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Extensions of the category of comodules of the Taft algebra Taft代数的模范畴的扩展
Q3 MATHEMATICS Pub Date : 2023-06-29 DOI: 10.24330/ieja.1385160
Adriana MEJIA CASTANO
We construct a family of non-equivalent pairwise extensions of the category of comodules of the Taft algebra, which are equivalent to representation categories of non-triangular quasi-Hopf algebras.
构造了Taft代数的模范畴的非等价对扩展族,等价于非三角拟hopf代数的表示范畴。
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引用次数: 0
The group of splendid Morita equivalences of principal $2$-blocks with dihedral and generalised quaternion defect groups 具有二面体和广义四元缺陷群的 2 美元主块的精彩莫里塔等价群
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-06-13 DOI: 10.24330/ieja.1402947
cCisil Karaguzel, D. Yılmaz
Let $k$ be an algebraically closed field of characteristic $2$, let $G$ be a finite group and let $B$ be the principal $2$-block of $kG$ with a dihedral or a generalised quaternion defect group $P$. Let also $calT(B)$ denote the group of splendid Morita auto-equivalences of $B$. We show that begin{align*} calT(B)cong Out_P(A)rtimes Out(P,calF), end{align*} where $Out(P,calF)$ is the group of outer automorphisms of $P$ which stabilize the fusion system $calF$ of $G$ on $P$ and $Out_P(A)$ is the group of algebra automorphisms of a source algebra $A$ of $B$ fixing $P$ modulo inner automorphisms induced by $(A^P)^times$.
让 $k$ 是一个特征为 2$ 的代数闭域,让 $G$ 是一个有限群,让 $B$ 是 $kG$ 的主 2$ 块与一个二面体或广义四元缺陷群 $P$。同时让 $calT(B)$ 表示 $B$ 的精彩莫里塔自等价群。我们将证明 calT(B)cong Out_P(A)rtimes Out(P,calF), end{align*} 其中$Out(P、calF)$是$P$的外自变量群,它稳定了$G$在$P$上的融合系统$calF$;$Out_P(A)$是$B$的源代数$A$的代数自变量群,它固定了$P$,并调制了由$(A^P)^times$诱导的内自变量。
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引用次数: 0
On $NH$-embedded and $SS$-quasinormal subgroups of finite groups 有限群的$NH$-嵌入和$SS$-拟正规子群
Q3 MATHEMATICS Pub Date : 2023-05-24 DOI: 10.24330/ieja.1299719
Weicheng ZHENG, Liang CUI, Wei MENG, Jiakuan LU
Let $G$ be a finite group. A subgroup $H$ is called $S$-semipermutable in $G$ if $HG_p$ = $G_pH$ for any $G_pin Syl_p(G)$ with $(|H|, p) = 1$, where $p$ is a prime number divisible $|G|$. Furthermore, $H$ is said to be $NH$-embedded in $G$ if there exists a normal subgroup $T$ of $G$ such that $HT$ is a Hall subgroup of $G$ and $H cap T leq H_{overline{s}G}$, where $H_{overline{s}G}$ is the largest $S$-semipermutable subgroup of $G$ contained in $H$, and $H$ is said to be $SS$-quasinormal in $G$ provided there is a supplement $B$ of $H$ to $G$ such that $H$ permutes with every Sylow subgroup of $B$. In this paper, we obtain some criteria for $p$-nilpotency and Supersolvability of a finite group and extend some known results concerning $NH$-embedded and $SS$-quasinormal subgroups.
让 $G$ 做一个有限的群体。子组 $H$ 叫做 $S$-半可变的 $G$ 如果 $HG_p$ = $G_pH$ 对于任何 $G_pin Syl_p(G)$ 有 $(|H|, p) = 1$,其中 $p$ 质数能被整除吗 $|G|$. 此外, $H$ 据说是 $NH$-嵌入 $G$ 如果存在正常子组 $T$ 的 $G$ 这样 $HT$ 霍尔的子群是什么 $G$ 和 $H cap T leq H_{overline{s}G}$,其中 $H_{overline{s}G}$ 是最大的 $S$的半置换子群 $G$ 包含在 $H$,和 $H$ 据说是 $SS$-拟正态 $G$ 只要有补充 $B$ 的 $H$ 到 $G$ 这样 $H$ 的每个Sylow子群置换 $B$. 在本文中,我们得到了 $p$有限群的-幂零性和超可解性,推广了有关的一些已知结果 $NH$-嵌入式和 $SS$-拟正规子群。
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引用次数: 0
Rings with divisibility on ascending chains of ideals 在理想的上升链上有可分的环
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-05-20 DOI: 10.24330/ieja.1299720
Oussama Aymane Es Safi, N. Mahdou, M. Yousif
According to Dastanpour and Ghorbani, a ring $R$ is said to satisfy divisibility on ascending chains of right ideals ($A C C_{d}$) if, for every ascending chain of right ideals $I_{1} subseteq I_{2} subseteq I_{3} subseteq I_{4} subseteq ldots $ of $R$, there exists an integer $k in mathbb{N}$ such that for each $i geq k$, there exists an element $a_{i} in R$ such that $I_{i} =a_{i} I_{i +1}$. In this paper, we examine the transfer of the $A C C_{d}$-condition on ideals to trivial ring extensions. Moreover, we investigate the connection between the $A C C_{d}$ on ideals and other ascending chain conditions. For example we will prove that if $R$ is a ring with $A C C_{d}$ on ideals, then $R$ has $A C C$ on prime ideals.
