关于有界对称域上的混合范数空间

本文研究了Ｃｎ中有界对称域Ω上的混合范数空间Ｈ（ｐ，ｑ，　）其中０＜ ｐ＜　，０＜ｑ＜　，　是正规函数，给出了Ω上全纯函数ｆ的分数导数ｆ［β］和 分数积分ｆ［β］属于（ｐ，ｑ，）的等价条件。应用这些结果，就两种情形０＜ｐ≤２， ０＜ｑ＜　和２≤ｐ＜，０＜ｑ＜ ，用全纯函数ｆ的展式中的系数，分别给出了 ｆ　Ｈ（ｐ，ｑ，）的必要条件和充分条件，并证明了多调和函数ｕ组成的混合范数空 间ｈ（ｐ，ｑ，）（０＜ｐ，ｑ＜　）是自共轭的．     

非负Ricci曲率Riemann流形上的Sobolev不等式及Sobolev嵌入定理

设Ｍ是具有非负Ｒｉｃｃｉ曲率的完备Ｒｉｅｍａｎｎ流形，本文证明Ｍ上Ｓｏｂｏｌｅｖ不等式‖ｆ‖ｑ≤Ｃｎ，ｐ，ｑ（１≤Ｐ，ｑ＜∞）对一切（Ｍ）成立的充要条件是对一切ｘ∈Ｍ，Ｖｘ（ｒ）＝Ｖｏｌ（Ｂｘ（ｒ））≥且，而Ｍ上较弱的Ｓｏｂｏｌｅｖ不等式‖ｆ‖ｑ≤Ｃｎ‖Ｆ‖ｐ）（１＜ｐ＜ｑ＜∞）对一切ｆ∈Ｈ（Ｍ）成立的充要条件是，且最后，证明了Ｍ上ｓｏｂｏｌｅｖ嵌入定理，如果，则；如果则成立．     

改进的R.Nevanlinna第二基本定理

设ｆ（ｚ）是超越亚纯函数，ｎ为任一非负整数，ε为任意正数，ａ＾（ｉ）ｒ＝（ｖ＝１，２，…，ｑｉ，ｉ＝０，１，…，ｎ）均为有穷非零复数，满足ｍｉｎ／１≤ｖ１＜ｖ２≤ｑｉ｜ａ＾（ｉ）ｖ１－ａ＾（ｉ）ｖ２｜≥δ＞０，ｉ＝０，１，…，ｎ。若ｆ（０）≠０，∞，П＾ｎｉ＝１ｆ（ｉ）（０）≠０，则对０＜ｒ＜＋∞有ｍ（ｒ，ｆ）＋ｍ（ｒ，１／ｆ）＋Σ＾ｕｉ＝０Σ＾ｑｉｒ＝１ｍ（ｒ，ａ＾（ｉ）ｖ，ｆ＾（ｉ）≤（２＋ε     

Opial－Olech型不等式的改进及其应用

本文给出：设ｆ（ｘ）在［０，ｈ］上绝对连续。ｆ（０）＝ｆ（ｈ）＝０，ｐ＞０，ｑ＞１和ｓ＝Ｐ／（ｐ＋ｑ－１），则有 其中θ（ｐ）＝1/2,p+q>0,θ（ｐ）＝P/2.当１＜ｐ＋ｑ＜２.若代（Ａ）右边为零。即为Ｏｐｉａｌ－Ｏｌｃｃｈ不等式。实际上本文所得结果还要广泛。     

任意维数的强阻尼非线性波动方程（Ⅰ）—初边值问题

本文研究任意维数的强阻非线性波动方程ｕｔｔ－ａΔｕｔ－Δｕ＝ｆ（ｕ）具第一类齐边界条件的初值问题，设ｆ∈Ｃ＾１，ｆ＾１（ｕ）上方有界，且当ｎ≥４时存在常数Ａ，Ｂ和ｐ，使｜ｆ＾１（ｕ）｜≤Ａ｜ｕ｜＾ｐ＋Ｂ，其中０＜ｐ≤４／（ｎ－４）（ｎ＞４）：０＜ｐ＜∞（ｎ＝４），得到唯一整体强解，从而改进和推广了已知结果。     

