S-条件置换子群对有限群结构的影响

利用子群的S-条件置换性,得到了有限超可解群的一充分条件;并得到有限群G∈F的一充分必要条件. 即:设F是一个包含所有超可解群类U的饱和群系. 则有限群G∈F,当且仅当G有一个正规子群H,使得G/H∈F且F*(H)∩G的GP极大子群在G中S-条件置换.其中GP是G的非循环Sylow子群.     

关于有限群的S-半置换子群的一点注记

利用非循环Sylow-子群的极大子群的S-半置换性质,刻画了有限群的结构,得到:令G是一个有限群,F是包含U的饱和群系,假设G有一个可解正规子群H,使得G/H∈F. 如果F(H)的每个非循环Sylow-子群的极大子群在G中S-半置换,那么G ∈F.     

有限群的弱s-置换子群

如果对群G的任意Sy low子群T,存在元素x∈G,使H Tx=TxH,则群G的子群H称为在G中弱s-置换.利用子群的弱s-置换性得出下列结果:1)设F是包含超可解群系U的饱和群系,H为G的可解正规子群.如果G/H∈F,且H的任一Sy low子群的极大子群在G中弱s-置换,则G∈F.2)设F是包含超可解群系U的饱和群系,H为G的可解正规子群.如果G/H∈F,且F(H)的任一Sy low子群的极大子群在G中弱s-置换,则G∈F.     

具有X-s-半置换的准素子群的有限群

设X是群G的非空子集,H是G的子群,如果H在G中有一个补充T使得H和T的所有Sylow子群X-置换,则称H在G中X-s-半置换.利用于群的X-s-半置换性得到下列结果:①设是包含所有超可解群的饱和群系,X是群G的可解正规子群,则G∈当且仅当存在H G使得G/H∈且H的每个Sylow子群的每个极大子群在G中X-s-半置换.②设是包含所有超可解群的饱和群系,X是群G的可解正规子群且H G.如果G/H∈且F(H)的每个Sylow子群的每个极大子群在G中X-s-半置换,则G∈③设X是群G的一个p-可解正规子群,p是|G|的最小素因子.如果G是A4-自由的,且存在H G使得G/H是p-幂零的并满足H的每个Sylow p-子群的每个2-极大子群在G中X-s-半置换,那么G是声p-幂零的.     

有限群的SS-可补子群

设H是有限群G的子群.如果存在G的一个子群K,使得G=HK且H∩K在K中S-拟正规,则称H在G中SS-可补.证明了:(i)设p是整除群G阶的最小素因子.如果存在G的一个Sylowp-子群P,使得P的每个极大子群在NG(P)中SS-可补,且P′在G中S-拟正规,则G是p-幂零群.(ii)设F是一个包含超可解群类U的饱和群系,H是群G的一个正规子群,使得G/H∈F.如果对H的每一个Sylow p-子群P,P的每个极大子群在NG(P)中SS-可补,且P′在G中S-拟正规,则G∈F.     

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.     

有限群的PCSM-子群

设G是一个有限群,H为G的子群,如果对于G的任意Sylow子群的极大子群M,至少存在M的一个共轭子群Mx,x∈G,使得HMx=MxH,则称子群H为G的PCSM-子群。考察了某些子群是PCSM-子群时的有限群结构,特别地获得了超可解群的一些充分条件。     

可解群的一些充分条件

群G的一个子群H称为在G中弱c正规的，如果存在G的一个次正规子群K，使得G=HK且H∩K≤HG，其中HG=∩↑x∈0H^x是包含在H中的G的最大正规子群,利用π-Hall子群、奇阶Sylow子群和二极大子群的弱c正规性，给出了一个群为可解群的若干充分条件。     

有限群的可补子群的相关性质

考虑有限群的极小子群和Sylow子群的可补性质对群结构的影响.设F是包含全体有限超可解群的群系,G是有限群,M>1是G的正规子群,且G/M∈F,证明:如果对M的任一极小子群H,H∩F*(GF)均在G中可补,则G∈F.     

有限群的极小子群与超可解性

利用群G的F itting子群、广义F itting子群的极小子群F-s-补条件刻划群G的结构,得到新的结果,即:设F是含U的饱和群系,G是一有限群,则G∈F的充分必要条件是存在G的可解正规子群N(或正规子群N)使得G/N∈F且F(N)(或F*(G))的所有素数阶子群在G中均有超可解-s-补.     

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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