ON THE CONTACT COHOMOLOGY OF ISOLATED HYPERSURFACE SINGULARITIES

The author defines, using jets, cohomology $H^p(\Lambda _{f,k-})$ for hypersurfaces, which are invariant under contact transformations. For isolated hypersurface singularities, it is proved that $H^0(\Lambda _{f,k-})=O_{U,0}/f^{k+1}O_{U,0},$ $H^p(\Lambda _{f,k-})=0,1\leq p \leq N-3 or p=N,$ $dimH^{N-2}(\Lambda _{f,k-})-dimH^{N-1}(\Lambda _{f,k-})=\[\left( {\begin{array}{*{20}{c}} k \ N \end{array}} \right)\dim {O_{U,0}}/(f,\frac{{\partial f}}{{\partial {x_1}}}, \cdots ,\frac{{\partial f}}{{\partial {x_N}}}){O_{U,0}}\] $ The algorithm of computation for H^{N-2} and H^{N-1} is given, and it is proved that $H^{N-1}=0$ when f is quasi-homogeneous.     

THE WEINSTEIN CONJECTURE IN PRODUCT OF SYMPLECTIC MANIFOLDS

In this paper, using pseudo-holomorphic curve method, one proves the Weinstein conjecture in the product P_1 ×P_2 of two strongly geometrically bounded symplectic manifolds under some conditions with P_1. In particular, if N is a closed manifold or a noncompact manifold of finite topological type, our result implies that the Weinstein conjecture in CP~2×T*N holds.     

THE EXISTENCE OF J-HOLOMORPHIC CURVES AND APPLICATIONS TO THE WEINSTEIN CONJECTURE

61.IntroductionandandResultsWefirstrecallseveraldefinitionsin[1].Acontactstructtireonamanifoldisafieldofatangenthyperplanes(contacthyperplanes)thatis"nondegenerate"atanypoiflt,local1ysuchafieldisdefinedasthefieldofzerosofal-formcr,calledacontactform.Thenondegeneracy.conditionisthatdcrisnondegenerateonthehyperplanesonwhichcrvanishes,equivalently,in(2n l)-space:aA(da)"/o.Theimportantexampleofcontactmanifoldisthewell-knownprojectivecotangentbundlesdefindedaJsfollows:LetN=T*Mbethecotangentbundl…     

关于Thompson猜想与AAM猜想

本文研究了有限(几乎)单群的非交换图刻画问题.利用有限几乎单群的阶分量理论,证明了对于具有非连通素图的有限单群,AAM猜想成立,同时也证明了某砦几乎单群也能被其非交换图刻画.上述结果推广了文献f131的结果.

Abstract：

In this article,we discuss the characterization of some finite(almost)simple groups by their non-commuting graphs.By using the theory of order components of finite almost simple groups,we prove that AAM's conjecture is true for all finite simple groups with non-connected prime graphs.Moreover,we prove that some almost simple groups can be also characterized by their non-commuting graphs.All the above results generalize those results in[13].     

关于平面图的边着色猜想（英文）

在最大度为△的图G中，设γ表示能够△一边着色的边的最大部分，Albertson和Hass猜想：如果G是无桥平面图，且△=3和，则γ=1．我们对于n2=2证明了这个猜想为真．     

THE EXISTENCE OF {tf J}-HOLOMORPHIC CURVES ANDAPPLICATIONS TO THE WEINSTEIN CONJECTURE

The author first proves the existences of $J-$holomorphic curves in the symplectizations of Legendre fibrations and then as an application confirms the Weinstein conjectures on contact manifolds of Legendre fibrations. As a corollary,a new proof on the theorem due to Hofer, Viterbo, Gluck, Ziller, Weinstein and Ljusternik-Fet Theorem is provided, which is quite different from their original proofs.     

ON A PAIR OF NON-ISOMETRIC ISOSPECTRAL DOMAINS WITH FRACTAL BOUNDARIES AND THE WEYL-BERRY CONJECTURE

ＯＮＡＰＡＩＲＯＦＮＯＮＩＳＯＭＥＴＲＩＣＩＳＯＳＰＥＣＴＲＡＬＤＯＭＡＩＮＳＷＩＴＨＦＲＡＣＴＡＬＢＯＵＮＤＡＲＩＥＳＡＮＤＴＨＥＷＥＹＬＢＥＲＲＹＣＯＮＪＥＣＴＵＲＥＳＬＥＥＭＡＮ，Ｂ．Ｄ．ＣＨＥＮＨＵＡＭａｎｕｓｃｒｉｐｔｒｅｃ...     

