New Periodic Solutions for 3-body Problems

1 Introduction and the Main Results The motion of three bodies in R~2 is described by the following second order differentialequations: m_i_i+_(qi)V(q)=0, (1)where m_i>0 and q_i∈R~2 are the mass and the position of the i-th body,and V is the Newtonianpotantial V(q)=V(q_1,q_2,q_3)=-U(q)=-(2)     

二次与三次样条插值及其变分性质

记(k,m)为在内结点上的插值条件是以m阶导数形式给出的k次样条插值函数类。对于(2k,2m-1)和(2k-,2m)类插值的变分性质已有研究,但(2k,2m)和(2k-1,2m-1)类插值的变分性质尚未见讨论。本文试给出(2,0)和(3,1)类插值的某种变分性质,并对其余项作出较精确的估计。     

Blow-up of p-Laplacian evolution equations with variable source power

We study the blow-up and/or global existence of the following p-Laplacian evolution equation with variable source power ut(x,t)=div(|?u|~(p-2)?u)+u~(q(x)) in?×(0,T),where ? is either a bounded domain or the whole space R~N,and q(x) is a positive and continuous function defined in ? with 0q_-=inf q(x)=q(x)=sup q(x)=q_+∞.It is demonstrated that the equation with variable source power has much richer dynamics with interesting phenomena which depends on the interplay of q(x) and the structure of spatial domain ?,compared with the case of constant source power.For the case that ? is a bounded domain,the exponent p-1 plays a crucial role.If q_+p-1,there exist blow-up solutions,while if q_+p-1,all the solutions are global.If q_-p-1,there exist global solutions,while for given q_-p-1q_+,there exist some function q(x) and ? such that all nontrivial solutions will blow up,which is called the Fujita phenomenon.For the case ?=R~N,the Fujita phenomenon occurs if 1q_-=q_+=p-1+p/N,while if q_-p-1+p/N,there exist global solutions.     

二次插值样条及二次样条有限元解的超收敛性

一 一维二次样条(等距节点情形)的渐近性态 [0,1]上函数f的二次插值样条s(x)∈C~1[0,1],且s(0)=f(0),s(1)=f(1),s(x_i+1/2)f(x_i+h/2),其中h=1/N,x_i=ih,在(x_i,x_(i+1))上为二次多项式,(i=0,1,     

三次样条的Hermite-Birkboff插值

设Δ:0=x_0相似文献   

关于混合插值样条

本文中我们提出一类特殊的H-B插值问题,即所谓混合插值.我们首先讨论五次样条,它是将Meir和Sharma的缺插值样条中的二阶导数的逐点插值换成一阶导数与二阶导数的交替插值.然后又讨论了三次样条,将[3]中讨论的(p)型插值改成一阶导数及函数值本身在节点处的交替插值.我们研究了这两类样条的存在、唯一性,并得到了它     

有理真分式 P(x)/Q(x)展开成部分分式定理一种证法及启示

<正> 引理1 C(x)为m 次实多项式m<2k 则(C(x))/((x~2+px+q)~k)=(Ax+B)/((x~2+px+q)~k)+(N(x))/((x~2+px+q)~(k-1))(式中p~2-4q<0)A,B 为唯一确定的实数;N(x)为次数小于2(k-1)的实多项式.证假定引理成立,则有     

SYMMETRIES OF EQUATIONS q_(tt)=g(q,q_x,q_(xx),…) AND THE FORMAL COMPLETELY INTEGRABILITY OF BOUSSINESQ EQUATION

In this paper the symmetries of equations q_(tt)=g(q,q_1,q_2,…) are discussed, where q=q(x,t) and qi_=~iq/x~i. It is shown that if g=aq_s (q,…,q_r), a=const, s-r≥2, then any symmetry of the equation will be linear with respect to the term of highest order. Furthermore, if the equation can be reduced to a Hamiltonian equation, then pairs of its conserved densities are in involution. As an application of this result, the Boussinesq equation q_(tt)=q_4 6q_1q_2 q_2 is shown to be a formal completely integrable Hamiltonian equation.     

