ON A CONJECTURE OF K. OGIUE FOR KAEHLER HYPERSURFACES

ＯＮ Ａ ＣＯＮＪＥＣＴＵＲＥ ＯＦ Ｋ． ＯＧＩＵＥ ＦＯＲ ＫＡＥＨＬＥＲ ＨＹＰＥＲＳＵＲＦＡＣＥＳ￥ＳＨＡＮＧＷＥＩＭＩＮＧＡｂｓｔｒａｃｔ：ＡｎａｆｆｉｒｍａｔｉｖｅａｎｓｗｅｒｔｏａｃｏｎｊｅｃｔｕｒｅｏｆＫ．Ｏｇｉｕｅｆｏｒｍｕｌａｔｅ...     

ON ONE CONJECTURE OF R. S. SINGH

In 1979 R. S. Singh(Ann. Statist, 1979, p. 890) made a conjecture concerning the convergence rate of EB estimates of the parameter θ in an one-dimensional continuous exponential distribution family, under the square loss function, the prior distribution family being confined to a bounded interval. The conjecture asserts that the rate cannot reach o(1/n) or even O(1/n). In this article, the weaker part of this conjecture(i. e. the o(1/n) part) is shown to be correct.     

关于Simon Fitzpatrick猜想

本文先就三种情况证明ＳｉｍｏｎＦｉｔｚｐａｔｒｉｃｋ猜想是正确的，后提出了我们的Ｓ－Ｆ型问题，并给予了肯定的回答。     

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．     

关于Mycielski图循环色数的猜想

通过引进Mycielski图点集的一类特殊划分,利用该划分在Mycielski图循环着色中的特点改进了如下猜想:完全图的Mycielski图的循环色数等于它的点色数.     

ON THE STABILITY CONJECTURE

目前微分动力体系理论中，一个主要问题是问关于离散体系的所谓稳定性推测是否成立.设\[{M^n}\]是一 \[n\]维紧致的\[{C^\infty }\]Riemann流形，\[Dif{f^ \bot }({M^n}{\kern 1pt} )\]是\[{M^n}{\kern 1pt} \]上所有\[{C^1}\]微拓变换作成的空间，赋以\[{C^1}\]拓扑.考虑一任给的\[f \in Dif{f^1}({M^n}{\kern 1pt} ){\kern 1pt} \]这推测说，在\[n \ge 2\]情况下，若\[f\]是结构稳定的，则它满足公理\[A\]及强勻断条件；若\[f\]是\[\Omega - \]稳定的，则它满足公理\[A\]及无环性条件.关于这里出现的名词，例如可参看[18]，[19]，[14]，[4]等.这推测即令在\[n = 2\]情况下，直到最近\[Ma\tilde ne{\kern 1pt} \]才在\[{\kern 1pt} \Omega (f) = {M^2}\]这一強的附加条件下证明过有正面的答案.这里\[\Omega (f)\]表\[f\]的非游荡集. 本文的一个目的是给出这推测在\[n = 2{\kern 1pt} {\kern 1pt} \]情况下的正面答案（没有\[\Omega (f) = {M^2}\]这附加假定).我们的主要结果如下： 定理1命\[f \in Dif{f^1}({M^2}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \].则：\[f\]结构稳定的必要条件是它满足公理A及强匀断条件;f是稳定的必要条件是它满足公理A及无环性条件. 这些条件的充分性也成立，见以前的[14]，[15]，[19].这样，我们就得出了\[f \in Dif{f^1}({M^2}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \]结构稳定与稳定的特征性质. 定理2 \[f \in Dif{f^1}({M^2}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \]是\[\Omega - \]稳定的，当且仅当它\[ \in {{\cal F}^*}({M^2}{\kern 1pt} )\] 这里\[{{\cal F}^*}({M^n}{\kern 1pt} )\]表所有具有下述性质的\[g \in Dif{f^1}({M^n}{\kern 1pt} ){\kern 1pt} \]作成的集合，即：\[g\]在\[Dif{f^1}({M^n}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} \]中有一邻域G使得，每一\[h \in G\]的周期点都是双曲的（或等价地，每一\[h \in G\] 都至多只有可数个周期点)。根据一些周知的论断，容易看出对于\[f \in Dif{f^1}({M^1}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \]，定理2的结论仍然成立.由此可看出，文献[8,383页]中提到的一问题在\[\dim {\kern 1pt} {\kern 1pt} {M^n} \le 2\]情况下的解答是肯定的文献[5,318页]中提到的一推测的微拓变换类比形式的答案也是正面的. 本文大部分内容(在较有限制的情况下)讨论了 \[{M^n}\]上的\[{C^1}\]切向量场，然后借助于通常的扭扩的办法完成上述定理1及2的证明.     