关于Je(s)manowicz猜想的一个注记

本文研究了Je(s)manowicz于1956年提出的关于丢番图方程(1.1)解的猜想.利用数论中的一些方法,得到了丢番图方程(1.2)的所有正整数解,证明了Je(s)manowicz猜想在这类情况下的正确性.     

NEWMAN猜想的一个简单证明

本文研究了一个数论问题:Newman猜想.从连续整数m 1,m 2,…,m n组成的集合中选出n个子集合,运用组合数学方法,获得了Newman猜想的一个简单证明.     

关于商高数的Jemanowicz猜想

本文研究了商高数的Jemanowicz猜想的整数解问题.利用初等数论方法,获得了该猜想的两个新结果并给出证明,推广了文献[4–8]的结果.     

完全$r$部图乘积上的Graham猜想

图G的Pebbling数f(G)是最小的正整数n,使得不论n个Pebble如何放置在G的顶点上,总可以通过一系列的Pebbling移动把1个Pebble移到任意一点上,其中Pebbling移动是从一个顶点处移走两个Pebble而把其中一个移到与其相邻的一个顶点上.Graham猜测对于任意的连通图G和H有f(G×H)≤f(G)f(H).本文证明对于一个完全γ部图和一个具有2-Pebbleing性质的图来说,Graham猜想成立.作为一个推论,当G和H均为完全γ部图时,Graham猜想成立.     

关于广义Ramanujan-Nagell方程的一个猜想

本文研究广义Ramanujan-Nagell方程的正整数解.利用初等数论方法,证实了杨仕椿关于广义Ramanujan-Nagell方程的一个猜想.     

THE EULER EQUATION AND ONSAGER CONJECTURE

In this paper, we introduce the progress of the Euler equation and Onsager conjecture. We also introduce the Euler''s life, the researches about the incompressible Euler equation, and the Onsager conjecture.     

ON THE GLOBAL STABILITY CONJECTURE OF THE GENOTYPE SELECTION MODEL

In 1994, Grove, Kocic, Ladas, and Levin conjectured that the local stability and global stability conditions of the fixed point y = 1/2 in the genotype selection model should be equivalent. In this article, we give an affirmative answer to this conjecture and prove that local stability implies global stability. Some illustrative examples are included to demonstrate the validity and applicability of the results.     

图的中间图2-pebbling性质和Graham猜想

本文研究了图的2-pebbling性质和Graham猜想.利用图的pebbling数的一些结果,我们研究了路和圈的中间图具有2-pebbling性质,从而也证明了路的中间图满足Graham猜想.     

A SURVEY ON THE PERIODIC SOLUTIONS TO KAPLAN-YORKE TYPE DELAY DIFFERENTIAL EQUATION-I

Since 1974, studying the original delay differential equation given by Kaplan and Yorke is about the problem on the existence of its periodic solutions, there have been a series of interesting and significant results in the previous literature. In this paper, we present a survey of some basic results. Some interesting open problems are also     

关于Piazza等人的一个猜想的证明

Ｐｉａｚｚａ;Ｒｏｂｅｒｔｓ和Ｓｔｕｅｃｋｌｅ在１９９５年猜想:任何一个完全ｎ－部图是严格边－韧性图(ｓｔｒｉｃｔｌｙ ｅｄｇｅ－ｔｅｎａｃｉｏｕｓ ｇｒａｐｈ) 本文证明了这个猜想．     

ON THE CONJECTURE OF A.LINS, W.DE MELO AND C.C.PUGH

We have proved that Lienard equation with F(x) = -F(-x) has at most n limit cycles. Under the condition, an affirmative answer to A.Lins, W.de Melo and C.C.Pugh's conjecture is given.     

ON TAYLOR'S CONJECTURE ABOUT THE PACKING MEASURES OF CARTESIAN PRODUCT SETS

1.IntroductionInthegeometryoffractals,Hausdorffmeasurealiddimensionplayaveryimportantrole.Olltheotherhand,therecelltilltroductionofpackingmeasureshasledtoagreaterunderstandillgofthegeometrictheoryoffractals,aspackingmeasuresbehaveillawnythatis'dual'toHausdoofmeasure8inmanyrespectsl2].Forexample,denotingHausdorffdimellsionandpackingdimensionbydimandDimrespectively,wehavedim(ExF)2dimE dimF,whileDim(ExF)5DimE DimF.Itiswell-kllowenthatifECRm,FCR",thenH(ExFW1T2)2b'H((E,W1)H(FW2)forsome…