S_2~1(△_(mn)~((2)))上的整节点插值

[1]中提出一种二元样条的插值方法,后来[2]对此种方法进行了较深入的分析.[2]中区分了二种不同类型的插值点:基本插值点和附加插值点;也给出了两种不同类型的插值:整节点插值和半整节点插值。本文研究空间S_2~1(△_(mn)~((2)))上的整节点插值,讨论插值     

两类最优循环局部修复码的构造

局部修复码是一种能修复多个故障节点的纠删码,在分布式存储系统中被广泛使用,构造最优局部修复码是目前分布式存储编码理论研究的热点问题之一.文章利用有限域Fq上循环码构造了以下两类具有局部修复性(r,δ)的最优局部修复码:1)[3(q+1),3(q+1)-3δ+1,δ+2],其中 q ≡ 1(mod 6),r+δ-1=q+...     

Describing Neighborhoods of 5-Vertices in a Class of 3-Polytopes with Minimum Degree 5

Lebesgue proved in 1940 that each 3-polytope with minimum degree 5 contains a 5-vertex for which the set of degrees of its neighbors is majorized by one of the following sequences(6, 6, 7, 7, 7), (6, 6, 6, 7, 9), (6, 6, 6, 6, 11)(5, 6, 7, 7, 8), (5, 6, 6, 7, 12), (5, 6, 6, 8, 10), (5, 6, 6, 6, 17)(5, 5, 7, 7, 13), (5, 5, 7, 8, 10), (5, 5, 6, 7, 27), (5, 5, 6, 6,∞), (5, 5, 6, 8, 15), (5, 5, 6, 9, 11)(5, 5, 5, 7, 41), (5, 5, 5, 8, 23), (5, 5, 5, 9, 17), (5, 5, 5, 10, 14), (5, 5, 5, 11, 13).We prove that each 3-polytope with minimum degree 5 without vertices of degree from 7 to 10 contains a 5-vertex whose set of degrees of its neighbors is majorized by one of the following sequences: (5, 6, 6, 5, ∞), (5, 6, 6, 6, 15), and (6, 6, 6, 6, 6), where all parameters are tight.     

Book reviews

L.N. TREFETHEN and D. BAU, III,Numerical Linear Algebra,SIAM, Philadelphia, 1997G.-C. ROTA,Indiscrete Thoughts,Birkhäuser, Boston, 1997D.E. KEYES, A. SAMEH and V. VENKATAKRISHNAN, eds.Parallel Numerical Algorithms,Kluwer, Dordrecht, 1997A. KIRSCH,An Introduction to the Mathematical Theory of Inverse Problems,Springer, New York, 1996L.F. SHAMPINE, R.C. ALLEN, Jr. and S. PRUESS,Fundamentals of Numerical Computing,Wiley, New York, 1997C.W. UEBERHUBERNumerical Computation, 2 vols.Springer, Berlin, 1997W.G. McCALLUM et al.Multivariate Calculus,Wiley, New York, 1997ZHI-QUAN LUO, JONG-SHI PANG and D. RALPH,Mathematical Programs with Equilibrium Constraints,Cambridge University Press, Cambridge, 1996P.R. POPIVANOV and D.K. PALAGACHEV,The Degenerate Oblique Derivative Problem for Elliptic and Parabolic Equations,Akademie Verlag, Berlin, 1997     

Regularisierte Faltung von Distributionen. Teil 2: Eine Tabelle von Fundamentallösungen

