关于Mackey序列式回缩性

设(E,t)是局部凸空间诱导序列(E_n,t_n)_n∈N的诱导极限.则(E,t)=ind(E_n,t_n)为正则当且仅当对于(E,t)中每个Mackey收敛于o的序列(x_k)存在自然数n=n(x_k),使(x_k)含于且有界于(E_n,t_n).由此可获得关于正则性的一系列等价刻划.     

关于序列式回缩性的标记

设α（Ｅ,Ｅ）为介于弱拓扑σ（Ｅ,Ｅ）和Ｍａｃｋｅｙ拓扑τ（Ｅ,Ｅ）之间的Ｈｅｌｌｉｎｇｅｒ－Ｔｏｅｐｌｉｔｚ拓扑,称诱导极限（Ｅ,ｔ）＝ｉｎｄ（Ｅｎ,ｔｎ）的α－序列式回缩的,若（Ｅ,α（Ｅ,Ｅ）中每个收敛于０的序列必含于某Ｅｎ且为（Ｅ,α（Ｅｎ,Ｅｎ）中收敛于０的序列,我们证明了：α－序列式回缩性蕴涵正则性,特别地,我们证明了下述结论：若诱导极限（Ｅ,ｔ）＝ｉｎｄ（Ｅｎ,Ｔｎ）中每个收敛于０的     

弱序列式回缩性的一个特征

设(E,t)=ind(En,tn)为可尺度局部凸空间序列的Hausdorff诱导极限.我们证明了(E,t)为弱序列式回缩当且仅当(E,t)为正则且(E,t)满足下述条件:对于每个n,存在(En,tn)中的邻域Un及m=m(n)≥n使在Un中,(E,t)和(Em,tm)具有相同的弱收敛于0的序列.     

关于（M0）型（LF）——空间的注记

设(E,t)=ind(E_n),t_n)为(M.)型的(LF)—空间,则下述命题为等价: (1)(E,t)为正则; (2)(E,t)为α—正则; (3)(E,t)具一个由Frechet空间序列组成的定义谱(F_a,S_a)a∈N,使对于每个自然数n,(F_a,S_n)具一个ο—邻域基其成员都闭于(E,t); (4)(E,t)具一个由Frechet空间序列组成的定义谱(F_a,S_a)_a∈N,使对于每个自然数n,(F_a,S_a)具一个闭于(E,t)的ο—邻域; (5)(E,t)具一个由Frechet空间序列组成的定义谱(F_a,S_a)_a∈N,使对于每个自然数n及每个k≥n,(F_a,S_a)具一个ο—邻域基其成员都闭于(F_a,S_a); (6)(E,t)具一个由Frechet空间序列组成的定义谱(F_a,S_a)_a∈N,使对于每个自然数n及每个k≥n,(F_a,S_a)具一个闭于(F_h,S_h)的ο—邻域。     

关于Hellinger-Toeplitz拓扑的闭图定理

本文讨论的Hellinger-Toeplitz拓扑α对于任何对偶双(X,Y)有定义。一个可容拓扑α称为Hellinger-Toeplitz拓扑若对于任何两个对偶双(X_1,Y_1)、(X_2,Y_2),只要线性映照t:(X_1,σ(X_1,Y_1))→(X_2,σ(X_2,Y_2))为连续,必t:(X_1,α(X_1,Y_1))→(X_2,α(X_2,Y_2))也连续(见[1],11—1)。称Hellinger-Toeplitz拓扑α具有关于完备化的承继性,若对于任何对偶双(X,Y),(X,α(X,Y))的完备化(X,Y)恰为Y。相似地可定义α关于拟完备化和序列式完备化的承继性。     

T_1和T_(1(1/2))分离性之间的关系

先引述下列定义定义1 拓扑空间X称为T_1空间,若它的每个紧子集都是闭的。定义2 拓扑空间X称为T_(1(1/2))空间,若它的每个收敛序列的极限都是唯一的。     

关于有限维空间中的Schauder等价关系（英文）

设(x_n)是R^k中的一个序列.R^k上的Schauder等价关系E(R^k,(x_n))定义为:对任意a,b∈R^N,(a,b)∈E(R^k,(x_n))当且仅当■(a(n)-b(n))x_n收敛.对1≤t≤k,记cs⁽(t))是满足■a(mt+j)对每个j=0,1,…,t-1都收敛的a∈R^N的全体.证明了如果有无限多个n使(x_n)≠0,则存在t≤k使E(R^k,(x_n))～_BR^N/cs⁽(t)).     

关于0空间的一个注

设 L 同时是线性拓扑空间和半序线性空间,则 L 中有两种不同的收敛:拓扑收敛和序收敛。Ralph E.Demarr 称序收敛等价于拓扑收敛的半序线性拓扑空间为0空间,我们在中得到定理:设 L 同时是 Riesz 空间和完备线性拓扑空间,则 L 为 O 空间必有穷维。但在引理3的证明中,我们没有注意到 y_n(t)(?)C(S),所以实际上只在σ备的条件下得到定理2的证明。本文给出定理的-个新证明,作为文的改正。证:只须证明中引理3。设 C(S)为无穷维,则 S 为无穷集,由 S 的紧性知必有互不相同     

超顶点代数L_(c_m)的σ-正则性

设L_(c_m)是关于N=2超共形代数的超顶点代数,其中c_m=3m/m+2.2001年,Adamovic′证明了L_(c_m)的正则性.本文考虑超顶点代数L_(c_m)和自同构σ,证明了L_(c_m)的σ-正则性,这里σ|(L_(c_m))0=id且σ|(L_(cm))1=-id.     

不分明Tychonoff空间

设I=[0,1],它在数直线中的相对拓扑记为,我们称乘积诱导不分明拓扑空间(I,F_(θ×θ_I)为乘积诱导不分明单位区间,记为ω[0,1]。定义1 不分明拓扑空间(X,F)叫做不分明完全正则的,当且仅当对任一不分明开集A∈F和任一点P_(x_0)~α∈A,都有一个不分明连续映像T:(X,F)→ω[0,1],使得T(x_0)=0,T[X～～υ_α(A)]={1}。这里υ_α(A)=U{U:P_(x_0)~α∈N_U~βA},N_U~β是点P_(x_0)~α的邻域胚。不难看出,当α<1时,对任何A∈F都有υ_α(A)=σ_α(A),即A的强α—截割。定理1 若不分明拓扑空间(X,F)是不分明完全正则的,则它一定是拓扑生成的,也就     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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