C~*-代数的Cuntz半群(英文)

令A是一个C~*-代数.设(x,y)是A的Cuntz半群W(A)中的一个元素对.本文在适当的条件下具体刻画了所有的(x,y),使其满足性质:如果x≤y,那么存在z∈W(A)使得x+z=y.另外,本文还讨论了交换C~*-代数关于Cuntz比较的一些性质.     

N(2,2,0)代数中平移变换的象与逆象

作为可约化半群的推广,引入了半群左(右)可约化的概念,讨论了N(2,2,0)代数中三类平移变换的象、逆象的代数结构.     

关于N(2,2,0)代数的软理想

本文将软集引入到N(2,2,0)代数,给出了软理想、软关联理想、软正关联理想的概念,讨论了它们之间的相互关系;得到了N(2,2,0)代数的软理想、软关联理想和软正关联理想的等价刻画,并研究了它们在软集运算下的若干基本性质;最后,探讨了软理想的像与原像的基本性质。     

弱(D)-反演半群上的强(D)-同余Ⅱ

刻画了弱(D)-反演半群S(P)上满足P-trμN=πN的最大的强(D)-同余;给出了S(P)上的特征核正规系的一种抽象刻画.     

N(2,2,0)代数的稳定化子与同余分解

为了深入研究N(2,2,0)代数的代数结构,首先利用代数的推理方法进一步研究了N(2,2,0)代数的稳定化子,改进了以前学者的部分结果,然后利用稳定化子建立了一种同余关系,给出了N(2,2,0)代数的同余分解,证明了其商代数仍是N(2,2,0)代数,并获得了自然同态下一类逆像的代数结构和性质.     

弱(F)-反演半群上的模糊(F)-核正规系

借助于模糊(F)-核正规系刻画了弱(F)-反演半群S(P)上的强(F)-同余.证明了S(P)上的每一个模糊强(F)-同余都是由它的模糊(F)-核正规系所唯一决定的.     

N(2,2,0)代数的T-模糊子代数和T-模糊理想

为了深入研究N(2,2,0)代数的代数结构,在N(2,2,0)代数中引入了T模糊子代数和T模糊理想的概念,进一步讨论了它们的性质.分别给出了N(2,2,0)代数的模糊子代数和模糊理想与子代数和理想的关系.证明了N(2,2,0)代数的两个T模糊子代数的模交也是T模糊子代数,而N(2,2,0)代数的两个T模糊理想的模交也是T模糊理想.     

N(2,2,0)代数的Ω-犹豫模糊关联理想

在N(2,2,0)代数中定义了 Ω-犹豫模糊关联理想,研究Ω-犹豫模糊关联理想的性质以及等价刻画,得到了 Ω-犹豫模糊关联理想的交与并的不变性的结论,讨论了 Ω-犹豫模糊关联理想与犹豫模糊关联理想的关系.     

单位积决定的若当矩阵代数(英文)

本文研究了单位积决定的若当矩阵代数M=Mn(R)的条件及分类问题.利用基矩阵及巧妙对对称双线性映射{·,·}进行构造和扩充,用初等矩阵的方法,获得了一系列新的同样重要的定义,结论与证明(与参考文献[1]相比较),推广了参考文献[1]的结论,作为其应用可以进一步证明了Mn(R)上的任意可逆线性映射都是保单位积的.     

唯一分解整半群上的Mbius函数及其反演公式(英文)

陈兆斗首先在文献 [1 ]中定义出了有单位元并满足消去律的唯一分解交换半群上的M bius函数。本文我们首先证明了M bius函数作为半群 (M1, )上的元素是常值函数ζ( ·)的逆函数。其后获得了该M bius函数的一些相关结果并给出了三个M bius反演公式     

Projection representable relations on Menger (2, n)-semigroups

Abstract characterizations of relations of nonempty intersection, inclusion end equality of domains for partial n-place functions are presented. Representations of Menger (2, n)-semigroups by partial n-place functions closed with respect to these relations are investigated.     