Zusammenfassung In der folgenden Liste sollen einige häufig vorkommende Differentialoperatoren und ihre Fundamentallösungen in der Art einer Integraltafel zusammengefaßt werden. Dabei ist zu beachten, daß Fundamentallösungen im allgemeinen (d. h. ohne Zusatzbedingungen) nicht eindeutig bestimmt sind. In den meisten Fällen sind Berechnungsverfahren zur Herleitung der angegebenen Fundamentallösungen skizziert. DAbei wurden sowohl neue Methoden (z. B. Regularisierung, Penalisierung, regularisierte Faltung: 3, 6, 8, 10, 15, 22, 23, 24, 28, 31, 38, 40, 44, 48, 50, 51, 52, 64, 65, 68, 69, 72, 73) als auch neue Fundamentallösungen (15, 16, 20, 22, 23, 24, 31, 68, 69, 70) angegeben, deren Berechnung im 1. Teil (Abschnitt 3) aus Platzgründen nicht aufgenommen wurde. Die Berechnung von Fundamentallösungen mittelspartieller Fourier- oder Laplacetrans-formation, oder durch Spezialisierung in gewissen allgemeinen, von F. J. Bureau oder G. Herglotz angegebenen Integralen wurde außer Betracht gelassen und wird nicht zitiert. Für die Operatoren 26, 66, 67, 71, 74 und 77 wurden keine Fundamentallösungen angeschrieben, da entweder die entsprechende Literatur nur auszugsweise zur Verfügung stand oder die Formeln zu umfangreich sind.

---

Summary Similar to a table of integrals the following table contains some frequently occurring differential operators and their fundamental solutions. However one has to pay attention to the fact, that fundamental solutions are not given uniquely (i.e. without assuming further conditions). In most cases you find methods to derive the listed fundamental solutions. We give new methods (e.g. regularization, penalization, regularized convolution: 3, 6, 8, 10, 15, 22, 23, 24, 28, 31, 38, 40, 44, 48, 50, 51, 52, 64, 65, 68, 69, 72, 73) as well as new fundamental solutions (15, 16, 20, 22, 23, 24, 31, 68, 69, 70), whose computation is not contained in part one (section 3) for lack of space. The derivation of fundamental solutions bypartial Fourier- or Laplace Transformation, or by specializing certain general integrals given by F. J. Bureau or G. Herglotz is not taken into account. For the operators 26, 66, 67, 71, 74 and 77 no fundamental solutions are given either for the corresponding reference being only partially available or the formulas being too long.

     

某一类色唯一的K_4-同胚图

令K_4(i,j,k,l,m,n)表示两两三度点间的路长分别为i,j,k,l,m,n的K_4-同胚图.对6条路的长均大于1且有4条路的长相等其余两条路互不相等的K_4-同胚图的着色进行了研究,得到了一类色唯一的K_4-同胚图.     

Book reviews

Devroye, L.; L. Györfi: Nonparametric Density Estimation: the L1 View. John Wiley & Sons New York, Chichester, Brisbane, Toronto, Singapore 1985, XI, 356 p., £ 45.90, ISBN 0-471816469

Gericke, H.: Mathematik in Antike und Orient. Springer-Verlag Berlin, Heidelberg, New York, Tokyo 1984, 140.Abb., 4 Kartenskizzen, XII, 292 S., DNI 98,-, ISBN 3-540-11647-8

K. ITö (ed.) StochasticAnalysis. Proceedings of the Traniguchi Internationaloal Symposium on Stochastic Analysis, Katata and Kyoto, 1982. North-Holland Mathematical Library, Vol. 32, North-Holland Publishing Company, Amsterdam 1984, 488 pages, Dfl. 250.- ISBN 0-444-87588-3

Weizenbaum, J.: Die Macht der Computer und dic Ohnmaeht der Vernuutt, Suhrkamp Taschenbuch Wissenschaf't 274. Suhrkamp Verlag Frankfurt/M. 1978, 368 S., DM 16,-, ISBN 3-518-27874-6

