ON PJATECKII-SAPIRO PRIME NUMBER THEOREM

ＯＮ ＰＪＡＴＥＣＫＩI－SＡＰＩＲＯ ＰＲＩＭＥ ＮＵＭＢＥＲ ＴＨＥＯＲＥＭ ￥ＪＩＡＣＨＡＯＨＵＡＡｂｓｔｒａｃｔ：Ｉｔｉｓｐｒｏｖｅｄｔｈａｔ，ｆｏｒ１＜ｃ＜ｅ，ｔｈｅｒｅａｒｅｉｎｆｉｎｉｔｅｌｙｍａｎｙｐｒｉｍｅｓｏｆｔｈｅｆｏｒｍ［ｎ＇ｌ...     

软代数的素理想与同余关系

本文用软代数的素理想集刻划了软代数的每一个同余关系，并给出了软代数的同余理想用素理想集刻划的表达式。     

ON THE FUNCTIONAL-DIFFERENTIAL EQUATION OF THE DISTRIBUTION OF PRIME NUMBERS

1IntroductionsandStatementsInt-,iloIf)4-0'sCllorw'3I](see(ieVisme[4],Wright[:l]alldDriver[1])al,t}(}Inr)1,cdforil](lal[(lllrisl-,i(ital]yarlalyti(:itlI)rooftilt)prim(?number1,if(3or'3m5whi相似文献   

关于Fermat素数与L-函数的加权均值

本文研究了一类以Fermat素数为模的Dirichlet L-函数加权均值的计算问题. 利用初等方法以及Dirichlet 和的性质, 获得了一个有趣的计算公式.     

ON THE EXPLICIT COMPACT SCHEMES II: EXTENSION OF THE STCE/CE METHOD ON NONSTAGGERED GRIDS ON THE EXPLICIT COMPACT SCHEMES II: EXTENSION OF THE STCE/CE METHOD ON NONSTAGGERED GRIDS

1. IntroductionTills paper is interested in the genuinely nonlinear conserVation lawswith initial data u(0, x) = "o(x), x = (x', ...l x').It is well known that the above problem may not always have a smooth global solutinn even if the initial data no is adequately smooth[6]. Thus, we consider its weaksolutinn so that the Problem (1.1) Ililght have a global solution allowing discontinuities(e.g. shock wave.etc.). Moreover, the elltrOPy conditinn should be deposed inorder to single out a phyS…     

Hoffman-Wielandt定理的推广及应用

1　引言及记号用 Rn× n表示所有 n× n阶实矩阵的集合 ,用 Sn× n,Sn× n+及 Sn× n++分别表示所有 n×n实对称矩阵 ,实对称半正定矩阵及实对称正定矩阵的集合 ,用 Tr(M)表示矩阵 M的迹 ,对 A,B∈ Rn× n.定义其内积为 A×B=Tr(ATB) .考虑如下半正定线性互补问题 :求 X,Y∈ Sn× n使Y =L (X) +Q,X≥ O,Y≥ O,X× Y =0 ,(1)其中 Q∈ Sn× n,L :Sn× n→ Sn× n为线性算子 ,而 X≥ O表示 X∈ Sn× n+(O表示零矩阵 ) .若 L:Sn× n→Sn× n满足X× L (X)≥ 0 ,　　 X∈ Sn× n. (2 )则称其为单调算子 ,而相应的问题称为单…     

ON THE CONVERGENCE OF PARALLEL BFGS METHOD

ＯＮＴＨＥＣＯＮＶＥＲＧＥＮＣＥＯＦＰＡＲＡＬＬＥＬＢＦＧＳＭＥＴＨＯＤＣｈｅｎＺｈｏｎｇＦｅｉＰｕｓｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＷｕｈａｎＵｎｉｖｅｒｓｉｔｙ，Ｗｕｈａｎ４３００７２，Ｃｈｉｎａ．）ＺｈｏｕＹｕｎｃａｉ...     

