划分格中的Mbius函数和秩生成函数

设S={1,2,…,n},P(n)是由S的所有划分组成的集合.对于π,σ∈P(n),如果π中的每个块包含在σ的一个块里,就定义π≤σ,那么P(n)作成一个格.如果M(n,k)是由S的所有k部划分组成的集合,而L(n,k)是由M(n,k)生成的格.在P(n)和L(n,k)中,给出M(o|¨)bius函数,并且确定了特征多项式和秩生成函数的表示式.     

有限格中的秩生成函数和Poincaré多项式

在一些有限格Bn,Dn,■中,利用组合系数的方法分别给出了它们的秩生成函数和Dn的特征多项式.在有限典型群子空间轨道生成的格中,利用典型群理论和计算法给出在GLn(Fqn),Sp2v(Fqn),Un(Fq2n)作用下子空间轨道生成格的秩生成函数和特征多项式,并且给出这些格的Poincaré多项式的定义,确定了它们的表示式.     

高维Mbius群的几何特征

本文利用高维Ｍｂｉｕｓ变换的Ｃｌｉｆｆｏｒｄ矩阵表示,主要讨论高维非初等Ｍｂｉｕｓ群和不连续Ｍｂｉｕｓ群,得到了它们各自的几何特征．     

高维Mbius群的几何特征

本文利用高维Ｍｂｉｕｓ变换的Ｃｌｉｆｆｏｒｄ矩阵表示,主要讨论高维非初等Ｍｂｉｕｓ群和不连续Ｍｂｉｕｓ群,得到了它们各自的几何特征．     

一类二元叠加码的卡氏积及其性质

二元叠加码d-析取矩阵是组合分组测试理论的一个极其重要的数学模型,定义了两个已知d-析取矩阵的卡氏积并证明了它的性质,最后,对这一定义进行了推广.     

偶特征正交空间上非奇异子空间的Critical问题

利用偶特征有限正交空间的性质及计数定理在偶特征有限正交空间上研究了非奇异子空间的critical问题,得到了相应的计数公式和critical指数.     

一类二元叠加码的卡氏积及其性质北大核心

二元叠加码d-析取矩阵是组合分组测试理论的一个极其重要的数学模型,定义了两个已知d-析取矩阵的卡氏积并证明了它的性质,最后,对这一定义进行了推广.     

关于循环级数的特征多项式

对于循环级数的特征多项式,人们似乎未注意到它的唯一性问题,而若是考察其唯一性,便会引出循环级数的许多有趣的性质。定理1 设P(x)=1-a_1x-a_2x~2-……-akx~k,而Q(x)是任何一个次数小于k的多项式,那末     

(p,r,d)-SC码的卡氏积

(p,r,d)-superimposed codes简称为(p,r,d)-SC码,利用两个已知的(p,r,d)-SC码定义了它们的行卡氏积,并计算了这个新(p,r,d)-SC码的参数和它的汉明距离.     

有限偏序集上格的M?bius函数和特征多项式

在一些有限格上研究了格的特征多项式,确定了它们的表示式,并且得到这些格的M(o|¨)bius函数.     

正交矩阵的特征多项式及特征根

以《高等代数习题解》(杨子胥)的两道习题为理论根据,应用正交矩阵的若干性质,给出了正交矩阵特征多项式系数的规律.     

On the Product and Factorization of Lattice Implication Algebras

In this paper,the concepts of product and factorization of lattice implication algebra areproposed,the relation between lattice implication product algebra and its factors and some properties oflattice implication product algebras are discussed.     

关于强映射下几何格的一个公开问题

In this paper, some properties of the image of the geometric lattice of a graphic matroid under a strong map are discussed, and a negative answer to the related open question of Welsh‘s book is given.     

On Characteristic Polynomials of Geometric Frobenius Associated to Drinfeld Modules

Let K be a function field over finite field and let be a ring consisting of elements of K regular away from a fixed place of K. Let be a Drinfeld -module defined over an -field L. In the case where L is a finite -field, we study the characteristic polynomial of the geometric Frobenius. A formula for the sign of the constant term of in terms of leading coefficient of is given. General formula to determine signs of other coefficients of is also derived. In the case where L is a global -field of generic characteristic, we apply these formulae to compute the Dirichlet density of places where the Frobenius traces have the maximal possible degree permitted by the Riemann hypothesis.     

途径生成函数中特征多项式的几个性质

途径生成函数Wij(G，x)记图G中从起点i到终点j的途径数目，本应用途径生成函数研究特征多项式的性质，得到了若干新的结果．     

On the Orthogonality of Geometric Codes

We solve some problems concerning the orthogonality of geometric codes associated with sets of i- and j-dimensional subspaces of PG(n, q). Various applications are found, and we discuss all the interesting cases in small dimensional spaces.     

Characteristic and Ehrhart Polynomials

Let A be a subspace arrangement and let (A,t) be the characteristic polynomial of its intersection lattice L( A). We show that if the subspaces in A are taken from , where is the type B Weyl arrangement, then (A,t) counts a certain set of lattice points. One can use this result to study the partial factorization of (A,t) over the integers and the coefficients of its expansion in various bases for the polynomial ring R[t]. Next we prove that the characteristic polynomial of any Weyl hyperplane arrangement can be expressed in terms of an Ehrhart quasi-polynomial for its affine Weyl chamber. Note that our first result deals with all subspace arrangements embedded in while the second deals with all finite Weyl groups but only their hyperplane arrangements.     

关于Bernstein多项式的一个特征

本文建立Ｂｅｒｎｓｔｅｉｎ多项式Ｂｎ（ｆ，ｘ）的阶是的一个特征定理。     

一类六角系统图的特征多项式及应用

Let Ln be the hexagonal chain graph,Fnbe the hexacyclic system graph and Mn be the M¨obius hexacyclic system graph. Derflinger and Sofer gave the spectra of Ln and Fn by using group theoretical method. Later, Gutman gave the spectra of them using a polynomial result due to Godsil and McKay. In this paper, we give a simple and direct method to determine the characteristic polynomial and spectra of Fn and Ln. By the method, we give the characteristic polynomial and spectrum of Mn that is new. Additionally, the exact values of total π-electron energy and the nullities of Ln, Fn and Mn are obtained, and the bounds for the energy of Ln and Mn are also considered.     

求三对角矩阵特征多项式一种简便方法

本文通过递推关系 ,直接给出求三对角矩阵特征多项式的一种简便方法 .该方法具有操作简单 ,计算量小的特点 .并给出算例 .