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1.
运用数论和图论技巧,得到了当λ(D)3时本原有向图D的广义指数exp(D,k)的界,这里λ(D)表示D中不同长的圈的类数,还证明了对任何整数n,t,不存在n阶本原有向图D,使得n2-tn+14(t+1)2+k-2<exp(D,k)<n2-(t-1)n+t+k-3.  相似文献   

2.
本文考虑了欧式空间R ̄n中任意单纯形剖分上的样条函数空间.证明了当k≥(3μ+1)2 ̄(n-2)+1时,计算任意单纯形剖分Δ上的k次μ阶光滑样条空间的维数,可归结为计算每个σ-关联域(i-单纯形σ∈Δ)R(σ)上的2 ̄(n-i-1)μ次μ阶光滑(i≤n-1)样条空间的维数。这里σ-关联域R(σ)是指Δ中所有包含σ的单纯形所成的单纯形剖分.  相似文献   

3.
本文给出并证明了Ramsey数r(k,l)的一个新下界公式r(k,l)≥1.5(k-1)(l-1),此下界公式与文献[1,2]所给出的下界公式r(k,l)>(n2^n/2)/(e√2,n=min(k,l)相比,当k,l较小时,或k,l相差较大明要优越。  相似文献   

4.
矩阵方程AXB=C的通解   总被引:4,自引:0,他引:4  
本文给出了矩阵方程 A_(m×n)X_(n×5)B_(s×)=C_(m×t)有解且有无穷解的通解表达式 X=C~(**)+[k_(11)ξ_1~T+…+k_(1(n-r))ξ_(n-r)~T+……k_(s1)ξ_1~T+…+k_(s(n-r))ξ_(n-r)~T] +[P_(11)η_1+…+P_(1(s-1))η_(s-1)……P_(n1)η_1+…P_(n(s-1))η_(s-1)]~T(其中k_(ij);P_(ij)为任意常数;ξ_1…,ξ_(n-r);η_1…,η_(s-1)分别为A_(m×n)X_(n×1)=0;X_(1×s)B_(s×t)=0的一个基础解系,C~(**)为AXB=C的一个特解)及利用矩阵初等变换求其通解的方法.  相似文献   

5.
袁平之 《数学学报》1998,41(3):525-530
设d无平方因子,h(d)是二次域Q(d)的类数,本文证明了:若1+4k2n=da2,a,k>1,n>2为正整数,且a<0.9k35n或n的奇素因子p和k的素因子q均适合(p,q-1)=1,则除(a,d,k,n)=(5,41,2,4)以外,h(d)≡0(modn).同时,我们猜测:上述结果中的条件(p,q-1)=1是不必要的.  相似文献   

6.
对称本原有向图的广义本原指数集   总被引:3,自引:0,他引:3  
本文证明了全体n阶对称本原有向图的第k个第一类(1≤k<n-1)、第二类(1≤k≤n-1)和第三类(2≤k≤n-1)广义本原指数的指数集分别是{1,2,…,n-2+k}和{1,2,…,2(n-k)},其中「a]表不小于a的最小整数,[b]表不大于b的最大整数。  相似文献   

7.
设G(z)在|z|<ρ(ρ>1)中解析,且数据Re[G(ej2kπ/n)];k=0,1,…,n-1已给出,其中n=2ν+1,本文构造了一个ν次多项式Pν(z)满足插值条件Re[Pν(ej2kπ/n)]=Re[G(ej2kπ/n)],k=0,1,…,n-1.并估计了误差‖G(ejω)-Pν(ejω)‖.此外,还给出了一个Walsh类型的超收敛定理.  相似文献   

8.
本文研究两参数d维Ornstein-Uhlenbeck过程的相交局部时的联合连续性,k重点的存在性.当4k>(k-1)d时,得到了OUP2.d的k重时集的Hausdorff维数与packing维数.  相似文献   

9.
关于虚二次域类数的可除性   总被引:2,自引:0,他引:2  
曹珍富 《数学学报》1994,37(1):50-56
设α>1,b>1,(α,b)=1,h(-αb)表虚二次域的类数。如果有正整数x,y,n,k满足(1)αx ̄2+by ̄2=4k ̄n,b且;或(2)αx ̄2+by ̄2=k ̄n,x|α,y|b且αb≡2(mod4),则本文证明了关于h(-αb)的可除性的两个定理(见定理1,2),其中符号x|α表示x的每一个素因子整除α。  相似文献   

10.
记δn=Σ↓k≤n(^kn-k),在本文中证明了:A↓r∈N,若A↓∈N,若A↓∈{1,2,…,r},qi(〉5)都是素数,并且[(δqi-1-1)!+1]/δqi-1是正整数,则图簇Kn-E(k0P3∪k1Pq1-1∪…∪krPqr-1)是色唯一的,推广了文[1]的结果。  相似文献   

