Infinite Sequence Soliton-Like Exact Solutions of (2 + 1)-Dimensional Breaking Soliton Equation

To seek new infinite sequence soliton-like exact solutions to nonlinear evolution equations （NEE（s））, by developing two characteristics of construction and mechanization on auxiliary equation method, the second kind of elliptie equation is highly studied and new type solutions and Backlund transformation are obtained. Then （2＋ l ）-dimensional breaking soliton equation is chosen as an example and its infinite sequence soliton-like exact solutions are constructed with the help of symbolic computation system Mathematica, which include infinite sequence smooth soliton-like solutions of Jacobi elliptic type, infinite sequence compact soliton solutions of Jacobi elliptic type and infinite sequence peak soliton solutions of exponential function type and triangular function type.

Constructing infinite sequence exact solutions of nonlinear evolution equations

To construct the infinite sequence new exact solutions of nonlinear evolution equations and study the first kind of elliptic function, new solutions and the corresponding B^cklund transformation of the equation are presented. Based on this, the generalized pentavalent KdV equation and the breaking soliton equation are chosen as applicable examples and infinite sequence smooth soliton solutions, infinite sequence peak solitary wave solutions and infinite sequence compact soliton solutions are obtained with the help of symbolic computation system Mathematica. The method is of significance to search for infinite sequence new exact solutions to other nonlinear evolution equations.

Exact Sequence and Commutative Diagrams of Semimodule Homomorphism

Throught the introduction of the concept * exact sequence,we set up several satisfied results of commutative diagrams of semimodule homomorphism.

关于n-纯同调维数的注记

为了研究环与模的n-纯同调维数,通过同调的方法,分别给出了n-纯投射模与n-纯内射模的一些新刻画.作为应用,证明了环R的n-纯投射整体维数不超过1的充分必要条件是R的n-纯内射整体维数不超过1,得到了一个环R的n-纯投射整体维数与R的n-纯内射整体维数的对应关系.

复形的Gorenstein(L,A)-内射维数

设(L,A)是一给定的完备对偶对.首先,引入复形的Gorenstein(L,A)-内射维数,给出其刻画,并证明复形的Gorenstein(L,A)-内射维数不超过内射维数;其次,讨论复形的相对上同调和Tate上同调,得到联系绝对、相对、Tate上同调的长正合序列.

基于诣零根是素理想的两类广义正合序列

通过引入弱非诣零同态像的概念,结合非诣零同态像与非诣零同态核,基于诣零根是素理想而得到的φ-正合序列和N-正合序列及其关系得以刻画。作为应用,相关结果推广到了乘法封闭子集的情况。

Avramov–Martsinkovsky Type Exact Sequences with Tor Functors

For two classes of right R-modules W, X such that P W X, where P is the class of projective right R-modules, we show that there is an Avramov-Martsinkovsky type exact sequence with generalized Tate homology functor Tor^X,W, relative homology functors Tor^W and Tor^X. Many results in Iacob [Comm. Algebra, 35, 1589-1606 （2007）] and Liang [Algebr. Represent. Theory, 16, 1541-1560 （2013）] are generalized and improved.

空间偶与其商空间的未约化同调理论

在代数拓扑理论中,空间偶与其商空间的未约化同调理论作为一个重要定理.文章主要证明了如下结论:若对于包含映射i:A→X是一个上纤维,那么对于所有的自然数n∈Z^(+),存在一个自然投射p:(X,A)→(X/A,{*})诱导出同构映射射p*:h*(X,A)→≅h_(*)(X/A,{*}).我们的结果依赖于同调函子的切除公理和正合序列公理以及相应的拓扑空间性质.

