projections on M and N, respectively. In this note, an exact representation of the angle and the minimum gap of M and N is obtained. In addition, we study relations between the angle, the minimum gap of two subspaces M and N, and the reduced minimum modulus of (I - PN)PM, 相似文献
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Wu Liangsen 《数学年刊B辑(英文版)》1988,9(1):27-31
Let $A$, $B$ be unital $\[{C^*}\]$-algebras.
$\[{\chi _A} = \{ \varphi |\varphi \]$ are all completely postive linear maps from $\[{M_n}(C)\]$ to $A$ with $\[\left\| {a(\varphi )} \right\| \le 1\]$ $}$.
$\[(a(\varphi ) = \left( {\begin{array}{*{20}{c}}
{\varphi ({e_{11}})}& \cdots &{\varphi ({e_{1n}})}\{}& \cdots &{}\{\varphi ({e_{n1}})}& \cdots &{\varphi ({e_{nn}})}
\end{array}} \right),\]$ where $\[\{ {e_{ij}}\} \]$ is the matrix unit of $\[{M_n}(C)\]$.
Let $\[\alpha \]$ be the natural action of $\[SU(n)\]$ on $\[{M_n}(C)\]$
For $\[n \ge 3\]$, if $\[\Phi \]$ is an $\[\alpha \]$-invariant affine isomorphism between $\[{\chi _A}\]$ and $\[{\chi _B}\]$, $\[\Phi (0) = 0\]$, then $A$ and $B$ are $\[^*\]$-isomorphic
In this paper a counter example is given for the case $\[n = 2\]$. 相似文献
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Let(X,Y),(X_1,Y_1),…,(X_n,Y_n)be iid.random vectors,where Y is one-dimensional.It is desired to estimate the conditional median(X)of Y,by use of Z_n={(X_i,Y_i),i=1,…,n}and X.Denote by(X,Z_n)the kNN estimate of(X),and putH_(nk)(Z_n)=E{|(X,Z_n)-(X)||Z_n},the conditional mean absolute error.This articalestablishes the optimal convergence rate of P(H_(nk_n)(Z_n)>ε),under fairly generalassumptions on(X,Y)and k_n,which tends to ∞ in some suitable way. 相似文献
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Values of new series sum(((2n-1)!ζ(2n))/(2n + 2k)!)α2n from n=1 to ∞,sum(((2n-1)!ζ(2n))/(2n+2k +1)!)β2n from n=1 to ∞ are given concerning ζ(2k + 1),where k is a positive integer,α can be taken as 1,1/2,1/3,2/3,1/4,3/4,1/6,5/6 and β can be taken as 1,1/2.Some previous results are included as special cases in the present paper and new series converges more rapidly than those exsiting results for α = 1/3,or α = 1/4,or α = 1/6. 相似文献
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Siberian Mathematical Journal - A subgroup $ A $ of a group $ G $ is $ G $ -permutable in $ G $ if for every subgroup $ B\leq G $ there is $ x\in G $ satisfying $ AB^{x}=B^{x}A $ .... 相似文献