具有渐进非线性项的Kirchhoff型方程的正解（英文）

本文研究一类非线性Kirchhoff型方程.非线性项函数f(x, u)在无穷远处关于u是渐进线性或渐进非线性的.若位势函数V (x)和非线性项f(x, u)满足给定的条件,本文在工作空间缺乏紧性嵌入的情形下获得该方程正解的存在性.     

非线性最优化的一个自适应精度算法

§1.引论 考虑非线性最优化问题 infφ(u), (1)其中φ是定义在赋范线性空间E上的实值函数,C是E的一个子集。为了数值求解问题(1),可以先引进(1)的代价函数序列{φ~n(u)}。将求解具约束的问题化成求解一系列无约束最优化问题:     

谈二维随机变量的函数的分布函数

设二维随机变量 (X,Y)的概率密度为 f (x,y) ,二维随机变量的函数是 U =U(x,y) ,则U的分布函数为FU(u) =P{ U≤ u} = Gf (x,y) dxdy,G:u(x,y)≤ u,(-∞ 0 .将此…     

具奇异位势的半线性抛物方程Cauchy问题的奇异解

本文研究奇异半线性抛物方程ut-Δu+V1(x)u=V2(x)up,x∈Rn＼{0},t＞0的Cauchy问题解的存在性.这里,V1(x),V2(x)可以在原点具有奇性.利用Kato类函数和Green tight函数及不动点定理证明了问题存在正的奇异解,它在原点具有奇性.     

具有阻尼项的二阶半线性偏微分方程解的振动性

研究了一类具有阻尼项的二阶半线性偏微分方程div(A(x)‖▽u(x)‖p-2▽u(x))+〈■(x),‖▽u(x)‖p-2▽u(x)〉+C(x)u(x)p-2u(x)=0,p>1运用偏Riccati变换和H函数方法,获得了该方程解的振动性的若干充分条件.     

一类带有Neumann边值条件的拟线性椭圆外部问题的多解性

该文考虑下面的带有Neumann边值条件的拟线性椭圆外部问题-div(a(x)|▽u|p-2▽u)+b(x)|u|p-2u=λh1(x)|u|q-2u+h2(x)|u|r-2u+g(x),x∈Ω,u/n=0,x∈Ω其中1pN,1qprp*,p*=Np/(N-p),Ω是欧几里德空间(R~N,|·|)(N≥3)中的光滑外部区域,也就是说,Ω是某个带有C~(1,δ)(0δ1)边界的有界区域Ω'的补集,n是其边界Ω的单位外法向量,λ是一个正参数.由山路引理和Ekeland变分原理,我们得出:当函数a(x),b(x),h_1(x),h_2(x)和g(x)满足一定的条件时,该方程至少有两个非平凡弱解.     

带有位势的Schrdinger-Poisson系统解的存在性与多解性

该文讨论以下带有位势V的薛定谔-泊松(Schrdinger-Poisson)系统-△u+λVu+φu=f(x,u),x∈R~3,-△φ=u~2,x∈R~3,其中λ≥1是一个参数,位势函数V∈C(R~3,R+)满足比较一般的假设.当非线性项f在无穷远点是超四次的,并且空间嵌入缺乏紧性时,该文讨论了参数λ≥1充分大时问题解的存在性与多解性.也考虑了非线性性项f满足一般的次线性假设时问题无穷多个解的存在性.     

一类值得注意的函数——复合函数

如果y是u的函数,记为y=f(u),u又是x的函数,记为u=g(x),且g(x)的值域与f(u)的定义域的交集不空,则确定了一个y关于x的函数y=f[g(x)],这就是函数y=f(u)与u=g(x)的复合函数,而y=f(u)称为外函数,u=g(x)称为内函数.本文举例介绍复合函数问题的一些常见类型及解法. 1.求复台函数的定义域 关键是正确分析函数的复合层次,由里向外或由外向里逐层解决. 例1 已知f(x)的定义域为[0,1)若F(x)=f[log1/2(3-x)],则函数的定义域是     

关于具有阻尼项的扩散方程

文章研究了具有阻尼项的扩散方程?u/?t=div(ρα|▽u|p-2▽u)-a(x)|▽u|q,讨论了该方程的初边值问题解的存在性,其中α＞0,q＜p,ρ(x)=dist(x,?Ω)是空间变量到边界?Ω的距离函数,a(x)是已知非负有界函数.作者利用抛物正则化的方法,证明了方程弱解的存在性.通过对检验函数的适当选取,可...     

关于一类二阶非线性双曲型方程全离散有限元方法的稳定性和收敛性估计

1　引　　言考虑如下混合问题 :φ( x,u) utt- di,j=1 xi( aij( x,u) u xj) - di=1bi( x,u) uxi =f( x,u)　　　　　　　　　　　　　　　 ( x,t)∈Ω× [0 ,T]u( x,0 ) =0 ,　 ut( x,0 ) =0　　 x∈Ωu( x,t) =0　 ( x,t)∈ Ω× [0 ,T]( 1 .1 )这里 utt= 2 u t2 ,uxi= u xi;Ω是 Rd 中充分光滑的有界开域 ,边界 Ω光滑 .对于 φ( x,u)中仅含有 x,或 φ( x,u)≡ 1的线性或非线性双曲型方程的半离散或全离散有限元方法的研究已有 [1 ] -[4 ] .这些文献定义了线性[1 ] [4] 或非线性[2 ] 或预测—校正[4] 全离散有限元格式 ,然后将原方…     

