共查询到20条相似文献,搜索用时 62 毫秒
1.
一个阶为n的图G称为是任意可分的(简作AP),如果对于任一正整数序列τ=(n1,n2,…,nk)满足n=n1+n2+…+nk,总是存在顶点集V(G)的一个划分(V1,V2,…,Vk)满足:对于i∈[1,k],|Vi|=ni,且子图G|Vi|是图G的Vi导出的一个连通子图.我们用S~*=S(n;m1,m2,…,mn)来表示最大度△(S~*)=3的太阳图.本文讨论了图S~*Pm(m≥3)的任意可分性. 相似文献
2.
图G的pebbling数f(G)是最小的整数n,使得不论n个pebble如何放置在G的顶点上,总可以通过一系列的pebbling移动把1个pebble移到任意一个顶点上,其中一个pebbling移动是从一个顶点处移走两个pebble而把其中的一个移到与其相邻的一个顶点上。Graham猜想对于任意的连通图G和H有f(G×H)f(G)f(H)。多扇图Fn1,n2,…,nm是指阶为n1+n2+…+nm+1的联图P1∨(Pn1∪Pn2∪…∪Pnm)。本文首先给出了多扇图的pebbling数,然后证明了多扇图Fn1,n2,…,nm具有2-pebbling性质,最后论述了对于一个多扇图和一个具有2-pebbling性质的图的乘积来说,Graham猜想是成立的。作为一个推论,当G和H都是多扇图时,Graham猜想成立。 相似文献
3.
设X,X1,X2,…为零均值、非退化、吸引域为正态吸引场的独立同分布随机变量序列.记Sn=n∑j=1Xj,Mn=maxk≤n|Sk|,V2n=n∑j=1X2j,n≥1.证明了当b>-1时,limε↗∞ε-2(b+1)∞∑n=1(loglogn)b/nlognP(Mn/Vn≤ε√π2/8loglogn)=4/πΓ(b+1)∞∑k=0(-1)k/(2k+1)2b+3. 相似文献
4.
ChaoHua Jia 《中国科学 数学(英文版)》2012,55(3):465-474
If n is a positive integer,let f (n) denote the number of positive integer solutions (n 1,n 2,n 3) of the Diophantine equation 4/n=1/n1 + 1/n2 + 1/n3.For the prime number p,f (p) can be split into f 1 (p) + f 2 (p),where f i (p) (i=1,2) counts those solutions with exactly i of denominators n 1,n 2,n 3 divisible by p.In this paper,we shall study the estimate for mean values ∑ p相似文献
5.
文[1 ] 对如下问题进行了研究 :已知实数x1 ,x2 ,… ,xn 满足x21 +x22 +… +x2 n= 1 ,当n≥ 3时 ,求maxi≠j mini≠j|xi-xj|.本文给出如下简捷解法 .由题意 ,不妨设x1 ≤x2 ≤…≤xn -1 ≤xn,并令mini≠j|xi-xj|=min|xi+ 1 -xi|=a(i=1 ,2 ,… ,n - 1 ) .则当 j>i时 ,xj-xi=(xj-xj-1 ) +… +(xi+ 1 -xi)≥(j-i)a∴ ∑1≤i相似文献
6.
研究了一类特殊循环环即循环准整环的构造,得到的主要结论有:1)所有的无限循环准整环就是M~0和 1)的标准分解式为n=p1α1p2α2…psαs,ⅰ)若s=1,则n阶循环准整环共有α1+1个,它们是dZ/ndZ,其中d=p1β1,0≤β1≤α1;ⅱ)若s>1,则n阶循环准整环共有α1α2…αs个,它们是dZ/ndZ,其中d=p1β1p2β2…psβs,... 相似文献
7.
In this paper,we investigate Sobolev mapping properties of the Bergman projection.The domain we focus on is defined by■ where m=(m1,...,mN) ∈(Z+)N,n=(N1,...,nN) ∈(Z+)N,N∈Z+.Sobolev irregularity of the Bergman projections on Ωn/m is shown.We also prove some Sobolev regularity results of the Bergman projections on Ωn/m for m=(1,...,1). 相似文献
8.
对x=(x1,x2,…,xn)∈R+n及r∈{1,2,…,n},定义了对称函数Fn(x,r)=Fn(x1,x2,…,xn;r)=∑1≤i12…r≤n(∏(j=1 xij/1+xij1/r,其中i1,i2,…,in是正整数.本文讨论了Fn(x,r)的Schur凸性、Schur几何凸性和Schur调和凸性,并借助于控制理论建立了若干不等式. 相似文献
9.
ZhangYi LuTongyu 《高校应用数学学报(英文版)》2004,19(4):429-434
Let (X1,X2,…,Xn) and (Y1,Y2,…Yn) be real random vectors with the same marginal distributions,if (X1,X2,…,Xn)≤c(Y1,Y2,…Yn), it is showed in this paper that ∑i=1^n Xi≤cx∑i=1^n Yi and max1≤k≤n∑i=1^k Xi≤icx max1≤k≤n∑i=1^k Yi hold. Based on this fact,a more general comparison theorem is obtained. 相似文献
10.