ON THE STABILITY CONJECTURE

目前微分动力体系理论中，一个主要问题是问关于离散体系的所谓稳定性推测是否成立.设\[{M^n}\]是一 \[n\]维紧致的\[{C^\infty }\]Riemann流形，\[Dif{f^ \bot }({M^n}{\kern 1pt} )\]是\[{M^n}{\kern 1pt} \]上所有\[{C^1}\]微拓变换作成的空间，赋以\[{C^1}\]拓扑.考虑一任给的\[f \in Dif{f^1}({M^n}{\kern 1pt} ){\kern 1pt} \]这推测说，在\[n \ge 2\]情况下，若\[f\]是结构稳定的，则它满足公理\[A\]及强勻断条件；若\[f\]是\[\Omega - \]稳定的，则它满足公理\[A\]及无环性条件.关于这里出现的名词，例如可参看[18]，[19]，[14]，[4]等.这推测即令在\[n = 2\]情况下，直到最近\[Ma\tilde ne{\kern 1pt} \]才在\[{\kern 1pt} \Omega (f) = {M^2}\]这一強的附加条件下证明过有正面的答案.这里\[\Omega (f)\]表\[f\]的非游荡集. 本文的一个目的是给出这推测在\[n = 2{\kern 1pt} {\kern 1pt} \]情况下的正面答案（没有\[\Omega (f) = {M^2}\]这附加假定).我们的主要结果如下： 定理1命\[f \in Dif{f^1}({M^2}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \].则：\[f\]结构稳定的必要条件是它满足公理A及强匀断条件;f是稳定的必要条件是它满足公理A及无环性条件. 这些条件的充分性也成立，见以前的[14]，[15]，[19].这样，我们就得出了\[f \in Dif{f^1}({M^2}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \]结构稳定与稳定的特征性质. 定理2 \[f \in Dif{f^1}({M^2}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \]是\[\Omega - \]稳定的，当且仅当它\[ \in {{\cal F}^*}({M^2}{\kern 1pt} )\] 这里\[{{\cal F}^*}({M^n}{\kern 1pt} )\]表所有具有下述性质的\[g \in Dif{f^1}({M^n}{\kern 1pt} ){\kern 1pt} \]作成的集合，即：\[g\]在\[Dif{f^1}({M^n}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} \]中有一邻域G使得，每一\[h \in G\]的周期点都是双曲的（或等价地，每一\[h \in G\] 都至多只有可数个周期点)。根据一些周知的论断，容易看出对于\[f \in Dif{f^1}({M^1}{\kern 1pt} ){\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} \]，定理2的结论仍然成立.由此可看出，文献[8,383页]中提到的一问题在\[\dim {\kern 1pt} {\kern 1pt} {M^n} \le 2\]情况下的解答是肯定的文献[5,318页]中提到的一推测的微拓变换类比形式的答案也是正面的. 本文大部分内容(在较有限制的情况下)讨论了 \[{M^n}\]上的\[{C^1}\]切向量场，然后借助于通常的扭扩的办法完成上述定理1及2的证明.     

ON A BRESAR-SEMRL CONJECTURE AND DERIVATIONS OF BANACH ALGEBRAS

In this paper, we answer a question on derivations of densealgebras of linear operators posed by Brear and emrl. Our theoremimplies the following result: let be a complex Banach algebra,and let d and g be continuous derivations of . If dg(x) is quasi-nilpotentfor every x , then dg(x)³ lies in the radical of for everyx . This result was proved by Brear and emrl with the additionalassumption gd = dg.     