Krylov, N.V.; R. Sh. Lipiser; A.A Novikov (eds.): Statistics and Control of Stochastic Processes. Steklov Seminar, 1984. Springer-Verlag Berlin, Heidelberg, New York, Tokyo 1985, XIII, 507 S., DM 198, -, ISBN 3.540-96101-1

Sachs, H. (ed.): Graphs, Hypergraphs and Applications. Proceedings of the Conference on Graph Theory held in Eyba, Oct. 1984.. 'I'eubner-Texte zur Mathematik 73 Teubner Verlagsgesellschaft Leipzig 1985, 224 S., 23,-M, ISBN 666275-5

Bhat, U. Narayan; Elements of Applied Stochastic Processes. 2. Ed. Jonoh Wilet & Sons New York, Chichester, Brisbane, Toronto, Singapore 1984, IX, 685 p., £ 52.00, ISBN 0-471-87826-X

Methods of Operations Research. Bd, 66. Verlag Anton Hain Meisenheim, Königstein 1985, 410 S., DM 120,-, ISBN 3..445..02400..6

Maier, T.: Intervall-Input-Ontput-Rechnung. Mathernat.ical Systems in Economics. 101. Verlag Anton Rain, Meisenheim GmbH InigiteinTs. 1985, X, 338 S., DM 72,-, ISBN 3-445-02399-9.

Sawaragi, Y.; H. Nakayama; T. Tanino: Theory of Multi-objective Optimization. Mathematics in Science and Engineering. 176. Academic Press Orlando, San Diego, New York, London, Toronto 1985, 320 pp., $ 48.00, ISBN 0-12-620370-9.

Krämer, W.: Trend in ökonometrischen Modellen. Mathematical Systems in Economics. 93. Athenaum/Hain Konigstein 1985, 172 S., DM 48,-, ISBN 3-445-02386-7.     

抽象空间中非时齐马氏过程的分析理论(Ⅰ)——连续性、可微性及柯氏方程式

<正> 马氏过程的分析理论(这是主要指马氏过程的转移函数及其对应的半群的分析理论),是马氏过程基本理论的一个重要组成部分,对时齐的马氏过程的分析理论,不论其状态空间是可数的或一般的,国内外作者都进行过大量研究,得到过一系列结果.然而,对     

半质环的交换性条件

本文对满足可变恒等式的半质环在某种有界条件下给出了一个判断环Ｒ交换性的简便准则，使文献［２－２７］中所有相应结果均成为其直接推论．此外，对不限有界的情况，也得到较为广泛的结论．     

Uniform meyer solution to the three dimensional cauchy problem for laplace equation

We consider the three dimensional Cauchy problem for the Laplace equation uxx(x,y,z)+ uyy(x,y,z)+ uzz(x,y,z) = 0, x ∈ R,y ∈ R,0 z ≤ 1, u(x,y,0) = g(x,y), x ∈ R,y ∈ R, uz(x,y,0) = 0, x ∈ R,y ∈ R, where the data is given at z = 0 and a solution is sought in the region x,y ∈ R,0 z 1. The problem is ill-posed, the solution (if it exists) doesn't depend continuously on the initial data. Using Galerkin method and Meyer wavelets, we get the uniform stable wavelet approximate solution. Furthermore, we shall give a recipe for choosing the coarse level resolution.     

Toader型平均与几种经典平均的确界

给出了最佳参数α_1,α_2,α_3,β_1,β_2,β_3∈R,使得双向不等式α_1Q(a,b)+(1-α_1)G(a,b)0且a≠b成立.其中A(a,b)=(a+b)/2,H(a,b)=2ab/(a+b),G(a,b)=(ab)~(1/2),Q(a,b)=((a~2+b~2)/2)~(1/2),C(a,b)=(a~2+b~2)/(a+b),T(a,b)=2/π∫_0~(π/2)(a~2cos~2t+b~2sin~2)~(1/2)tdt分别是两个正数a和b的算术平均,调和平均,几何平均,二次平均,反调和平均和Toader平均.