Homogeneous numerical semigroups

We introduce the concept of homogeneous numerical semigroups and show that all homogeneous numerical semigroups with Cohen–Macaulay tangent cones are of homogeneous type. In embedding dimension three, we classify all numerical semigroups of homogeneous type into numerical semigroups with complete intersection tangent cones and the homogeneous ones which are not symmetric with Cohen–Macaulay tangent cones. We also study the behavior of the homogeneous property by gluing and shiftings to construct large families of homogeneous numerical semigroups with Cohen–Macaulay tangent cones. In particular we show that these properties fulfill asymptotically in the shifting classes. Several explicit examples are provided along the paper to illustrate the property.     

局部凸空间中的齐次嵌入子空间

在本文中，将齐次嵌入子空间概念引入了局部凸空间中，并讨论了它们了逼近性质．     

Stationary Random Measures on Homogeneous Spaces

This paper discusses stationary random measures on a homogeneous space and their Palm measures. It starts with such fundamental properties as the refined Campbell theorem and then proceeds to consider invariant transports, invariance and transport properties of Palm measures, and stationary partitions. A key tool is a transformation of random measures that permits the extension of recent results for stationary random measures on a group to the more general case of stationary random measures on a homogeneous state space.     

一类分数次次线性算子及其交换子在齐型空间上的弱Morrey-Herz空间上的有界性

本文研究了一类次线性算子及其交换子在齐型空间上的弱有界性的问题.利用齐型空间的基本性质以及给出的一类次线性算子及其分别与BMO函数,Lipschitz函数生成的交换子在L~p(X)上的弱有界性,证明了其在齐型空间上Morrey-Herz空间中的弱有界性.推广了该类算子在Morrey-Herz空间中的强有界性这一结果.     

Geodesic spheres and two-point homogeneous spaces

In the Osserman conjecture and in the isoparametric conjecture it is stated that two-point homogeneous spaces may be characterized via the constancy of the eigenvalues of the Jacobi operator or the shape operator of geodesic spheres, respectively. These conjectures remain open, but in this paper we give complete positive results for similar statements about other symmetric endomorphism fields on small geodesic spheres. In addition, we derive more characteristic properties for this class of spaces by using other properties of small geodesic spheres. In particular, we study Riemannian manifolds with (curvature) homogeneous geodesic spheres. Supported by the Akademie der Naturforscher Leopoldina.     

关于高阶整函数系数微分方程解的增长性的进一步结果

本文研究一类高阶整函数系数微分方程的增长性问题，当存在某个系数对方程的解的性质起主要支配作用时，得到了齐次与非齐次方程解的超级的精确估计及方程的解与小函数的关系。     

On constraint qualifications in nonlinear programming

In this paper we give conditions for deriving the inconsistency of an inequality system of positively homogeneous functions starting from the inconsistency of another one. When the impossibility of the starting system represents a necessary optimality condition for an inequality constrained extremum problem and the positively homogeneous functions involved have suitable properties of convexity, such conditions collapse into the well known constraint qualifications.     

Saddle representations of positively homogeneous functions by linear functions

We say that a positively homogeneous function admits a saddle representation by linear functions iff it admits both an inf-sup-representation and a sup-inf-representation with the same two-index family of linear functions. In the paper we show that each continuous positively homogeneous function can be associated with a two-index family of linear functions which provides its saddle representation. We also establish characteristic properties of those two-index families of linear functions which provides saddle representations of functions belonging to the subspace of Lipschitz continuous positively homogeneous functions as well as the subspaces of difference sublinear and piecewise linear functions.     

New Lagrangian Relaxation Based Algorithm for Resource Scheduling with Homogeneous Subproblems

Solution oscillations, often caused by identical solutions to the homogeneous subproblems, constitute a severe and inherent disadvantage in applying Lagrangian relaxation based methods to resource scheduling problems with discrete decision variables. In this paper, the solution oscillations caused by homogeneous subproblems in the Lagrangian relaxation framework are identified and analyzed. Based on this analysis, the key idea to alleviate the homogeneous oscillations is to differentiate the homogeneous subproblems. A new algorithm is developed to solve the problem under the Lagrangian relaxation framework. The basic idea is to introduce a second-order penalty term in the Lagrangian. Since the dual cost function is no longer decomposable, a surrogate subgradient is used to update the multiplier at the high level. The homogeneous subproblems are not solved simultaneously, and the oscillations can be avoided or at least alleviated. Convergence proofs and properties of the new dual cost function are presented in the paper. Numerical testing for a short-term generation scheduling problem with two groups of identical units demonstrates that solution oscillations are greatly reduced and thus the generation schedule is significantly improved.     

On diagonal common quadratic Lyapunov functions for sets of homogeneous cooperative systems

This paper deals with a class of switched homogeneous cooperative systems. We answer under what conditions there exists a diagonal common quadratic Lyapunov function (DCQLF) for sets of homogeneous cooperative systems. This problem is characterized by easily verifiable algebraic conditions. Namely, the existence of a DCQLF can be related to the properties of some determinants. Finally, some reduced results are presented.