D(β)-vertex-distinguishing total coloring of graphs

A new concept of the D(β)-vertex-distinguishing total coloring of graphs, i.e., the proper total coloring such that any two vertices whose distance is not larger than β have different color sets, where the color set of a vertex is the set composed of all colors of the vertex and the edges incident to it, is proposed in this paper. The D(2)-vertex-distinguishing total colorings of some special graphs are discussed, meanwhile, a conjecture and an open problem are presented.     

The isometric extension of the into mapping from the unit sphere S 1( E ) to S 1( l ∞(Γ))

This paper considers the isometric extension problem concerning the mapping from the unit sphere S ₁(E) of the normed space E into the unit sphere S ₁(l ^∞(Γ)). We find a condition under which an isometry from S ₁(E) into S ₁(l ^∞(Γ)) can be linearly and isometrically extended to the whole space. Since l ^∞(Γ) is universal with respect to isometry for normed spaces, isometric extension problems on a class of normed spaces are solved. More precisely, if E and F are two normed spaces, and if V ₀: S ₁(E) → S ₁(F) is a surjective isometry, where c ₀₀(Γ) ⊆ F ⊆ l ^∞(Γ), then V ₀ can be extended to be an isometric operator defined on the whole space. This work is supported by Natural Science Foundation of Guangdong Province, China (Grant No. 7300614)     

两个同类的E_((2))型空间线性等距映射的表现定理

该文得到了两个同类的E_((2))型空间单位球面间等距线性算子的表现定理,这是首次在非具体范数的情形下取得此类结果.     

非自治p(t)-拉普拉斯系统周期解的存在性

本文研究一类非自治p(t)-Laplace系统.利用鞍点定理和极小作用原理,获得了周期解存在的充分条件,推广和改进了文献[8]中的结果.     

(H,R)-Lie coalgebras and (H,R)-Lie bialgebras

Given an (H,R)-Lie coalgebra Γ, we construct (H,R _T )-Lie coalgebra Γ^T through a right cocycle T, where (H,R) is a triangular Hopf algebra, and prove that there exists a bijection between the set of (H,R)-Lie coalgebras and the set of ordinary Lie coalgebras. We also show that if (L, [, ], Δ, R) is an (H,R)-Lie bialgebra of an ordinary Lie algebra then (L ^T , [, ], Δ_T, R _T ) is an (H,R _T )-Lie bialgebra of an ordinary Lie algebra.     

Hilbert空间上线性算子广义逆A(2)T,S的存在性及其表示式

设H₁和H₂是两个Hilbert空间, B(H₁,H₂)表示从H₁到H₂的所有有界线性算子的集合, T和S分别是H₁和H₂的两个闭子空间. 如果存在线性算子X ∈ B(H₂,H₁)满足XAX=X, R(X)=T, N(X)=S,则称X为线性算子$A$的具有指定像空间T和零空间S的外逆,记为A⁽²⁾_T,S. 该文进一步研究了线性算子广义逆A⁽²⁾_T,S存在的若干等价条件及其性质,建立了算子广义逆A⁽²⁾_T,S的表示形式.     

The Local Index Formula for SU q (2)

We discuss the local index formula of Connes–Moscovici for the isospectral noncommutative geometry that we have recently constructed on quantum SU(2). We work out the cosphere bundle and the dimension spectrum as well as the local cyclic cocycles yielding the index formula. (Received: January 2005)     

Bifurcations of travelling wave solutions for the mK(n, n) equation

Using the method of planar dynamical systems to the mK(n, n) equation, the existence of uncountably infinite many smooth and non-smooth periodic wave solutions, solitary wave solutions and kink and anti-kink wave solutions is proved. Under different parametric conditions, various sufficient conditions to guarantee the existence of the above solutions are given. All possible exact explicit parametric representations of smooth and non-smooth travelling wave solutions are obtain.