△-tame quasi-hereditary algebras

Let (K, M,H) be an upper triangular bimodule problem. Briistle and Hille showed that the opposite algebra A of the endomorphism algebra of a projective generator P of the matrices category of (K., M, H) is quasi-hereditary, and there is an equivalence between the category of△-good modules of A and Mat(K, M). In this note, based on the tame theorem for bimodule problems, we show that if the algebra A associated with an upper triangular bimodule problem is of△-tame representation type, then the category F(△) has the homogeneous property, i.e. almost all modules in F(△) are isomorphic to their Auslander-Reiten translations. Moreover, if (K, M,H)is an upper triangular bipartite bimodule problem, then A is of△-tame representation type if and only if F(△) is homogeneous.     

OSCILLATION FOR NONAUTONOMOUS NEUTRAL DYNAMIC DELAY EQUATIONS ON TIME SCALES

The article is concerned with oscillation of nonautonomous neutral dynamic delay equations on time scales. Sufficient conditions are established for the existence of bounded positive solutions and for oscillation of all solutions of this equation. Some results extend known results for difference equations when the time scale is the set Z of positive integers and for differential equations when the time scale is the set R of real numbers.     

ON Δ-GOOD MODULE CATEGORIES OF QUASI-HEREDITARY ALGEBRAS

A useful reduction is presented to determine the finiteness of △-good module category F(△)of a quasi-heredltary algebra. As an application of the reduction, the f(△)-finitenetess of quasi-hereditary M-twisted double incidence algebras of posets is discussed. In particular, a complete classification of F(△)-finite M-twisted double incidence algebras is given in case the posets are linearly ordered.     

Orlicz-Sobolev空间的弱局部一致凸性

本文研究了Orlicz-Sobolev空间的弱局部一致凸性.通过运用Orlicz空间和Sobolev空间的技巧,得到了赋Luxemburg范数的Orlicz-Sobolev空间具有弱局部一致凸性的充要条件和赋Orlicz范数的Orlicz-Sobolev空间具有弱局部一致凸性的充分条件.     

循环■线性■码的一些结论

令F_q是一个含有q个元素的有限域,其中q是素数p的方幂,t≥2是满足t■1 (modp)的偶数,且■是F_q的次数为t的扩域.本文给出■上的一个迹双线性型内积Δ,其中n是一个与q互素的正整数.根据定义的迹内积,研究循环Δ-自正交和循环Δ-自对偶■线性■码的基和计数.此外,给出一些参数好的■线性■码.     

左C—半群的又一结构

作为Ｃｌｉｆｆｏｒｄ半群的推广的左Ｃｌｉｆｆｏｒｄ半群（左Ｃ－半群）已有一ζ－积结构，本文给出了左Ｃ－半群的另一结构，所谓△－积结构，它的一个特殊性形恰好为左群的强半格。这一新结构为半群的Ｃｌｉｆｆｏｒｄ层次的研究伸展到拟正则半群领域奠定了基础。     

Intrinsic Knotting of Almost Complete Partite Graphs

Let G be a complete p-partite graph with 2 edges removed, p ≥ 7, which is intrinsically knotted. Let J represent any graph obtained from G by a finite sequence of ?-Y exchanges and/or vertex expansions. In the present paper, we show that the removal of any vertex of J and all edges incident to that vertex produces an intrinsically linked graph. This result offers more intrinsically knotted graphs which hold for the conjecture presented in Adams' book(Adams C. The Knot Book. New York: W. H. Freeman and Company, 1994), that is, the removal of any vertex from an intrinsically knotted graph yields an intrinsically linked graph.     

有限左 duo P-(△-)半群的分类

本文证明有限左 duo P-半群共有九类,有限左 duo△-半群共有七类,并给出各类半群的构造.     

拟遗传代数的Grothendieck群的生成关系

本文考虑拟遗传代数上的△一好模范畴Ｆ（△）的 Ｇｒｏｔｈｅｎｄｉｅｃｋ群的生成关系．利用它刻划了Ｆ（△）－有限的拟遗传代数和表示有限的直向代数．     

拟遗传代数的Grothendieck群的生成关系

本文考虑拟遗传代数上的△一好模范畴f(△)的Grothendieck群的生成关系.利用它刻划了f(△)-有限的拟遗传代数和表示有限的直向代数.     

ENTIRE CHROMATIC NUMBER AND △-MATCHING OF OUTERPLANE GRAPHS

Let G be an outerplane graph with maximum degree A and the entire chromatic number Xvef（G）. This paper proves that if △ ≥6, then △＋ 1≤Xvef（G）≤△＋ 2, and Xvef （G） = △＋ 1 if and only if G has a matching M consisting of some inner edges which covers all its vertices of maximum degree.     

Orlicz-Sobolev空间的中点局部一致凸性

本文研究了Orlicz-Sobolev空间的中点局部一致凸性，通过结合Orlicz空间和Sobolev空间的技巧得到分别赋Luxemburg范数和赋Orlicz范数的Orlicz-Sobolev空间具有中点局部一致凸性的充要条件．     

关于符号矢量法的理解、问题和建议以及对Gibbs符号的辩护

对戴振铎教授所创立的符号矢量法提出了个人的理解,基于这些理解,发现其中仍存在一些缺陷并提出了修正的建议。还就对Ｇｉｂｂｓ符号的批评作了辩护,但对其不足之处也提出了一些修正意见。     

自由半群的估计熵和△-弱混合集

本文对自由半群作用的动力系统引入了估计熵和△-弱混合集的概念,得到一些性质.通过引入△-熊混沌集,给出了△-弱混合集的一个等价刻画.     

关于普遍本源公式及其导出的公式类——∑△D类

这篇简要综述论及一个普遍本源公式(简记为GSF)以及由它导出的公式类(简称ΣΔD类).由于GSF能用以推导出许多级数展开式与求和公式及恒等式(包括一系列有名公式),所以由它演绎出的ΣΔD类,很自然成为离散数学与组合分析中的一个极为宽广的公式类.本文还通过具体例证,探讨了寻求与论证级数求和公式的"嵌入法"技巧,并给出了有关ΣΔD类结构分析的几个注记.     

一个二元周期函数类的正交投影宽度

本文得到了二元周期可微函数类△_p~r在空间L_q(T~2)中的正交投影宽度d1/N(△_p~r,L_q)的渐近精确阶．     

当△=AC—B^2=0时,对二元函数极值的探讨

设二元函数f(x,y)有稳定点P(x_0,y_0),并设f_(xx)(x_0,y_0)=A,f″_(xy)(x_0,y_0)=B,f″_(yy)(x_0,y_0)=C,△=AC-B~。当△=AC-B~2=0时,f(x,y)在点P(x_0,y_0)处是否有极值的问题,一般教科书都未进行过具体地讨论,本文对这一问题进行了初步地探     

对“三角形内切圆半径最大值”的再思考

题目：在Rt△ABC中,斜边AB=1,内切圆的半径为r,则r的最大值为——．     

一些特殊三角剖分上分片线性样条的最佳逼近问题

The critical point set plays a central role in the theory of Tchebyshev approximation.Generally,in multivariate Tchebyshev approximation,it is not a trivial task to determine whether a set is critical or not.In this paper,we study the characterization of the critical point set of S 0 1(△) in geometry,where is restricted to some special triangulations(bitriangular,single road and star triangulations).Such geometrical characterization is convenient to use in the determination of a critical point set.     

时间标度上的Taylor公式及链式法则

致力于研究时间标度上二元函数的链式法则,以期其在最优控制上有广泛的应用.同时,对一元函数的泰勒公式给出一种新的较为简单的证明方法.