设Z,N分别是全体整数和正整数的集合,Mm(Z)表示Z上m阶方阵的集合.本文运用Fermat大定理的结果证明了:对于取定的次数n∈N,n≥3,二阶矩阵方程Xn+Yn=λnI(λ∈Z,λ≠0,X,Y∈M2(Z),且X有一个特征值为有理数)只有平凡解;利用本原素因子的结果得到二阶矩阵方程Xn+Yn=(±1)nI(n∈N,n≥3,X,Y∈M2(Z))有非平凡解当且仅当n=4或gcd(n,6)=1且给出了全部非平凡解;通过构造整数矩阵的方法,证明了下面的矩阵方程有无穷多组非平凡解:■n∈N,Xn+Yn=λnI(λ∈Z,λ≠0,X,Y∈Mn(Z));X3+Y3=λ3I(λ∈Z,λ≠0,m∈N,m≥2,X,Y∈Mm(Z)). 相似文献
11.
本文在LF拓扑空间中建立了L-fuzzy集网的弱收敛(R-收敛)概念,应用文[4]中的R-闭包,系统讨论了它们的性质,证明了等式RlimA_n=∧(∨A_m)_R和RlimA_n=A_n=∧(∨A_m)_R并且给出了L-fuzzy集网与其子网之间的关系。 相似文献
12.
Jogi Henna 《Annals of the Institute of Statistical Mathematics》2005,57(4):655-664
An estimator of the number of components of a finite mixture ofk-dimensional distributions is given on the basis of a one-dimensional independent random sample obtained by a transformation
of ak-dimensional independent random sample. A consistency of the estimator is shown. Some simulation results are given in a case
of finite mixtures of two-dimensional normal distributions. 相似文献
13.
N/Kbe a Galois extension of number fields with finite Galois group G.We describe a new approach for constructing invariants of the G-module structure of the K groups of the ring of integers of N in the Grothendieck group of finitely generated projective Z[G]modules. In various cases we can relate these classes, and their function field counterparts, to the root number class of Fröhlich and Cassou-Noguès. 相似文献
14.
Piotr Je¸drzejewicz 《代数通讯》2013,41(4):1500-1508
Let A be a UFD of characteristic p > 0, let 𝒵 be a set of some eigenvectors of a derivation of A. We prove, under some additional assumptions, a necessary and sufficient condition for 𝒵 to be a p-basis of the minimal ring of constants containing 𝒵. The main preparatory result is the unique decomposition theorem with respect to a factor from a given subalgebra containing Ap. 相似文献
15.
设P1,P2,……,Pt是几乎覆盖图G的l条不相交的路,s是没有被这些路覆盖的孤立点数.本证明:(i)匹配多项式μ(G,x)的非零根的重数最多是l,零根的重数最多l s。(ii)对于不含三角形的n阶图G,伴随多项式h(G,x)的非零根的重数最多是l,零根的重数最多是1/2(n l s).(iii)对一种含三角形的所谓A型图,(ii)也成立. 相似文献
16.
任意矩阵的特征值的扰动估计 总被引:1,自引:0,他引:1
设A和B是两个任意的n阶方阵,其特征值分别为{λ_1,…,λ_n}和{μ_1,…,μ_n}.本文对此两组特征值的如下“距离”的界给出了若干估计: B对于A的谱改变量 A与B的特征值的改变量这里的结果包含了Bauer-Fike定理,并且优于Kahan-Parlett/Jiang定理及Chu,施和肖所得出的结果. 相似文献
17.
有资格限制的指派问题的求解方法 总被引:3,自引:0,他引:3
在实际的指派工作中,常会遇到某个人有没有资格去承担某项工作的问题,因此,本建立了有资格限制的指派问题的数学模型。在此数学模型中,将效益矩阵转化为判定矩阵,由此给出了判定此种指派问题是否有解的方法;在有解的情况下,进一步将效益矩阵转化为求解矩阵,从而将有资格限制的指派问题化为传统的指派问题来求解。最后给出了一个数值例子来说明这样的处理方法是有效的。 相似文献
18.
We study the nilpotency of the sums of all coefficients of some sorts of products of polynomials over reversible, IFP, and NI rings, and introduce an SCN ring as a generalization. We characterize SCN rings in relation with related ring properties, and also provide several useful properties and ring extensions of SCN rings. 相似文献
19.
This note deals with the R-order of convergence of Weierstrass-Durand-Kerner-Dochev type single-step methods for the simultaneous determination of only a part of all roots of algebraic polynomials. 相似文献
20.
Rodney Y. Sharp 《Proceedings of the American Mathematical Society》2003,131(10):3009-3017
It is a well-known result of M. Brodmann that if is an ideal of a commutative Noetherian ring , then the set of associated primes of the -th power of is constant for all large . This paper is concerned with the following question: given a prime ideal of which is known to be in for all large integers , can one identify a term of the sequence beyond which will subsequently be an ever-present? This paper presents some results about convergence of sequences of sets of associated primes of graded components of finitely generated graded modules over a standard positively graded commutative Noetherian ring; those results are then applied to the above question.