不动点集为RP(2)∪L~1(p)的对合

(M3+ k,T)是在光滑闭流形上的一个非平凡光滑对合 ,它的不动点集为 RP(2 )∪ L 1 (p ) .本文给出了带对合的流形 (M3+ k,T)的协边类     

Khler流形上的Gilkey定理

在本文中,我们证明下列结果:设ω(g,h)是紧致复n维Khler流形M上由Khler度量g和M上Hermitian矢丛E的Hermitian结构h所确定的值为M上(p,q)型微分形式的r阶不变多项式函数,则当r相似文献   

紧流形上椭圆微分算子预解式的一致L~p-L~q估计

假设n和m是两个正整数,P(x,D)是定义在维数为n的紧致无边流形M上的一般m阶椭圆自伴微分算子.在一定条件下,本文主要证明微分算子P(x,D)的预解式的一致Lp-Lq估计,其中nm 2,(p,q)在Sobolev线上并满足1p-1q=m n,p 2(n+1)n+3,q 2(n+1)n-1.本文的一个核心引理是建立曲面Σx={ξ∈T*x(M):p(x,ξ)=1}上测度的Fourier变换衰减估计的具体表达式,并利用它来得到局部算子的一致Lp-Lq估计.     

七维透镜空间为不动点集的对合

设 ( M7+ k,T)是光滑闭流形上的一个非平凡光滑对合 ,它的不动点集为 7维透镜空间 L3( p) .本文首先计算了 L 3( p)上任意向量丛的全 Stiefel-Whitney类 ,其次讨论了 ( M7+ k,T)的存在性 ,在存在的情形下 ,给出了带对合的流形 ( M7+ k,T) 协边类 .     

紧流形上椭圆微分算子预解式的一致L^p-L^q估计——献给陆善镇教授75华诞

假设n和m是两个正整数,P（x,D）是定义在维数为n的紧致无边流形M上的一般m阶椭圆自伴微分算子.在一定条件下,本文主要证明微分算子P（x,D）的预解式的一致L^p-L^q估计,其中n〉m≥2,（p,q）在Sobolev线上并满足1/p-1/q=m/n,p≤2（n＋1）/n＋3,q≥2（n＋1）/n-1.本文的一个核心引理是建立曲面Σx={ξ∈Tx^＊（M）：p（x,ξ）=1}上测度的Fourier变换衰减估计的具体表达式,并利用它来得到局部算子的一致L^p-L^q估计.     

Boundedness of parabolic singular integrals and Marcinkiewicz integrals on Triebel-Lizorkin spaces

In this paper,we obtain the boundedness of the parabolic singular integral operator T with kernel in L(logL)1/γ(Sn-1) on Triebel-Lizorkin spaces.Moreover,we prove the boundedness of a class of Marcinkiewicz integrals μΩ,q(f) from ∥f∥ F˙p0,q(Rn) into Lp(Rn).     

对合不动点集为L~2(p)的流形

(M5+k,T) 是光滑闭流形上的一个非平凡光滑对合 ,它的不动点集为 5维透镜空间 L2 ( p) .本文讨论了 ( M5+k,T)的存在性 ,在存在的情形下 ,( M5+k,T)是协边的 .     

关于拟常曲率流形中子流形的不等式

拟常曲率黎曼流形V~(n+p)可由下面的黎曼曲率张量的形式来定义 本文的主要结果如下: 设M~n是V~(n+p)的子流形,且M~n的数量曲率R满足其中q≥n-2,是M~n的第二基本形式的模,则M~n的截面曲率不小于c,即K_M≥c. 特别地当V~(n+p)是常曲率流形时(即b=0),且如取q=n-2,则所得不等式已为B.Y.Chen和M.Okumura所证明。     

Stein流形上(p,q)型Koppelman-Leray-Norguet公式

设M是复n维Stein流形;并设开集D??M具有逐块C¹边界.本文利用陈度量和陈联络,把Stein流形上(0,q)形式的Koppelman-Leray-Norguet公式推广到(p,q)形式,并得到D上?-方程的解.最后,还给出了Stein流形上实非退化强拟凸多面体的Koppelman-Leray-Norguet公式及其?-方程的解.     