斜变换ST的演化生成与快速算法

１．引言 含有“斜”基向量的正交变换（斜变换 ＳＴ）概念是由 Ｅｎｏｍｏｔｏ ＆ Ｓｈｉｂａｔａ（１９７１）提出的［１］．斜向量是一个在其范围内呈均匀阶梯下降的离散锯齿波形．对于亮度逐渐改变的图象,用斜向量来表示是适合的． Ｅｎｏｍｏｔｏ 　＆ 　Ｓｈｉｂａｔａ仅考虑了斜向量长度为 ４和 ８的情况．Ｐｒａｔｔ等人利用递推性将 ＳＴ推广到 Ｎ＝ ２ｍ阶的情形,给出了 ＳＴ的一般定义［２］,并与其它变换进行了比较［３］．ＳＴ已成功地用在图象编码上,而且在非正弦类交换编码的应用中,斜变换的效果最好［２,３］． Ａｈ…     

斜Haar类变换的演化生成与快速算法

1.引 言 Haar函数和Walsh函数是两类密切相关且十分重要的完备正交函数系,它们不仅在(离散)正交变换及其快速算法设计中起着重要的作用,而且在小波分析中占有重要地位:它们分别对应于Haar小波和Haar小波包.另外,它们还是遗传算法和密码学等涉及布尔函数或离散函数的学科之重要的理论分析工具.     

基于线性代数的大规模快速量纲分析算法及其在爆炸与冲击工程研究中的应用

量纲分析是科学研究,特别是工程应用中非常重要的一个理论分析工具.从E.Buckingham提出Π定理开始算起,量纲分析已有一百多年历史,其基本理论和方法已经非常成熟,在各个领域也取得了显著的成果并且仍然有着广泛的应用.然而,随着研究的深入,面对的问题越来越复杂和细致,人们越来越关注在传统量纲分析中忽略掉的一些所谓次要因素的影响,因此涉及的物理量变得越来越多,导致按传统的量纲分析方法处理时常常显得非常繁琐甚至困难.本文从线性代数的观点出发,将量纲分析转换为线性空间问题,通过矩阵运算,完成量纲分析的关键过程.给出了量纲分析对应的线性代数问题的基本定理,并基于这些定理建立了程序化的量纲分析算法,将原本复杂的量纲分析问题转化为借助计算机代数系统能够快速方便解决的矩阵运算问题.最后,结合笔者多年的工作经历,给出了上述方法在爆炸与冲击工程研究领域中的若干应用实例,详细表述了具体操作步骤,验证了算法的优越性.     

APPROXIMATE SOLUTION TO THE PARABOLIC EQUATIONS AND THEIR PICTURE DISPLAY ON THE COMPUTER

In this paper, we consider the approximate solution of the type Ⅰ , Ⅲ initial boundary valued problems of the second order linear parabolic partial differential equations. We use a new difference scheme by suitably combining the difference and the basic recursion of elements in the bivariate spline space S21(Δmn(2)) to construct the approximate solutions. We have proved their convengence. And we will give a flow diagraph to display curved surface on a computer, and give an example.     

ON THE EXISTENCE AND UNIQUENESS OF POSITIVE SOLUTIONS FOR A CLASSOF DEGENERATE ELLIPTIC SYSTEMS

ＯＮＴＨＥＥＸＩＳＴＥＮＣＥＡＮＤＵＮＩＱＵＥＮＥＳＳＯＦＰＯＳＩＴＩＶＥＳＯＬＵＴＩＯＮＳＦＯＲＡＣＬＡＳＳＯＦＤＥＧＥＮＥＲＡＴＥＥＬＬＩＰＴＩＣＳＹＳＴＥＭＳ￥ＣＨＥＮＺＨＥＮＴＡＯ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，Ｘｉａｎｇｔ...     

ON THE BREAKDOWNS OF THE GALERKIN AND LEAST-SQUARES METHODS

1　ＩｎｔｒｏｄｕｃｔｉｏｎＷｅｃｏｎｓｉｄｅｒｌｉｎｅａｒｓｙｓｔｅｍｓｏｆｔｈｅｆｏｒｍＡｘ=ｂ,(1 )ｗｈｅｒｅＡ∈ＣＮ×Ｎｉｓｎｏｎｓｉｎｇｕｌａｒａｎｄｐｏｓｓｉｂｌｙｎｏｎ Ｈｅｒｍｉｔｉａｎ .Ａｍａｊｏｒｃｌａｓｓｏｆｍｅｔｈｏｄｓｆｏｒｓｏｌｖｉｎｇ (1 )ｉｓｔｈｅｃｌａｓｓｏｆＫｒｙｌｏｖｓｕｂｓｐａｃｅｍｅｔｈｏｄｓ (ｓｅｅ[6] ,[1 3]ｆｏｒｏｖｅｒｖｉｅｗｓｏｆｓｕｃｈｍｅｔｈｏｄｓ) ,ｄｅｆｉｎｅｄｂｙｔｈｅｐｒｏｐｅｒｔｉｅｓｘｍ ∈ｘ0 +Ｋｍ(ｒ0 ,Ａ) ;(2 )ｒｍ ⊥Ｌｍ, (3)ｗｈｅ…     

非线性非自治系统的等度渐近稳定性

研究了非线性非自治系统平凡解的等度渐近稳定性。利用一个或两个Lyapunov函数得到了保证所给系统的平凡解等度渐近稳定性的几个充分判据,最后给出两个例子说明本文结果.     

