二阶奇摄动边值问题

本文应用上下解方法研究了边值问题εy"=f(t,y,ε),L(y(0),y'(0),ε)=0,R(y(1),y'(1),ε)=0(含一般的Robin问题)的解的存在性,唯一性和估计.     

On the Van Vleck theorem for limit-periodic continued fractions of general form

J. Koolen posed the problem of studying distance-regular graphs in which neighborhoods of vertices are strongly regular graphs with nonprincipal eigenvalue at most t for a given positive integer t. This problem was solved earlier for t = 3. In the case t = 4, the problem was reduced to studying graphs in which neighborhoods of vertices have parameters (352,26,0,2), (352,36,0,4), (243,22,1,2), (729,112,1,20), (204,28,2,4), (232,33,2,5), (676,108,2,20), (85,14,3,2), or (325,54,3,10). In the present paper, we prove that a distance-regular graph in which neighborhoods of vertices are strongly regular with parameters (85, 14, 3, 2) or (325, 54, 3, 10) has intersection array {85, 70, 1; 1, 14, 85} or {325, 270, 1; 1, 54, 325}. In addition, we find possible automorphisms of a graph with intersection array {85, 70, 1; 1, 14, 85}.     

ON THE WEIGHTED VARIABLE EXPONENT AMALGAM SPACE W（L^p（x）, Lm^q）

In [4], a new family W（L^p（x）, Lm^q） of Wiener amalgam spaces was defined and investigated some properties of these spaces, where local component is a variable exponent Lebesgue space L^p（x） （R） and the global component is a weighted Lebesgue space Lm^q （R）. This present paper is a sequel to our work [4]. In Section 2, we discuss necessary and sufficient conditions for the equality W （L^p（x）, Lm^q） = L^q （R）. Later we give some characterization of Wiener amalgam space W （L^p（x）, Lm^q）.In Section 3 we define the Wiener amalgam space W （FL^p（x）, Lm^q） and investigate some properties of this space, where FL^p（x） is the image of L^p（x） under the Fourier transform. In Section 4, we discuss boundedness of the Hardy- Littlewood maximal operator between some Wiener amalgam spaces.     

典型域上R—W多项式及内函数的存在性

该文给出了多复变四类典型域（m，n）,（n）,(2k),（3）及(n)上的R－W型多项式,并证明了这些区域上内函数的存在性．     

某些线性积分微分方程

本文讨论[1]中处理粘弹性杆非线性固有值问题时遇到的一些线性积分微分方程。它们在已有的文献中似不曾系统地被研究过。也缺乏这里的一般性。     

量子Yang-Baxter方程的1/2旋子的奇异上三角型解(Ⅱ)(英文)

In these two papers (Ⅰ) and (Ⅱ),the singular upper triangle type solutions with spin 1/2 of quantum Yang-Baxter equation are given.In the Paper (Ⅱ),we give the general solutions of the Yang-Baxter equation in this case.     

Stationary Markov chains with linear regressions

In Bryc (Ann. Probab., (1998), to appear), we determined one-dimensional distributions of a stationary field with linear regressions (1) and quadratic conditional variances (2) under a linear constraint (7) on the coefficients of the quadratic expression (3). In this paper, we show that for stationary Markov chains with linear regressions and quadratic conditional variances the coefficients of the quadratic expression are indeed tied by a linear constraint which can take only one of the two alternative forms (7), or (8).     

似然距离之间的近似等量关系

本文研究了线性回归模型的影响分析中常用的三种重要的诊断统计量,即似然距离LD_i(β,σ~2),LD_i(β|σ~2)和LD_i(σ~2|β)之间的关系.利用对数函数ln(1+χ)的马克劳林展开,在非线件最小二乘回归模型中得到了LD_i(β,σ~2)≈LD_i(β|σ~2)+LD_i(σ~2|β),类似的近似关系式对包括非线性分位点回归在内的一类较为广泛的统计模型都成立一个线性和一个非线性数据实例的分析结果很好地说明了我们的结论.     

SOME NEW RESULTS FOR NONLINEAR BOUNDARY VALUE PROBLEMS OF MIXED TYPE INTEGRODIFFERENTIAL EQUATION

In this paper we give the existence and uniqueness of solutions for boundary value problems of the form u" = f(t, u,u', T1u,T2u), g(u(0),u(1)) = 0, h(w(0), u(1),u'(0), u'(1)) = 0 by means of the upper and lower solution method.     