Bochner-Kaehler流形的Kaehler子流形

Bochner-Kaehler流形指Bochner曲率张量消失的Kaehler流形。常全纯截面曲率流形是它的特例。本文得到下面结果: 定理 设M是复n+p维Bochner-Kaehler流形M的复n(≥2)维紧Kaehler子流形。若M每点的所有截面曲率都大于M在该点的全纯截面曲率的上确界的1/8。则M是全测地的。 当M是复射空间CP~(n+p)时,这就是Ros A.和Verstraelen L.证明的K.Ogine猜测。郭孝英、沈一兵最近推广到局部对称的Bochner-Kaehler流行M,(科学通报1987年第2期)。     

On 3-Submanifolds of S^3 Which Admit Complete Spanning Curve Systems

Let M be a compact connected 3-submanifold of the 3-sphere S~3 with one boundary component F such that there exists a collection of n pairwise disjoint connected orientable surfaces S = {S_1, ···, S_n} properly embedded in M, ?S = {?S_1, ···, ?S_n}is a complete curve system on F. We call S a complete surface system for M, and ?S a complete spanning curve system for M. In the present paper, the authors show that the equivalent classes of complete spanning curve systems for M are unique, that is, any complete spanning curve system for M is equivalent to ?S. As an application of the result,it is shown that the image of the natural homomorphism from the mapping class group M(M) to M(F) is a subgroup of the handlebody subgroup Hn.     

$FI$-$t$-提升模和$t$-quasi-dual Baer模

本文引入$FI$-$t$-提升模和$t$-quasi-dual Baer模的概念并给出两者的联系.证明富足补模$M$为$FI$-$t$-提升模当且仅当$M$的每个完全不变$t$-coclosed子模为$M$的直和项当且仅当$\bar{Z}^{2}(M)$为$M$的直和项且$\bar{Z}^{2}(M)$为$FI$-$t$-提升模当且仅当$M$同时为$t$-quasi-dual Baer 模和$FI$-$t$-$\mathcal{K}$-模.     

L7（3）与GL7（3）的OD-刻画

对于任意一个有限群G,令π（G）表示由它的阶的所有素因子构成的集合.构建一种与之相关的简单图,称之为素图,记作Γ（G）.该图的顶点集合是π（G）,图中两顶点p,g相连（记作p～q）的充要条件是群G恰有pq阶元.设π（G）={P₁,p2,…,p_x}.对于任意给定的p∈π（G）,令deg（p）:=|{q∈π（G）|在素图Γ（G）中,p～q}|,并称之为顶点p的度数.同时,定义D（G）:=（deg（p₁）,deg（p₂）,…,deg（p_s））,其中p₁2<…相似文献   

Subsurface 1-distance of the Handleb o dy

For a handlebody H with ?H = S, let F  S be an essential connected subsurface of S. Let C(S) be the curve complex of S, AC(F) be the arc and curve complex of F, D(H)  C(S) be the disk complex of H and πF(D(H))  AC(F) be the image of D(H) in AC(F). We introduce the definition of subsurface 1-distance between the 1-simplices of AC(F) and show that under some hypothesis, πF(D(H))comes within subsurface 1-distance at most 4 of every 1-simplex of AC(F).     

Generalized Ejiri's Rigidity Theorem for Submanifolds in Pinched Manifolds

Let $M^{n}(n\geq4)$ be an oriented compact submanifold with parallel mean curvature in an $(n+p)$-dimensional complete simply connected Riemannian manifold $N^{n+p}$. Then there exists a constant $\delta(n,p)\in(0,1)$ such that if the sectional curvature of $N$ satisfies $\ov{K}_{N}\in[\delta(n,p), 1]$, and if $M$ has a lower bound for Ricci curvature and an upper bound for scalar curvature, then $N$ is isometric to $S^{n+p}$. Moreover, $M$ is either a totally umbilic sphere $S^n\big(\frac{1}{\sqrt{1+H^2}}\big)$, a Clifford hypersurface $S^{m}\big(\frac{1}{\sqrt{2(1+H^2)}}\big)\times S^{m}\big(\frac{1}{\sqrt{2(1+H^2)}}\big)$ in the totally umbilic sphere $S^{n+1}\big(\frac{1}{\sqrt{1+H^2}}\big)$ with $n=2m$, or $\mathbb{C}P^{2}\big(\frac{4}{3}(1+H^2)\big)$ in $S^7\big(\frac{1}{\sqrt{1+H^2}}\big)$. This is a generalization of Ejiri''s rigidity theorem.     