ASYMPTOTIC BEHAVIOR OF THE TE AND TM APPROXIMATIONS TO SECOND HARMONIC GENERATION

We consider a Second Harmonic Generation （SHG） problem of an optical signal wave with an optical pump in a medium represented by a smooth bounded domain Ω→∩ IR^d which is assumed to contain a heterogeneous material： a compactly imbedded subdomain B^r →∩∩ in the shape of a small ball contains a nonlinear material, while Ω／ B^r is filled with a linear material. We begin by proving existence and uniqueness of the solution to the TE approximation of SHG for arbitrary bounded susceptibilities, thus improving the result obtained by Bao and Dobson （ Eur. J. Appl. Math. 6 （1995）, 573-590） under small enough susceptibilities assuption. We then establish an existence and uniqueness result of a solution to the TM approximation problem. In both parts we study the asymptotic behavior of the system as the size of the nonlinear material vanishes： error estimates and asymptotic expansion of the solution are derived for both TE and TM approximations.     

CONSERVATION OF THREE—POINT COMPACT SCHEMES ON SINGLE AND MULTIBLOCK PATCHED GRIDS FOR HYPERBOLIC PROBLEMS

For nonlinear hyperbloic problems,Conservation of the numerical scheme is important for convergence to the correct weak solutions.In this paper the the conservation of the well-known compact scheme up to fourth order of accuracy on a single and uniform grid is studied,and a conservative interface treatment is derived for compact schemes on patched grids .For a pure initial value problem,the compact scheme is shown to be equivalent to a scheme in the usual conservative form .For the case of a mixed initial boundary value problem,the compact scheme is conservative only if the rounding errors are small enough.For a pactched grid interface,a conservative interface condition useful for mesh fefiement and for parallel computation is derived and its order of local accuracy is analyzed.     

ON THE CONVERGENCE OF THE NONNESTED V-CYCLE MULTIGRID METHOD FOR NONSYMMETRIC AND INDEFINITE SECOND-ORDER ELLIPTIC PROBLEMS

This paper provides a proof for the uniform convergence rate （independently of the number of mesh levels） for the nonnested V-cycle multigrid method for nonsymmetric and indefinite second-order elliptic problems.     

真空感图形生成的加速技术研究及实现

引入了一种直线与三角形求交的简洁算法和区域块投影算法,有效地减少了真实感图形生成中光线与物体的求交计算时间。另外,采用区别对待高光区域和非高光区域等方法,解决了Ｇｏｕｒａｕｄ浓淡算法不能生成高光效果的问题,改善了图形质量。     

THE CALCULUS OF GENERATING FUNCTIONS AND THE FORMAL ENERGY FOR HAMILTONIAN ALGORITHMS

1.DarbouxTransformationConsidercotangentbundleT*R"acRZnwithnaturalsymplecticstructureandtheproductofcotangentbundles(T*R")x(T*R")=R4nwithnaturalproductsymplecticstructureCorrespondingly,weconsidertheproductspaceR"xR"rsRZn.ItscotangentbunT*(R"xR")=T*Rzn=R'nhasnaturalsymplecticstructure')PreparedbyQinMengzhaoChoosesymplecticcoordinatesz~(p,q)onthesymplecticmanifold,thenforsymplectictransformationg:T*R"~T*R",wehaveitisaLagrangiansubmanifoldofT*R"xT*RninR4n~(R'",J4.).NotethatonR4nth…     

Fuzzy格的中心核中理想与同余关系

本文通过提出软代数中心核概念，讨论了软代数中理想与同余关系的联系，证明了软代数的每个中理想，都存在相应的同余关系，使其中心核恰为该中理想；每个中理想都是某个满同态的中心核；并通过中心核，构造出了相应的最小与最大同余关系．