Categories of exact sequences with projective middle terms

Let A be a finite-dimensional algebra over an algebraically closed field k,ε the category of all exact sequences in A-rood, Mp （respectively, Ml） the full subcategory of C consisting of those objects with projective （respectively, injective） middle terms. It is proved that Mp （respectively, MI） is contravariantly finite （respectively, covariantly finite） in ε. As an application, it is shown that Mp = MI is functorially finite and has Auslander-Reiten sequences provided A is selfinjective. Keywords category of exact sequences, contravariantly finite subcategory, functorially finite subcategory Auslander-Reiten sequences, selfinjective algebra

半模正合列

在陈培慈、周媛兰文章中半模正合列的概念的基础上,定义了半模的短正合列,并把环上模的正合列的一些性质推广到半模范畴中,得到了半模正合列上的"五引理".

i-内射半模

该文给出了i-内射半模的概念及一些较好的特征刻划,并讨论了内射半模与i-内射半模的关系.主要有左R半模E是i-内射半模当且仅当反变函子HomR(-,E)真正合,并通过给出弱内射半模的定义得出左R-半模E是内射半模当且仅当E既是弱内射半模又是i-内射半模.

p-内射半模

给出p-内射半模的概念,并在此基础上刻划了p-内射半模与Hom函子的关系.接下来证得p-内射半模的直积与直和仍保持是p-内射半模。以及讨论了在无零因子半环中,p-内射半模与可除半模的关系。最后由于p-内射半模定义的条件比内射半模弱,证明了在任意真半环上存在非零的p-内射半模。

i-内射半模的Hom函子刻划

给出i-内射半模的定义后,通过讨论Hom函子是否保持真正合列与短真正合列,得到了i-内射半模的一个重要等价刻画,即把环模的相应结果成功地推广至i-内射半模上。

关于内射半模的Hom函子刻划

该文主要研究内射半模的性质,得到了一些较好的结论,如E是左R-内射半模当且仅当Hom函子保持真正合列.

Abel范畴的正合列与同态定理

证明了在Abel范畴中几个有趣的正合交换图命题,并应用其思想得到了Abel范畴的同态定理、短四引理和单满同态分解定理,统一了环模、BCK-代数、交换群层和粗糙模范畴的相关结果.

可消半模的正合列

设A和B是S-半模,f:A→B是半模同态.ΔA和Kf分别定义为ΔA={(a,b)∈A×A|a+m=b+m,存在m∈A}和Kf={(a,b)∈A×A|f(a)+m=f(b)+m,存在m∈B}.将Kf和ΔA同时缩小为所规定的Kerf和ΔA,重新给出了monic和epic不同的定义,从不同的角度对某类特殊的半模—可消半模的正合列进行了刻画.

ζs-内射模

令ζs表半环S上的所有可消半模组成的范畴.M.Hall已证明所有可消半模必存在ζs-内射包,并且每一个ζs-内射半模必是S-模.该文将在此基础上研究ζs-内射模对正合列的作用,并引进内射维数对半环S进行初步的分类.最后,指出半环S存在非零ζs-内射模当且仅当S为non-zeroic半环.

配电网电容电流的准确预测

配电网电容电流的准确测量是消弧线圈调节、补偿消弧的前提。本文分析了现有电网电容电流检测方法的特点;提出了单相附加电阻预测故障接地电容电流的新方法;该方法通过测量单相附加电阻后的电网零序电压和接地电阻上的电压,就能在电网正常运行时准确预测出电网发生单相接地故障时的电容电流。设计了基于此新方法,利用DSP实现的智能型电容电流预测装置方案;利用模拟电网对装置预测的准确性进行了验证。结果表明,该系统不仅能准确预测电网发生单线接地故障时的电容电流、对地绝缘电阻电流、接地点的残流等影响熄弧的关键参数,还能检测谐振电网的补偿状态,且操作安全、测量迅速、简便易用。

半模的Z-同态与正合列

文章利用[1]中建立的半模monic和半模epic的方法,探讨了半模的Z-同态的某些性质;透过半模的Z-同态这个角度,得到了一类半模短正合列的一些刻画。

关于半群的局部化

局部化是交换代数中的重要研究方法．将局部化概念推广到交换半群S上，得到了S上若干局部性质，这对用局部化方法研究半群很有意义．