发生式定义的概念教学初探

数学概念是反映一类事物在数量关系和空间形式方面的本质属性的思维形式,它是排除一类对象的具体物质内容以后的抽象,反映的是一类对象内在的、固有的属性,因而在这一类对象范围内具有普遍意义.     

仿射李代数A_1~(1)的不属于范畴0的一类可积模的结构及分类

<正> 本文研究的是仿射李代数A_1~(1)的不属于范畴0的一类可积模.目前对这一类模的研究似乎还很少,但可以肯定这是一类具有重要意义的模.本文仅对A_1~(1)的这一类模进行探讨.决定了A_1~(1)的这一类不可约模的结构及分类.     

一类Reinhardt陆启铿域

由陆启铿猜想在一类Reinhardt域上的解决,得到了一类Reinhardt陆启铿域,同时又给出了此域是非齐性域,从而得到一类非齐性的陆启铿域.     

中心条件推导的间接方法

对于一类多项式系统,给出两类对称条件的推导算法,具体讨论了一类三次系统的中心条件;对于Poincare型系统,给出一类等时中心的充分条件．     

齐次群上二阶半线性偏微分方程的一类Picone型恒等式和Sturmian比较定理

本文给出了齐次群上的一类广义Picone型恒等式,由此证明了以下半线性方程组(其中 表示齐次群上的广义梯度)的Sturmian比较定理及一类振荡定理,并用于Heisenberg群上一类半线性方程.然后利用这里的广义Picone型恒等式证明了Heisenberg群上一类更一般的Hardv型不等式     

关于图的最大亏格的结果

提供了一类新的上可嵌入图类,并且得到了一类直径为2的二连通伪图以及一类直径为4的重图的最大亏格的紧下界,这推广了Skoviera的一个结果．     

一类非线性不等式组的相容性及其应用

本文讨论了一类非线性不等式组的相容性,给出了其相容的充分必要条件．利用其相容性,我们分别给出了一类非线性规划的解析最优解和一类几何规划有最优解的判定条件     

一类特征值问题及其应用

研究一类特征值问题及其应用.首先应用常微分方程理论讨论一类边值问题非平凡解的存在唯一性,并将该研究结果应用到一类弹性系统的镇定问题.得到了系统渐近稳定的充分条件.     

Abel群在数论函数中的一个应用

<正> 数论函数是研究数论的极其重要的工具。用群的观点研究一类数论函数,能使一类数论函数的证明简易,能对一类数论函数的认识更加清晰,下面仅就一类数论函数形成Abel群作一介绍,并通过化简证明标准的 Mobius变换定理(下面简称标准定理),说明其应用.     

一类离散双险种风险模型

本研究了一类离散双险种风险模型，其中一类险种的索赔到达为泊松随机序列，另一类险种的索赔到达为二项随机序列．得到了最终破产概率的Lundberg不等式以及一般表达式．     

调和单叶函数族的一些结果

借用著名的Ruscheweyh导数,引入了一类单叶保向调和函数族. 通过建立极值理论,得到了关联该族的最优系数边界、最优增长定理和最优偏差定理. 同时,给出了该族与先前已有调和函数族之间的转换半径. 最后,讨论了基于该族的修正哈达玛乘积结果.     

On the class of disjoint limited completely continuous operators

We introduce and study new class of sets (almost L-limited sets). Also, we introduce new concept of property in Banach lattice (almost Gelfand–Phillips property) and we characterize this property using almost L-limited sets. On the other hand, we introduce the class of disjoint limited completely continuous operators which is a largest class than that of limited completely continuous operators, we characterize this class of operators and we study some of its properties.     

A new class of projectively flat Finsler metrics with constant flag curvature K=1

In this paper, we consider a class of Finsler metrics which obtained by Kropina change of the class of generalized m-th root Finsler metrics. We classify projectively flat Finsler metrics in this class of metrics. Then under a condition, we show that every projectively flat Finsler metric in this class with constant flag curvature is locally Minkowskian. Finally, we find necessary and sufficient condition under which this class of metrics be locally dually flat.     

Skew partial fields,multilinear representations of matroids,and a matrix tree theorem

We extend the notion of representation of a matroid to algebraic structures that we call skew partial fields. Our definition of such representations extends Tutte?s definition, using chain groups. We show how such representations behave under duality and minors, we extend Tutte?s representability criterion to this new class, and we study the generator matrices of the chain groups. An example shows that the class of matroids representable over a skew partial field properly contains the class of matroids representable over a skew field. Next, we show that every multilinear representation of a matroid can be seen as a representation over a skew partial field. Finally we study a class of matroids called quaternionic unimodular. We prove a generalization of the matrix tree theorem for this class.     

On the existence of certain error formulas for a special class of ideal projectors

In this paper, we focus on a special class of ideal projectors. With the aid of algebraic geometry, we prove that for this special class of ideal projectors, there exist “good” error formulas as defined by C. de Boor. Furthermore, we completely analyze the properties of the interpolation conditions matched by this special class of ideal projectors, and show that the ranges of this special class of ideal projectors are the minimal degree interpolation spaces with regard to their associated interpolation conditions.     

格群的子积类

ｌ－群的一个类称作是子积类，如果它封闭于取凸ｌ－子群及完全次直积。设ｕ是一个子积类，Ｇ是一个ｌ－群。令为Ｇ的直和项且Ｇ／Ｈ∈ｕ｝称作是Ｇ的一个子积根式．我们在本文中证明了一个子积类Ｕ由于积根式映射Ｇ→Ｕ（Ｇ）所决定。我们还证明了在子积类的完备格Ｔ中，一组子积类，由子积根式映射所决定，而并则由子积根式映射所决定．这是一个很漂亮的结果。     

Modular and lower-modular elements of lattices of semigroup varieties

The paper contains three main results. First, we show that if a commutative semigroup variety is a modular element of the lattice Com of all commutative semigroup varieties then it is either the variety $\mathcal{COM}$ of all commutative semigroups or a nilvariety or the join of a nilvariety with the variety of semilattices. Second, we prove that if a commutative nilvariety is a modular element of Com then it may be given within $\mathcal{COM}$ by 0-reduced and substitutive identities only. Third, we completely classify all lower-modular elements of Com. As a corollary, we prove that an element of Com is modular whenever it is lower-modular. All these results are precise analogues of results concerning modular and lower-modular elements of the lattice of all semigroup varieties obtained earlier by Je?ek, McKenzie, Vernikov, and the author. As an application of a technique developed in this paper, we provide new proofs of the ??prototypes?? of the first and the third our results.     

Full residual finiteness growths of nilpotent groups

Full residual finiteness growth of a finitely generated group G measures how efficiently word metric n-balls of G inject into finite quotients of G. We initiate a study of this growth over the class of nilpotent groups. When the last term of the lower central series of G has finite index in the center of G we show that the growth is precisely n^b, where b is the product of the nilpotency class and dimension of G. In the general case, we give a method for finding an upper bound of the form n^b where b is a natural number determined by what we call a terraced filtration of G. Finally, we characterize nilpotent groups for which the word growth and full residual finiteness growth coincide.     

Topological Entropy of a Class of Subshifts of Finite Type

In this paper, we construct a special class of subshifts of finite type. By studying the spectral radius of the transfer matrix associated with the subshift of finite type, we obtain an estimation of its topological entropy. Interestingly, we find that the topological entropy of this class of subshifts of finite type converges monotonically to log(n + 1) (a constant only depends on the structure of the transfer matrices) as the increasing of the order of the transfer matrices.