11.
Let {X n } n0 be a Harris recurrent Markov chain with state space E, transition probability P(x, A) and invariant measure , and let f be a real measurable function on E. We prove that with probability one,
under some best possible conditions.  相似文献   

12.
P(n,k)的计数及其良域   总被引:9,自引:1,他引:8       下载免费PDF全文
设P(n,k)为整数n分为k部的无序分拆的个数,每个分部≥1;P(n)为n的全分拆的个数.P(n,k)是用途广泛的、且又十分难予计算的数.本文证明了下述定理:当n<k,P(n,k)=0;当k≤n≤2k,P(n,k)=P(n-k);当k=1,4≤n≤5,或者当k≥2,2k+1≤n≤3k+2,P(n,k)=P(n-k)-(?)P(t)还定义了P(n,k)的良城,因面可借助若干个P(n)的值,迅速地计算大量的P(n,k)的值.  相似文献   

13.
In this paper, we discuss the moving-average process Xk = ∑i=-∞ ^∞ ai+kεi, where {εi;-∞ 〈 i 〈 ∞} is a doubly infinite sequence of identically distributed ψ-mixing or negatively associated random variables with mean zeros and finite variances, {ai;-∞ 〈 i 〈 -∞) is an absolutely solutely summable sequence of real numbers.  相似文献   

14.
Let {Xn,n ≥ 0} be an AR(1) process. Let Q(n) be the rescaled range statistic, or the R/S statistic for {Xn} which is given by (max1≤k≤n(∑j=1^k(Xj - ^-Xn)) - min 1≤k≤n(∑j=1^k( Xj - ^Xn ))) /(n ^-1∑j=1^n(Xj -^-Xn)^2)^1/2 where ^-Xn = n^-1 ∑j=1^nXj. In this paper we show a law of iterated logarithm for rescaled range statistics Q(n) for AR(1) model.  相似文献   

15.
Letn>1. The number of all strictly increasing selfmappings of a 2n-element crown is . The number of all order-preserving selfmappings of a 2n-element crown is
  相似文献   

16.
First we show that the Carl-Maurey inequality for entropy numbers
  相似文献   

17.
We study the behavior of functionals of the form
$ \mathop {\sup }\limits_{l > n} \left( {l - n} \right){\left( {\sum\limits_{k = 1}^l {\frac{1}{{{\psi^r}(k)}}} } \right)^{{{ - 1} \mathord{\left/{\vphantom {{ - 1} r}} \right.} r}}}, $ \mathop {\sup }\limits_{l > n} \left( {l - n} \right){\left( {\sum\limits_{k = 1}^l {\frac{1}{{{\psi^r}(k)}}} } \right)^{{{ - 1} \mathord{\left/{\vphantom {{ - 1} r}} \right.} r}}},  相似文献   

18.
Let Si be a random walk with standard exponential increments. The sum ∑ i=1 k Si is called the k-step area of the walk. The random variable ∑ i=1 k Si plays an important role in the study of the so-called one-dimensional sticky particles model. We find the distribution of this variable and prove that
for 0 ≤ t ≤ 1. We also show that
, where the Ui,n are order statistics of n i.i.d. random variables uniformly distributed on [0, 1]. Bibliography: 6 titles. __________ Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 341, 2007, pp. 48–67.  相似文献   

19.
Newton's binomial theorem is extended to an interesting noncommutative setting as follows: If, in a ring,ba=ab with commuting witha andb, then the (generalized) binomial coefficient arising in the expansion
  相似文献   

20.
Equations with two time scales (refinement equations or dilation equations) are central to wavelet theory. Several applications also include an inhomogeneous forcing term F(t). We develop here a part of the existence theory for the inhomogeneous refinement equation
where a (k) is a finite sequence and F is a compactly supported distribution on ℝ. The existence of compactly supported distributional solutions to an inhomogeneous refinement equation is characterized in terms of conditions on the pair (a, F). To have Lp solutions from F ∈ Lp(ℝ), we construct by the cascade algorithm a sequence of functions φ0 ∈ Lp(ℝ) from a compactly supported initial function ℝ as
A necessary and sufficient condition for the sequence {φn} to converge in Lp(ℝ)(1 ≤ p ≤ ∞) is given by the p-norm joint spectral radius of two matrices derived from the mask a. A convexity property of the p-norm joint spectral radius (1 ≤ p ≤ ∞) is presented. Finally, the general theory is applied to some examples and multiple refinable functions. Acknowledgements and Notes. Research supported in part by Research Grants Council and City University of Hong Kong under Grants #9040281, 9030562, 7000741.  相似文献   

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