单位圆上解析系数的高阶复微分方程

The growth of solutions of the following differential equation ■ is studied, where A_j(z) is analytic in the unit disc D = {z : |z| 1} for j = 0, 1,..., k-1. Some precise estimates of [p, q]-order of solutions of the equation are obtained by using a notion of new[p, q]-type on coefficients.     

参数函数$\epsilon$取边际值时的$GCF_\epsilon$集

Let ∈ :N → R be a parameter function satisfying the condition ∈(k) + k + 1 > 0and let T∈ :(0,1] →(0,1] be a transformation defined by T∈(x) =-1 +(k + 1)x1 + k-k∈x for x ∈(1k + 1,1k].Under the algorithm T∈,every x ∈(0,1] is attached an expansion,called generalized continued fraction(GCF∈) expansion with parameters by Schweiger.Define the sequence {kn(x)}n≥1of the partial quotients of x by k1(x) = ∈1/x∈ and kn(x) = k1(Tn-1∈(x)) for every n ≥ 2.Under the restriction-k-1 < ∈(k) <-k,define the set of non-recurring GCF∈expansions as F∈= {x ∈(0,1] :kn+1(x) > kn(x) for infinitely many n}.It has been proved by Schweiger that F∈has Lebesgue measure 0.In the present paper,we strengthen this result by showing that{dim H F∈≥12,when ∈(k) =-k-1 + ρ for a constant 0 < ρ < 1;1s+2≤ dimHF∈≤1s,when ∈(k) =-k-1 +1ksfor any s ≥ 1where dim H denotes the Hausdorff dimension.     

New Class of Kirchhoff Type Equations with Kelvin-Voigt Damping and General Nonlinearity: Local Existence and Blow-up in Solutions

In this paper, we consider a class of Kirchhoff equation, in the presence of a Kelvin-Voigt type damping and a source term of general nonlinearity forms. Where the studied equation is given as follows\begin{equation*}u_{tt} -\mathcal{K}\left( \mathcal{N}u(t)\right)\left[ \Delta_{p(x)}u +\Delta_{r(x)}u_{t}\right]=\mathcal{F}(x, t, u).\end{equation*}Here, $\mathcal{K}\left( \mathcal{N}u(t)\right)$ is a Kirchhoff function, $\Delta_{r(x)}u_{t}$ represent a Kelvin-Voigt strong damping term, and $\mathcal{F}(x, t, u)$ is a source term. According to an appropriate assumption, we obtain the local existence of the weak solutions by applying the Galerkin's approximation method. Furthermore, we prove a non-global existence result for certain solutions with negative/positive initial energy. More precisely, our aim is to find a sufficient conditions for $p(x), q(x), r(x), \mathcal{F}(x,t,u)$ and the initial data for which the blow-up occurs.     

分数次积分交换子在非齐Morrey空间上的紧性

本文主要建立由分数次积分$I_{\gamma}$与函数$b\in\mathrm{Lip}_{\beta}(\mu)$生成的交换子$[b, I_{\gamma}]$在以满足几何双倍与上部双倍条件的非齐度量测度空间为底空间的Morrey空间上紧性的充要条件.在假设控制函数$\lambda$满足逆双倍条件下,证明了交换子$[b,I_{\gamma}]$为从Morrey空间$M^{p}_{q}(\mu)$到$M^{s}_{t}(\mu)$紧性当且仅当$b\in\mathrm{Lip}_{\beta}(\mu)$.     

基于有限辛空间的一致偏序集和Leonard对

设F_q为q个元素的有限域,q是一个素数的幂.令F_q~((2v))是F_q上的2v维辛空间,M(m,s;2v)表示辛群作用在F_q~((2v))上的子空间的轨道.L(m,s;2v)是M(m,s;2v)的子空间生成的集合.若按照子空间的包含关系来规定L(m,s;2v)的序,则得一偏序集,记为L_O(m,s;2v).本文,首先构造了L(m,s;2v)上的子偏序集L_O(m,s;2v),然后证明这个子偏序集是强一致偏序的.最后利用这个偏序集构造了Leonard对.