Entry strategies for multinational enterprises and host countries

A multinational enterprise (MNE) has a number of investment strategies to enter into a foreign market, such as foreign direct investment (FDI), joint venture (JV), exclusive licensing (EL), and others. In contrast, a host government also has the choice to introduce a suitable entry strategy into its local market, with the objective of maximizing its tax revenue or national social welfare. In this paper, we explore the optimal strategies for not only a MNE but also a host country.     

基于指数回归模型的极值指数估计的门限选择

在本文中,我们基于指数回归模型,在渐近最小均方误差的准则下,给出了矩估计的门限值和样本点分割的选取原理和方法。利用MC方法,对Burr(1,1,1)、Burr(1,0.5,2)、Fréchet(1)、Fréchet(2)、学生-t4、学生-t6等几种常见的极值分布进行模拟,得到了理想的结果。并运用S&P500指数和Danish火灾数据进行了实证分析。     

On the Generalization of Vladimirov and Wightman Generalized Functions

In this article we generalize to Rⁿ the Vladimirov generalized functions and the Wightman-type generalized functions. Our results are the formulae (I,1;1), (I,1;3), (I,1;4), (I,1;5), (I,2;1), (II,1;2), (II,1;3), (II,1;4), and (II,1;6). Here, we also introduce an n - dimensional multiplicative products of the Wightman-type generalized functions (cf. formula (II,2;4)).     

Nevanlinna theory through the Brownian motion

In this paper, we introduce the Nevanlinna theory using stochastic calculus, following the works of Davis(1975), Carne(1986) and Atsuji(1995, 2005, 2008 and 2017), etc. In particular, we give(another) proofs of the classical result of Nevanlinna for meromorphic functions and the result of Cartan-Ahlfors for holomorphic curves by using the probabilistic method.     

Dual Pairs in the Pin-Group and Duality for the Corresponding Spinorial Representation

Algebras and Representation Theory - In this paper, we give a complete picture of Howe correspondence for the setting (O(E, b), Pin(E, b),π), where O(E, b) is a real orthogonal group, Pin(E,...     

On the Distribution of the Digits in Lüroth Expansions

Lithuanian Mathematical Journal - For x ∈ [0, 1), let [d1(x), d2(x), . . .] be its Lüroth expansion, and let {pn(x)/qn(x)}n≥1 be the sequence of convergents of x. In this paper, we...     

Short proofs for two theorems of Chien,Hell and Zhu

In (J Graph Theory 33 (2000), 14–24), Hell and Zhu proved that if a series–parallel graph G has girth at least 2?(3k?1)/2?, then χ_c(G)≤4k/(2k?1). In (J Graph Theory 33 (2000), 185–198), Chien and Zhu proved that the girth condition given in (J Graph Theory 33 (2000), 14–24) is sharp. Short proofs of both results are given in this note. © 2010 Wiley Periodicals, Inc. J Graph 66: 83‐88, 2010 Theory     

Isotropic affine spheres

In this paper, we study affine spheres which are isotropic and we obtain a complete classification. In particular, we show that all such affine spheres are hyperbolic affine spheres, isometric with SL(3 , R ) / SO(3), SL(3 , C ) / SU(3), SU*(6) / Sp(3) or E6 (-26) /F4 .     

Feebly Projectable Algebraic Frames and Multiplicative Filters of Ideals

In the article (Martinez and Zenk, Algebra Universalis, 50, 231–257, 2003.), the authors studied several conditions on an algebraic frame L. In particular, four properties called Reg(1), Reg(2), Reg(3), and Reg(4) were considered. There it was shown that Reg(3) is equivalent to the more familiar condition known as projectability. In this article we show that there is a nice property, which we call feebly projectable, that is between Reg(3) and Reg(4). In the main section of the article we apply our notions to the frame of multiplicative filters of ideals in a commutative ring with unit and give characterizations of several well-known classes of commutative rings.     

ON GROWTH FACTORS OF THE LU FACTORIZATION

In this article, we derive upper bounds of different growth factors for the LU factorization, which are dominated by A11(k)-1A12(k),A21(k)A11(k)-1, where A11(k), A12(k), A21(k), A22(k) are sub-matrices of A. We also derive upper bounds of growth factors for the Cholesky factorization. Numerical examples are presented to verify our findings.