NOTES ON ERDOS' CONJECTURE

Let Xn,n 1,be a sequence of independent random variables satisfying P(Xn = O) = 1 － P(Xn = an) = 1 － 1/pn,where an,n 1,is a sequence of real numbers,andpn isthenthprime,setFN(x)=P(N∑Xnn=1 x).The authors investigate a conjecture of Erdos in probabilistic number theory and show that in order for the sequence FN to be weakly convergent,it is both sufficient and necessary that there exist three numbers x0 and x1 ＜ x2 such that limsup(FN(x2) －FN(x1)) ＞ 0 holds,and Lo =N→∞ lim FN(x0) exists.Moreover,the authors point ont that they can also obtain the same N→∞ result in the weakened case of liminfP(Xn = 0) ＞ 0.n→∞     

ON A CONJECTURE OF F. NEVANLINNA CONCERNING DEFICIENT FUNCTION (II)

The paper proves on the basis of [1] the following theorem: Let $\[f(z)\]$ be an entire function of lower order $\[\mu < \infty \]$, and $\[{a_i}(z)(l = 1,2, \cdots ,k)\]$ be meromorphic functions which satisfy $\[T(r,{a_i}(z)) = o\{ T(r,f)\} \]$. If $$\[\sum\limits_{i = 1}^k {\delta ({a_i}(z),f) = 1\begin{array}{*{20}{c}} {({a_i}(z) \ne \infty )}&{(1)} \end{array}} \]$$ then the deficiencies $\[\delta ({a_i}(z),f)\]$ are equal to $\[\frac{{{n_1}}}{\mu }\]$, where $\[{n_i}\]$ is an integer,$\[l = 1,2, \cdots ,k\]$.     

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 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.     

一個H.Hopf推測的證明

<正> 假設一個有限複合形K上的定向S~2叢在K~3上有截面,那末Hopf從他的第二阻礙公式獲得了一個叢不變量△~4()∈H~4(K).Hopf曾經猜測過這個叢不變量與叢的4維示性類有關.本文的目的在證明這個推測是對的,更明確言之,應有     

ON A CONJECTURE CONCERNING k-HAMILTON-NICE SEQUENCES

ＯＮＡＣＯＮＪＥＣＴＵＲＥＣＯＮＣＥＲＮＩＮＧｋ－ＨＡＭＩＬＴＯＮ－ＮＩＣＥＳＥＱＵＥＮＣＥＳＬＩＵＹＩＰＩＮＧ（刘一平）；ＷＵＺＨＥＮＧＳＨＥＮＧ（吴正声）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＮａｎｊｉｎｇＮｏｒｍａｌＵｎｉｖｅｒｓｉ...     

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.     

关于Ky Fan的一个猜想

设ｆ（ｚ）为单位圆上的规范化的单叶凸像函数，Ｌ（Ｈ）为复Ｈｉｌｂｅｒｔ空间Ｈ上的Ｂａｎａｃｈ算子代数。本文证明了对于Ｌ（Ｈ）中双重可换的真收缩算子Ｔｔ（ｉ＝１，２），ｆ（Ｔ１）与ｆ（Ｔ２）的凸线性组合一定具有形式ｆ（Ｔ），此处Ｔ为Ｌ（Ｈ）中的真收缩算子，同时我们通过一简单例子说明“Ｔｔ双重可换”的条件是不能去掉的，这便回答了由ＫｙＦａｎ提出的一个问题。     

THE WEINSTEIN CONJECTURE ON C~1-SMOOTH HYPERSURFACE OF CONTACT TYPE

In this note a symplectic capacity of Hofer-Zehnder type that is only invariant under C1-symplectomorphisms is defined and all computation formulae for Hofer-Zehnder symplectic capacity obtained at present are proved still holding for it. As a consequence some results on Weinstein conjecture are generalized to C1-smooth hypersurface of contact type.