含有陡峭势阱和凹凸非线性项的Kirchhoff型问题的多重正解*

在这篇文章中, 作者研究涉及凹凸非线性项的Kirchhoff型问题-(a + b ∫R3|▽u|²dx) Δu + λV (x)u = μf(x)|u|^q?2u + |u|^p?2u, x ∈ R³,u ∈ H¹(R³),其中a,b > 0 是常数, λ, μ > 0 是参数, 1 < q < 2, 4 < p < 6 且 V 是一个非负连续位势. 在f(x) 和 V 的合适条件下,此问题正解的存在性和集中性能够通过Nehari 流形和Ekeland 变分原理得到.     

关于Diophantine 方程xn+2kyn=pz2

设p 为奇素数且对任意的整数m, d, p≠(2^m±1)=/d², 则对任意的素数n > p^8p2, 方程xⁿ+2^kyⁿ=pz², k≥2 没有整数解(x, y, z) 使得x, y, z 两两互素且均不为0.     

一类带临界指数的Kirchhoff型问题正基态解的存在性北大核心CSCD

研究了一类带临界指数的Kirchhoff型方程■其中Ω■R^(N)(N≥3)是一个具有光滑边界?Ω的有界区域,a,λ>0,b≥0,0相似文献   

Z[(-5)1/2]上不可分的Hermite型

本文讨论了Z[(-5)^1/2]上不可分的正定Hermite型的构作.给出了所有秩为2判别式等于2的不可分的正定Hermite型.当秩n≥3时,证明了存在Z[(-5)^1/2]上判别式等于2的不可分的正定Hermite型,并给出了它们的明显结构.     

关于P2(C)全纯曲线唯一性问题的注记*

本文讨论P²(C)中全纯曲线相交处于次一般位置超平面的唯一性.设f₁, f₂, · · · , f_λ为P²(C)中线性非退化的全纯曲线,H₁, H₁, · · · , H_q为P²(C)上处于m-次一般位置的超平面,满足A_j :f₁^-1(H_j) = · · · =f_λ^-1(H_j) (1 ≤ j ≤ q)且A_i ∩ A_j = ?(i = j).假设存在整数l (2 ≤ l ≤ λ),使得f_j1(z) ∧ f_j2(z) ∧ · · · ∧ f_jl(z) = 0 (z ∈ A_j)对任意l个指标1 ≤ j₁ < j₂ < · · · < j_l < λ成立.那么当 q > 2λ/λ-l+1 + 3/2 m时, f₁ ∧ · · · ∧ f_λ ≡ 0.关键技术是第二基本定理中不等式改进为: ∥(q - 3m/2)T_ft(r)≤ Pjq=1N²(f_t,H_j )(r, 0) + o(T_ft(r))(1 ≤ t ≤ λ).     

四阶非线性 Schrodinger 方程在L^p 初值空间中解的整体存在性研究*

本文考虑当初值u₀ ∈ L^p 时,四阶非线性Schr¨odinger方程的柯西问题的整体适定性. 在p /= 2的情形下,关于该柯西问题的解的存在性结论较少. 受已有二阶Schr¨odinger方程启发,借助一个关于L^p初值的分解引理和Strichartz估计,在 p > 2 且非线性项指数满足一定条件下, 本文得到了该四阶非线性Schr¨odinger方程的柯西问题的解的整体存在性.     

完备流形上拉普拉斯算子的L2特征形式

本文研究了完备非紧流行上拉普拉斯算子的L²特征形式.利用应力能量张量的方法,得到在此类流形上拉普拉斯算子的L²特征形式的一些不存在性定理。     

Local Well-posedness of the Derivative Schr¨odinger Equation in Higher Dimension for Any Large Data

In this paper, the authors consider the local well-posedness for the derivative Schr¨odinger equation in higher dimension u_t ? i△u + |u|²(?→γ · ?u) + u²(?→λ · ?u) = 0, (x, t) ∈ Rⁿ × R,?→γ ,?→λ ∈ Rⁿ; n ≥ 2.It is shown that the Cauchy problem of the derivative Schr¨odinger equation in higher dimension is locally well-posed in H^s(Rⁿ) (s > n/2) for any large initial data. Thus this result can compare with that in one dimension except for the endpoint space H^n/2.     

正则m叉树T的S(n)={Ki:1≤i≤n}-因子数的递归公式

在正则m叉树T中,删除K₂及端点关联边,通过所得子正则m叉树中分枝点、叶数和m之间内在联系,本文导出正则m叉树T的S⁽ⁿ⁾={K_i:1≤i≤n}-因子数递归公式.特别当m=2时,正则2叉树递归公式为:A_t=A_t/2²+2A_t/4² A_t/2,t为正则2叉树T的叶数.     

次线性半正边值问题的正解

本文讨论 Sturm-Liouville边值问题(p(t)u′)′+λf(t,u)=0, r＜t＜R;au(r)-bp(r)u′(r)=0;cu(R)+dp(R)u′(R)=0,正解的存在性,这里允许非线性项取负值．当f在u=+∞处一致次线性增长且无界时，必存在λ^*＞0，对?λ:λ＞λ^*,上述边值问题存在正解．     

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.     

Instructions for Authors

<正>Submission Authors must use LaTeX for typewriting,and visit our website www.actamath.com to submit your paper.Our address is Editorial Office of Acta Mathematica Sinica,Academy of Mathematics and Systems Science,Chinese Academy of Sciences,Beijing 100190,P.R.China.     

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

正August 10-14,2015Beijin,China The 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     

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.     

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     

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     

Bounds for the zeros of polynomials

Let P(z)=∑↓j=0↑n ajx^j be a polynomial of degree n. In this paper we prove a more general result which interalia improves upon the bounds of a class of polynomials. We also prove a result which includes some extensions and generalizations of Enestrǒm-Kakeya theorem.