Hardy型空间HA_0~（p，q，s）（R~n）及其应用

０＜ｐ≤１＜ｑ≤２，非负整数．本文通过定义一类特殊的中心（ｐ，ｑ，ｓ）－原子，引进了一类新的Ｈａｒｄｙ型空间Ｈ０（ｐ，ｑ，ｓ）（Ｒｎ）．并且建立了它的广义Ｌｕｓｉｎ面积特征．利用这个特征，还给出了一个内插定理，并且建立了一类乘子的有界性．     

一类函数最值的数形结合解法

本文用数形结合的方法,求解形如：ｆ（ｘ）＝ｍ＋ｎｘ－ｘ２－ｐ＋ｑｘ－ｘ２（ｎ２＋４ｍ＞０,ｑ２＋４ｐ＞０）的函数的最值,此函数的定义域非空．设方程ｍ＋ｎｘ－ｘ２＝０的两根为ａ、ｂ,且ａ＜ｂ;设ｐ＋ｑｘ－ｘ２＝０的两根为ｃ、ｄ,且ｃ＜ｄ．则ａ＝ｎ－ｎ２...     

关于圆内亚纯函数幅角分布的一个结果

本文得到如下结果：若ｆ（ｚ）为｜ｚ｜＜１内ρ（０＜ρ＜∞）级亚纯函数，则存在点ｅ＾ｉ∞（０≤θ＜２π），使得对于任意ε＞０，任意正整数Ｋ以及｜ｚ｜＜１内任意两个级小于ρ的亚纯函数ａ（ｚ），ｂ（ｚ）     

1997年高考24题的深刻背景

文［１］介绍了１９９７年高考（理科）２４题的命题思想，其最初形式为给定二次多项式ｆ（ｘ）＝ａｘ２＋ｂｘ＋ｃ，ａ＞０，设０＜ｘ１＜ｘ２＜１ａ，满足ｆ（ｘｉ）＝ｘｉ，ｉ＝１，２，证明：当０＜ｘ＜ｘ１时，（１）ｘ＜ｆ（ｘ）＜ｘ１；（２）存在０＜ｑ＜１，使得...     

消失Bergman—Carleson测度和小Bloch空间的特征

本文给出了消失Ｂｅｒｇｍａｎ－Ｃａｒｌｅｓｏｎ测度的一个特征，证明了：当ｆ∈Ｈ（Ｂ），０＜ｐ＜∞时，ｆ∈Ｂ０等价于ｌｉｍ｜ｚ｜→１｜Δｆ（ｚ）｜＝０，等价于ｌｉｍ｜ａ｜→１∫Ｂ｜Δｆ（ｚ）｜ｐＪＲφａ（ｚ）ｄｖ（ｚ）＝０，等价于Δｆ（ｚ）｜ｐｄｖ（ｚ）是消失Ｂｅｒｇｍａｎ－Ｃａｒｌｅｓｏｎ测度．     

RECENT PROGRESS ON SPHERICAL HARMONIC APPROXIMATION MADE BY BNU RESEARCH GROUP ——In memory of Professor Sun Yongsheng

As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his guidance and encouragement his students started the research on spherical harmonic analysis and approximation. In this paper, we incompletely introduce the main achievements in this area obtained by our group and relative researchers during recent 5 years （2001-2005）. The main topics are： convergence of Cesaro summability, a.e. and strong summability of Fourier-Laplace series; smoothness and K-functionals; Kolmogorov and linear widths.     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

Boundedness for commutators of multipliers on Hardy type spaces

In this paper, we study the commutators generalized by multipliers and a BMO function. Under some assumptions, we establish its boundedness properties from certain atomic Hardy space Hb^p（R^n） into the Lebesgue space L^p with p 〈 1.     

A unified approach to certain problems of best local approximation

In this paper we study best local quasi-rational approximation and best local approximation from finite dimensional subspaces of vectorial functions of several variables. Our approach extends and unifies several problems concerning best local multi-point approximation in different norms.     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

<正>August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists     

Towards Excellence in Science Chinese Academy of Sciences

<正>May 26,2014,Beijing Science is a human enterprise in the pursuit of knowledge.The scientific revolution that occurred in the 17th Century initiated the advances of modern science.The scientific knowledge system created by