Buckley定理的推广

文章获得如下结果：设Ｎ是有限可解群Ｇ的正规子群，如果Ｇ／Ｎ为超可解群，且Ｆｉｔ（Ｎ）的每一极小子群以及每一阶为４的循环子群在Ｇ中正规，则Ｇ为超可解群     

几个超可解性定理的推广

设Ｎ是有限可解群Ｇ的正规子群,使得Ｇ／Ｎ超可解,若Ｆ（Ｎ）的极小子群在Ｇ中Ｃ－正规,且以下条件之一被满足,则Ｇ超可解：（１）Ｆ（Ｎ）的４阶循环子群在Ｇ中Ｃ－正规;（２）Ｇ中不含Ｄ２ｑ型子群。     

一类Bp群及其应用

群Ｇ称为Ｂ＿ｐ群，如果Ｎ＿ｇ（Ｐ）为ｐ－幂零蕴含Ｇ为Ｐ－幂零。证明了以下结论：１）设Ｐ为有限群Ｇ的ｐ－Ｓｙｌｏｗ子群，如果Ｐ的每极小子群及４阶循环子群在Ｐ内拟正规，则Ｇ为Ｂ＿ｐ群２）设Ｐ为有限群Ｇ的Ｐ－Ｓｙｌｏｗ子群。如果Ｐ的极小子群及４阶循环子群在Ｎ＿Ｇ（Ｐ）内拟正规，且其每元与Ｎ＿Ｇ（Ｐ）的每ｑ－元（ｑ＜ｐ）可交换相乘，则Ｇ为Ｐ－幂零。３）有限群Ｇ若有正规子群Ｎ，使Ｇ／Ｎ∈，又对每Ｐ∈Ｓｙｌ（Ｎ）．均有Ｐ的极小于群及４阶循环子群在Ｎ＿Ｇ（Ｐ）内拟正规，则Ｇ∈。其中为包含超可解群系的饱和群系。     

关于饱和群系的一点注记

定义 1[1] 　有限群类Ｆ称为一个群系 ,若下列条件成立 :(1)如果Ｇ∈Ｆ ,Ｎ△Ｇ ,则Ｇ/Ｎ∈Ｆ ;(2 )如果Ｎ1,Ｎ2 △Ｇ ,使得Ｇ/Ｎ1,Ｇ/Ｎ2 ∈Ｆ ,则Ｇ/Ｎ1∩Ｎ2 ∈Ｆ。由定义知 ,群系对直积是封闭的。引理 1　设Ｇ =Ｈ×Ｋ ,Ｈ ,Ｋ∈Ｆ ,则Ｇ∈Ｆ。定义 2　非空群系Ｆ称为饱和的 ,若由Ｇ/Φ(Ｇ)∈Ｆ ,便可得Ｇ∈Ｆ。引理 2 [2 ] 　设Ｇ是有限群 ,Ｋ Ｇ ,则　Φ(Ｋ)≤Φ(Ｇ) .引理 3[3] 　设Ｆ为饱和群系 ,若Ｇ可解且ＧＦ 可换 ,则ＧＦ 在Ｇ中有补 ,且其补两两共轭。定理　设Ｆ为饱和群系 ,Ｇ为有限群 ,Ｈ Ｇ ,且Ｈ可解 ,Φ(Ｇ)≤Ｈ ,则Ｈ…     

π－超可解群

π－超可解群路在平（曲阜师范大学数学系，２７３１６５，山东省曲阜市）定义设π为一素数集．有限群Ｇ称π－超可解群，若Ｇ的主因子或为π′－群或为循环群；有正规π－补的π－超可解群称为特殊π－超可解群．易知π－超可解性对子群及商群封闭．定理１设群Ｇ是π－超...     

π—局部群系

定义了π－局部群系Ｆπ，统一了幂零群系、ｐ－零群系、π－幂零群系、超可解群系、ｐ－超可解群系，推广了著名的Ｇａｓｃｈｕｔｚ定理和Ｃａｒｔｅｒ定理     

超可解群的若干充要条件

利用Ｆｒａｔｔｉｎｉ－Ｌｉｋｅ子群Φ１（Ｇ）的性质得到了有限群为超可解的若干充要条件,并推广了著名的Ｋｒａｍｅｒ定理。     

π－局部定义群系的一个定理

推广Ｇａｓｃｈｔｚ关于幂零性的定理到一般π－局部定义群系，得到定理设为π－局部定义群系，又内的群均为可解，Ｍ，Ｄ为有限群Ｇ的正规子群，且ＤＭ，Ｄ≤Φ（Ｇ）。若，则     

与σ—sylow塔群同阶型的群

Ｊ．Ｇ．Ｔｈｏｍｐｓｏｎ在１９８７年提出了如下公开问题：Ｔｈｏｍｐｓｏｎ猜想设Ｇ＿１，Ｇ＿２是同阶型有限群，且Ｇ＿１可解，则Ｇ＿２可解．Ｔｈｏｍｐｓｏｎ猜想是一个相当困难的问题．本文初步研究了这个问题，得到如下：定理５设Ｇ＿１是σ－ｓｙｌｏｗ塔群，且Ｇ＿１与Ｇ＿２同阶型，则Ｇ＿２是σ－Ｓｙｌｏｗ塔群．推论６设Ｇ＿１是超可解群，且Ｇ＿１与Ｇ＿２同阶型．则Ｇ＿２是Ｓｙｌｏｗ塔群，因而Ｇ＿２是可解群．定理７设Ｇ＿１是幂零群，且Ｇ＿１与Ｇ＿２同阶型，则Ｇ＿２是幂零群．     

两种子群特性与有限群的超可解性

证明了：（1）设G是有限p-可解群,P∈Sylp（G）,则G是p-超可解当且仅当P的极大子群在G中半覆盖-远离或G-半置换.（2）有限群G为超可解当且仅当对于G的每个素因子p,存在P∈Sylp（G）使得P的极大子群都在G中半覆盖-远离或PFp（G）-半置换.（3）设F是包含超可解群系的饱和群系,G是有限群,H G使得G/H∈F.如果对于H的任意素因子p,存在P∈Sylp（H）使得P的极大子群都在G中半覆盖-远离或PFp（H）-半置换,则G∈F.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has