二面体群量子偶的表示环

设kG是群代数,D(kG)是其量子偶.证明了D(kG)的表示环的结构可完全由群G的共轭类代表元的中心化子子群的表示环决定.作为该结论的应用我们给出了量子偶D(kD_n)的表示环的结构,其中k是一个特征为2的域,n是奇数,D_n是2n阶二面体群.     

对称群S5与循环群C3直积的整群环的挠单位

本文研究了五次对称群S₅与三阶循环群C₃直积的整群环的正规化挠单位.作为应用,证明了S₅×C₃满足Zassenhaus猜想.     

整数环上正交群的初等表示与换位子表示

令 R 为有1的结合环,G 表 R 上某类典型群(SL_nR,SP_(2n)R,O_ ~(2n)R 等),EG 表 G的由初等阵生成的子群,G′表 G 的换位子群.令 e(G),c_n(G)分别表示最小的正整数e_n,c_n,使得 EG,G′中每一元素可至多由 e_n 个初等阵,c_n 个换位子表出。若不存在这样的有限正整数 e_n,c_n,我们说 G 对于初等阵或换位子无界.     

对称群的分歧数据系统分类

含特征标的分歧数据系统能被用来分类PM箭图Hopf代数.本文给出了对称群Sn(n≠6)上含特征标的分歧数据系统的同构类个数的计算公式.     

一类特殊的对称的块循环矩阵的特征值

In this paper, the spectrum and characteristic polynomial for a special kind of symmetric block circulant matrices are given.     

有限幂零群通过对称群扩张的整群环的正规化子性质

设G是一个有限幂零群Ⅳ通过m次对称群S_m的扩张,本文证明了G有正规化子性质.我们的定理推广了Petit Lobao与Sehgal的一个结果:设G=N(?) S_m是一个有限幂零群N与对称群S_m的自然圈积,则G有正规化子性质.我们的方法不同于Petit Lobao与Sehgal的方法.     

分次环的Smash积A#G*与单位分量Ae理想间的对应

本文对任意群G上的任意分次环A,建立了Smash积A#G^*和单位分量A_e理想间的对应关系,并运用所建立的对应关系研究分次环的Smash积A#G^*和A_e的半素性,素性和单性.     

右对称环

本文在左对称环的基础上提出了右对称环的概念,分别给出了是右对称环但不是左对称环和是左对称环但不是右对称环的例子．证明了（1）如果R是Armendariz环,则R是右对称环的充要条件R[x]是右对称环;（2）如果R是约化环,则R[x]/（x^n）是右对称环,其中（xn）是由xn生成的理想．     

任意有限Abel群上的Vinogradov不等式

本文利用群特征标的两个正交关系及任意 有限Ａｂｅｌ群Ａ上的特征标准Ａ与同构的性质,得出了任意有限Ａｂｅｌ群上Ｖｉｎｏｇｒａｄｏｖ不等的具体表达式。     

三次对称群的一个特征性质

本给出三次对称群S1的一个特征性质：有限群G恰有两个非线性共轭类当且仅当G≈S2。     

Group Rings Whose Symmetric Units are Solvable

Let K be an infinite field of characteristic different from 2, and G a group. Under suitable restrictions upon G, we classify the groups such that the symmetric units of KG satisfy the solvability identity (x ₁, x ₂,…, x _{2 ⁿ} ) ^o  = 1, for some n.     

Plane Partitions and Characters of the Symmetric Group

In this paper we show that the existence of plane partitions, which are minimal in a sense to be defined, yields minimal irreducible summands in the Kronecker product of two irreducible characters of the symmetric group S(n). The minimality of the summands refers to the dominance order of partitions of n. The multiplicity of a minimal summand equals the number of pairs of Littlewood-Richardson multitableaux of shape (, ), conjugate content and type . We also give lower and upper bounds for these numbers.     

Group Rings Whose Symmetric Units Generate an n-Engel Group

Let F be an infinite field of characteristic different from 2 and G a torsion group. Write 𝒰⁺(FG) for the set of units in the group ring FG that are symmetric with respect to the classical involution induced from the map g ? g ^?1, for all g ∈ G. We classify the groups such that ?𝒰⁺(FG)? is n-Engel.     

Applications of the Frobenius Formulas for the Characters of the Symmetric Group and the Hecke Algebras of Type A

We give a simple combinatorial proof of Ram's rule for computing the characters of the Hecke Algebra. We also establish a relationship between the characters of the Hecke algebra and the Kronecker product of two irreducible representations of the Symmetric Group which allows us to give new combinatorial interpretations to the Kronecker product of two Schur functions evaluated at a Schur function of hook shape or a two row shape. We also give a formula for the regular representation of the Hecke algebra.     

Symmetric Elements Under Oriented Involutions in Group Rings

Let RG denote the group ring of a group G over a commutative ring with unity R. Given a homomorphism σ:G → {± 1} and an involution ? of the group G, an oriented invoultion ^σ? of RG is defined in a natural way. We characterize when the set of symmetric elements under this involution is a subring. This gives a unified setting for earlier work of several authors.     

交错群A_5与二面体群D_6直积的整群环的挠单位

本文利用Luthar-Passi方法,研究了五次交错群A_5与六阶二面体群D_6直积的整群环的挠单位,得到了该群的Zassenhaus猜想成立.     

Hochschild Cohomology Ring of the Mod-2 Group Ring of the Generalized Quaternion Group

We will determine the ring structure of the Hochschild cohomology HH?( ₂ Q _t ) of the mod-2 group ring  ₂ Q _t for arbitrary generalized quaternion groups Q _t of order 4t by calculating the ordinary cup product in H?(Q _t , _ψ  ₂ Q _t ).