一个隐函数定理

本文将[1]中定理1(或[2]中定理3.1)推广成本文定理1,将此定理应用于反函数,则得到一映射是同胚或局部同胚的充要条件。     

一类具有逐点Lipschitz跟踪性的动力系统

通过引进逐点Lipschitz跟踪性的概念,证明了f具有逐点Lipschitz跟踪性当且仅当对任意正整数k,fk均具有逐点Lipschitz跟踪性;f1×f2×...×fn具有逐点Lipschitz跟踪性当且仅当fi,i=1,2,...,n均具有逐点Lipschitz跟踪性.证明了系统(X,f)的逐点Lipschitz跟踪性与其提升系统(X～,f～)的逐点Lipschitz跟踪性的相互蕴涵性.若f是同胚,则f具有逐点Lipschitz跟踪性当且仅当其逆极限空间上的移位映射σf具有逐点Lipschitz跟踪性.     

拓扑空间上的双半连续映射

本文引进了双半连续映射的概念,并讨论了它的一些性质及其与同胚映射、半同胚映射的关系。     

同胚定理和非线性时变系统的周期解

本文给出了一类非线性Fredholm算子是同胚映射的充要条件,并用它证明了非线性时变系统的周期解的存在唯一性。     

Fuzzifying连续映射的等价刻画

给出L－fuzzifying连续映射的若干等价刻画，运用集合套的方法，证明了：一映射为L－fuzzifying连续映射的充要条件是它在每个截集拓扑空间中是连续的。     

关于紧度量空间之间同胚映射可扩性的一个注记

映射φ：X→Y称为覆盖映射，如果φ是k到1的开的局部同胚映射，证明了定理“对于紧度量空间之间的同胚映射f：X→X及F：Y→Y，如果存在覆盖映射φ：X→Y，使得gφ=φf，则f可扩蕴含g可扩”中的映射φ所含条件“k到1”可以省略。     

关于不定映射的几个性质

文〔１〕给出了半同胚定理,指出不定映射及准半映射与半同胚映射的密切关系。本文给出关于不定映射的几个较为有用的结果,无疑有益于讨论半同胚映射。同时,本文中的定理４在某种意义上给出文〔２〕中定理６的逆命题成立的条件。     

半分离空间的映射性质

将分离公理推广为半分离公理，讨论了半分离空间在同胚映射、强半开映射、弱半开映射、半开映射和弱连续映射下的有关性质。     

广义映射与广义半同胚映射

在一般拓扑空间中引入了广义不定映射、广义准半开映射、广义准半闭映射和广义半同胚映射的概念,给出了这些映射的基本性质及它们之间的关系,并建立了广义半同胚定理．     

无周期点的图映射的逆极限空间

设Ｇ为有限图，ｆ：Ｇ→Ｇ为周期点集为空集的逐段单调的连续映射．本文证明了逆极限空间（Ｇ，ｆ）同胚于圆周，从而知，其上任一自同胚具有零拓扑熵．     

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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