变叙的项的联合分布的极限

§1.引言让X表分布律为F(x)的一随机变量。按其大小编排X的n个独立试验结果,便得到所谓变叙:比值k/n叫作变叙的项(?)_k的秩。如果n→∞时,k/n的极限存在且等于λ(0≤λ≤1),我们称λ为极限秩,当λ等于0或1时,项(?)_k称作边项,否则称作中间项。关于项(?)_k(1≤k≤n)的分布的极限问题以及两个项(?)_(k1),(?)_(k2)(1≤k_1相似文献   

点可迁图的限制边连通度

对于度k( ≥ 2 )的点可迁连通图的限制边连通度λ′,已知k≤λ′≤ 2k- 2 ,且λ′的界可以达到 .在此基础上 ,对度为k的点可迁图G进一步给出了满足λ′(G) =k的两个充要条件 .接着 ,对任意的连通图G0 证明了λ′(K2 ×G0 ) =min{2δ (G0 ) ,2λ′(G0 ) ,v(G0 ) }.最后证明了对任意满足 0≤s≤k- 3的整数s,存在度为k的点可迁连通图G满足λ′(G)=k s当且仅当k为奇数或者s为偶数     

路的k阶幂图的连通性研究

设G是连通图,G的k阶幂图G^k是一个与G具有相同顶点集的图,G^k中的两个顶点相邻当且仅当这两个顶点在G中的距离不大于k.本文研究了路的幂图P_n^k的点连通度κ(P_n^k)、边连通度λ(P_n^k)和限制边连通度λ₂(P_n^k).得到：当n>k时,κ(P_n^k)=λ(P_n^k)=k;关于限制边连通度：当2≤n≤k+1时λ₂(P_n^k)=2n-4,当n>k+1时,λ₂(P_n^k)=2k-1.     

"关于空间K—Q.C.的复盖问题"一文的注记

本文在文献[1]的基础上,采用分析的方法,将文[1]中的定理1和定理3作了较大的改进,把这两个定理中的复盖程度的下界估值分别提高为λ_n~((1-k)/k)和λ_n~((1-K)/K).此处,λ~(1/n)≤λ_N=const≤λ,λ~(1/n)≤λ_N=const≤λ.     

循环序列相关系数的联合分布

关于循环序列相关系数的分布问题,前人迄今为止已得到了γ_k及q_k的精确分布。本文导出了q_o,…,q_m中任K(1≤k≤m)个的精确联合分布密度。     

关于图谱的几个定理

本文给出了边独立数为q的树(或森林)的第k大正特征值的下界,并且证明这个下界在很多情况下是最好可能的;又给出了一种使得具有完美对集的树最小正特征值递减的变形,从而为一个关于最小正特征值的Sharp下界的猜想给出了一种更有应用前景的新证明.     

一类完全三部图K(m,n,r)的色唯一性的判定

设G是简单图,用P(G,λ)表示图G的色多项式,若对任意简单图H使P(H,λ)=P(G,λ),都有H与G同构,则称G是色唯一图。令K(m,n,r)表示完全三部图,证明了(1)设m≤n≤r,0≤r-m≤4,若m≥2,则除去K(2,2,6)、K(2,3,6)、K(3,3,7)、K(3,4,7)外,K(m,n,r)是色唯一图。(2)若n≥4,0≤k≤2,则K(n-k,n,n k)是色唯一图。     

关于完全3部图的色唯一性

文章设P(G,λ)是图G的色多项式,若对于任意与图G的色多项式相等(P(G,λ)=P(H,λ))的图H都与图G同构(G≌H),则称图G是色唯一图;通过比较3部图的4色类的划分数证明,如果4≤v+2≤k≤2v,n>(k-1)2/4,则完全3部图K(n,n+v,n+k)是色唯一图。     

正则度为5,6,7时的强正则图的完全确定

设G是一个具有参数（n,k,λ,μ）的强正则图,首先讨论了图G的一些性质以及参数n,k,λ和μ之间的关系,特别地,提出了一个关于参数n,k,λ和μ的整性条件.利用这些性质,完全确定了正则度k=5,6,7时的所有强正则图.     

关于色多项式一次系数与简单图特征的若干结论

利用Whitnoy的著名结果 :P(G ,λ) = n - 1i =1 (- 1) ibiλn -i给出并证明了 :①G为连通偶图 ,当bn -1为奇数 ;②G为树 ,当bn -1=1;③分支数为k的图是偶图 ,当bn -k是奇数且bi=0 (n -k +1≤i≤n - 1)等八个定理     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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