Heisenberg群上Laplace算子的离散谱

本文证明了Heisenberg群上Laplace算子的Dirichlet特征值的存在性，给出了特征值的估计     

球面区域上buckling特征值的万有估计(英文)

本文研究了球面域上的buckling特征值问题.通过引入新的参数和使用Cauchy不等式,优化了Wang-Xia在文献[12]中的不等式.     

GRAPHS CHARACTERIZED BY LAPLACIAN EIGENVALUES

§1. Introduction Let G = (V,E) be a simple graph. The Laplacian matrix of G is L(G) = D(G)?A(G),where D(G) = diag (du,u ∈V (G)) (du is the degree of a vertex u) and A(G) are the degreediagonal and the adjacency matrices of G. The eigenvalues of L(G) are called the Laplacianeigenvalues and denoted by λ1(G) ≥λ2(G) ≥···≥λn(G) = 0or for short λ1 ≥λ2 ≥···≥λn = 0.The Laplacian matrix of a simple gra…     

UNIVERSAL BOUNDS FOR EIGENVALUES OF LAPLACIAN OPERATOR OF ANY ORDER

Let Ω be a connected bounded domain in Rn. Denote by λi the i-th eigenvalue of the Laplacian operator with any order p:{0(-△)pu =λu u =■u/→■n =···=■→■np-1 p-u1=0 in Ω,on ■Ω.In this article, we give some expressions for upper bound of the (k + 1)-th eigenvalue λk+1 in terms of the first k eigenvalues.     

图的Laplacian特征值

本文研究了连通图的Laplacian特征值,利用图的Laplacian矩阵的特征多项式的行列式表示式,对存在两个不同顶点,但有相同邻集的一类图,得到了一个Laplacian特征值,并给出了它的应用.     

UNIVERSAL INEQUALITIES FOR A HORIZONTAL LAPLACIAN VERSION OF THE CLAMPED PLATE PROBLEM ON CARNOT GROUP

In this paper, we investigate a horizontal Laplacian version of the clamped plate problem on Carnot groups and obtain some universal inequalities. Furthermore, for the lower order eigenvalues of this eigenvalue problem on carnot groups, we also give some universal inequalities.     

单圈图的Laplace矩阵的最大特征值

利用阶数给出了单圈图的Laplace矩阵的最大特征值的第一,第二,第三,第四大值及最小值,并刻划达到上,下界的极图。     

A NEW LAPLACIAN COMPARISON THEOREM AND THE ESTIMATE OF EIGENVALUES

This paper establishes a new Laplacian comparison theorem which is specially useful to the manifolds of nonpositive curvature.It leads naturally to the corresponding heat kernel comparison and eigenvalue comparison theorems. Furthermore, a lower estimate of L^2-spectrum of an n-dimensional non-compact complete Cartan-Hadamard manifold is given by (n-1)k/4,provided its Ricci curvature ≤-(n-1)k(k=const.≥0).     

A NEW LAPLACIAN COMPRISON THEOREM AND THE ESTIMATE OF EIGENVALUES

Ａ ＮＥＷ ＬＡＰＬＡＣＩＡＮ ＣＯＭＰＲＩＳＯＮ ＴＨＥＯＲＥＭ ＡＮＤ ＴＨＥ ＥＳＴＩＭＡＴＥ ＯＦ ＥＩＧＥＮＶＡＬＵＥＳ ￥ＤＩＮＧＱＩＮＧＡｂｓｔｒａｃｔ：ＴｈｉｓｐａｐｅｒｅｓｔａｂｌｉｓｈｅｓａｎｅｗＬａｐｌａｃｉａｎｃｏｍｐａｒｉｓ...     

Riemann流形上Laplace算子第一特征值的一点注记

本文研究了黎曼流形上Laplace算子的第一特征值,利用流形的测地球上的Sobolev常数进行讨论并进行Moser迭代,得到闭的黎曼流形上Laplace算子第一特征值的一个下界估计.     

SEMILINEAR DEGENERATE HEAT INEQUALITIES WITH SINGULAR POTENTIAL ON THE HEISENBERG GROUP

This article deals with the global existence and nonexistence of solutions to the degenerate heat inequalities with singular potential on the Heisenberg group. To prove the existence results, the authors adjust the method of supersolutions to their setting. The nonexistence results are obtained by means of the test function method.     

极小超曲面上Laplace算子的谱

本文证明了单位球面Ｓ＾ｎ＋１中某些Ｃｌｉｆｆｏｒｄ超曲面，复射影空间和四元数射影空间中广ＹＱ ＬＩＦＦＯＲＤＦＨＶ ＭＡ ＤＭ Ｊ ＭＨ ＡＤＷ Ｈ Ｌａｐｌａｃｅ算子的谱唯一确定。     

ESTIMATES ON EIGENVALUES FOR THE BIHARMONIC OPERATOR ON A BOUNDED DOMAIN IN H~n(-1)

In this paper, we consider eigenvalues of the Dirichlet biharmonic operator on a bounded domain in a hyperbolic space. We obtain universal bounds on the (k + 1)th eigenvalue in terms of the first kth eigenvalues independent of the domains.     

球面域上高阶拉普拉斯的特征值估计

本文研究了球面域上高阶拉普拉斯的特征值问题. 利用Rayleigh-Ritz不等式, 获得了球面域上高阶拉普拉斯的第(k+1)个特征值的上界估计, 这个估计式由前k个特征值给出.     

Heisenberg型群上的几类Hardy型不等式

文章得到了Heisenberg型群上的几类Hardy型不等式,并确定出了次Laplace算子的Hardy型不等式中的最佳常数．     

一类Hermitian鞍点矩阵的特征值估计

本文研究了一类大型稀疏Hermitian鞍点线性系统Az=(B E E* 0)(x y)=(f g)=b系数矩阵的特征值,其中B∈C~(p×p)是Hermitian正定阵矩阵,E∈C~(p×q)是列降秩.本文分别给出了该系数矩阵正特征值与负特征值界的一个估计式,同时通过数值算例验证本文所给出的特征值界的估计是合理且有效的.     

曲面上图的拉普拉斯谱半径

本文研究了图嵌入到给定紧致曲面上的拉普拉斯谱半径,确定了将顶点数为n、最大度为△的图分别嵌入到亏格为g的定向曲面和亏格为h的不可定向曲面上的新上界.     

TOEPLITZ OPERATORS ON HEISENBERG GROUP

Denote by Ω the Siegel domain in Cn, n 〉 1. In this paper, we study the essential spectra of Toeplitz operators defined on the Hardy space H2（а↓Ω）. In addition, the characteristic equation of analytic Toeplitz operators iааs obtained.     

SOME LIOUVILLE TYPE THEOREMS FOR THE P-SUB-LAPLACIAN ON THE GROUP OF HEISENBERG TYPE

In this paper we prove some Liouville type results for the p-sub-Laplacian on the group of Heisenberg type. A strong maximum principle and a Hopf type principle concerning p-sub-Laplacian are established.