首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到10条相似文献,搜索用时 15 毫秒
1.
Let S = {x1, x2,..., xn} be a set of distinct positive integers. The n x n matrix (S) whose i, j-entry is the greatest common divisor (xi, xj) of xi and xj is called the GCD matrix on S. A divisor d of x is said to be a unitary divisor of x if (d, x/d) = 1. The greatest common unitary divisor (GCUD) matrix (S**) is defined analogously. We show that if S is both GCD-closed and GCUD-closed, then det(S**) ≥ det(S), where the equality holds if and Only if (S**) = (S).  相似文献   

2.
A non-flat Riemannian space Vn is called Riemannian space with constant connection if its Christoffel symbols of the second kind are constant in some coordinate system {xi}. Following G. Vranceanu [3], a Riemannian space Vn with constant connection is said to be of genus p, if the components of the fundamental tensor in the coordinate system {xi/sup>} can be written in the form gij=cijata(a=1,…,p) where cija are constant, and p is least.In this paper we prove the following  相似文献   

3.
It has been shown in the present paper that the automorphism group of the group of upper triangular matrices (aij) with entries in the finite field Fq(q=pm,q>2, P is prime) and with α11=1 is solvable and complete.  相似文献   

4.
本文讨论Cauchy问题sub from i,j=0 to n aijuxixj+sub from i=0 to n biuxj+cu=0,x0>0,u(0,x1,…,xn)=ux0(0,x1,…,xn)=0的唯一性中的离散现象. 我们证明了,此问题在原点的一个邻域中只有平凡解的充要条件为b0(0)-sub from i=1 to n(2ai+1)λi≠0,其中λi>0是矩阵-(?2α00/?xi?xj(0))(i,j=1,…,n)与(aij(0))i,j=1,…,n)的乘积的特征根的平方根.αi是任意的非负整数.  相似文献   

5.
Let △={0=x01<…xn=1} be a partition of [0,1], and let hi=xi-xi-1(i=1,…,n) and △=(?)hi. The set of splines of degree 2 and deficiency 1 on △ is denoted by S2.  相似文献   

6.
The homogeneous Dirichlet problem(1) for quasilinear elliptic system in a bounded domain Ω is investigated in this paper. The existence of generalized solutions in [H01(Ω)]N is obtained by using the contructive Galerkin method. For the case of aijlm=0 when i≠j, it is estatablished that such generalized solutions have bounded [L(Ω)]N norm and possess Holeler continuity. Even in the particular case that fi are independent of Du, our results have improved those of A. V. Lair [Ann. Mat. Pura Appl., 116(1978)], allowing bi1(x,u) and fi(x,u) to have a growth in u arbitrarily close to 1.  相似文献   

7.
Let φ(x1,x2,…xm) be a real Borel measurable symmetrical function of the m variables, and let Un denote the U-statistic with kernel φ. In this note it is proved that the necessary and sufficient condition for E|φ|<+∞ is that there exists an n≥m such that E|Un|< + ∞.  相似文献   

8.
切于已知球的单形宽度   总被引:3,自引:1,他引:2  
Let w(△n) denote the width of a non-degenerate simplex △n in En and r(△n) denote the inradius of the simplex.Then, in this paper, we prove the ine-qunlity as below: Theorem:w(△n)≤βnr(△n) where βn =(n1/2(n+1))/([(n+1)/2]1/2(n+1-[(n+1)/2])1/2) The equality holds if and only if the simplex is regular.  相似文献   

9.
矩阵指数的偏迹不等式   总被引:1,自引:0,他引:1  
In this paper it is shown that if C is an n×n complex matrix and C(k) is the k-th compound of C, 1≤k≤n, N = (n k) and if the eigenvalues of C(k) are labeled inorder of decreasing magnitude |λ1(C(k))|≥λ2(C(k))|≥…≥λN(C(k))|define the partial trace tri(k)(C) by (?) Then for two n×n Hermrtian matrices A, B,with equality holds if A, B are commutative or k = n.  相似文献   

10.
Let U be an Γ-ring and M be an irreducible UΓ-moduie, for α∈U, α∈Γ, we define T[a,a]: M→M by m T[a,a] = maa for all m∈M. Let End(M) be the ring of all endomorphisms of the additive group of M. We define as usual End[Γ,U](M)=={ψ∈End(M)|TΣ[ai,ai]ψ=ψTΣ[ai,ai] all ai∈U,ai∈Γ}. In this paper the following results are obtained.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号