根据Dastanpour和Ghorbani,环$R$被认为满足右理想的升链($AC C_{d}$)上的可分性,如果对于$R$的每一个右理想的上升链$I_,R$中存在元素$a_{i},使得$i_。本文研究了理想上的$ACC_{d}$条件向平凡环扩张的转移。此外,我们还研究了理想上的$ACC_{d}$与其他升链条件之间的联系。例如,我们将证明,如果$R$是理想上有$AC C_{d}$的环,那么$R$在素理想上有$AC C$。
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引用次数: 0
The dual notion of $r$-submodules of modules r的对偶概念-模块的子模块
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-05-18 DOI: 10.24330/ieja.1299269
Faranak Farshadifar
Let $R$ be a commutative ring with identity and let $M$ be an $R$-module. A proper submodule $N$ of $M$ is said to be an $r$-submodule if $amin N$ with $(0:_Ma)=0$ implies that $m in N$ for each $ain R$ and $min M$. The purpose of this paper is to introduce and investigate the dual notion of $r$-submodules of $M$.
设$R$是具有恒等式的交换环,设$M$是$R$-模。一个$M$的适当子模$N$被称为$r$子模,如果$aminN$中的$(0:_Ma)=0$意味着r$中的$AinN$MinM$中的每个$Ain N$。本文的目的是引入并研究$r$的对偶概念——$M$的子模。
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引用次数: 0
Two generalized derivations on Lie ideals in prime rings 素环中李理想的两个广义导数
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-04-12 DOI: 10.24330/ieja.1281636
Ashutosh Pandey, B. Prajapati
Let $R$ be a prime ring of characteristic not equal to $2$, $U$ be the Utumi quotient ring of $R$ and $C$ be the extended centroid of $R$. Let $G$ and $F$ be two generalized derivations on $R$ and $L$ be a non-central Lie ideal of $R$. If $FBig(G(u)Big)u = G(u^{2})$ for all $u in L$, then one of the following holds: (1) $G=0$.(2) There exist $p,q in U$ such that $G(x)=p x$, $F(x)=qx$ for all $x in R$ with $qp=p$.(3) $R$ satisfies $s_4$.
设$R$是特征不等于$2$的素数环,$U$是$R$的Utumi商环,$C$是$R的扩展质心。设$G$和$F$是$R$上的两个广义导子,$L$是$R的非中心李理想。如果对于L$中的所有$u,$FBig(G(u)Big)u=G(u^{2})$,则下列条件之一成立:(1)$G=0$。(2) U$中存在$p,q,使得$G(x)=px$,$F(x)=qx$适用于R$中所有$x,$qp=p$。(3) $R$满足$s_4$。
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引用次数: 0
Unipotent diagonalization of matrices 矩阵的单元对角化
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-04-12 DOI: 10.24330/ieja.1281654
G. Călugăreanu
An element $u$ of a ring $R$ is called textsl{unipotent} if $u-1$ is nilpotent. Two elements $a,bin R$ are called textsl{unipotent equivalent} if there exist unipotents $p,qin R$ such that $b=q^{-1}ap$. Two square matrices $A,B$ are called textsl{strongly unipotent equivalent} if there are unipotent triangular matrices $P,Q$ with $B=Q^{-1}AP$. In this paper, over commutative reduced rings, we characterize the matrices which are strongly unipotent equivalent to diagonal matrices. For $2times 2$ matrices over B'{e}zout domains, we characterize the nilpotent matrices unipotent equivalent to some multiples of $E_{12}$ and the nontrivial idempotents unipotent equivalent to $E_{11}$.
如果$u-1$是幂零的,则环$R$的元素$u$被称为textsl{unipotent}。R$中的两个元素$a,b被称为textsl{单势等价},如果R$中存在单势$p,q,使得$b=q^{-1}ap$。如果存在具有$B=Q的单幂三角矩阵$P,Q$,则两个平方矩阵$A,B$被称为textsl{强单幂等价}^{-1}AP$。本文在交换约化环上,刻画了与对角矩阵强单极等价的矩阵。对于B'上的$2乘以2$矩阵{e}zout在域中,我们刻画了等价于$E_{12}$的一些倍数的幂零矩阵单势和等价于$E.{11}$的非平凡幂等矩阵单势。
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引用次数: 0
Minimal rings related to generalized quaternion rings 与广义四元数环相关的极小环
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-04-12 DOI: 10.24330/ieja.1281705
The family of rings of the form frac{mathbb{Z}_{4}left langle x,y right rangle}{left langle x^2-a,y^2-b,yx-xy-2(c+dx+ey+fxy) right rangle} is investigated which contains the generalized Hamilton quaternions over $Z_4$. These rings are local rings of order 256. This family has 256 rings contained in 88 distinct isomorphism classes. Of the 88 non-isomorphic rings, 10 are minimal reversible nonsymmetric rings and 21 are minimal abelian reflexive nonsemicommutative rings. Few such examples have been identified in the literature thus far. The computational methods used to identify the isomorphism classes are also highlighted. Finally, some generalized Hamilton quaternion rings over $Z_{p^s}$ are characterized.
形式为frac{mathbb的环族{Z}_{4} 研究了$Z_4$上包含广义Hamilton四元数的leftlangle x,yrightlangle}{left langle x^2-a,y^2-b,yx-xy-2(c+dx+ey+fxy)rightrangle}。这些环是256阶的局部环。这个族有256个环,包含在88个不同的同构类中。在88个非同构环中,10个是极小可逆非对称环,21个是极小阿贝尔自反非共交换环。到目前为止,在文献中很少发现这样的例子。还强调了用于识别同构类的计算方法。最后,刻画了$Z_{p^s}$上的一些广义Hamilton四元数环。
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引用次数: 0
$(n,d)$-$mathcal{X}_R$-phantom and $(n,d)$-$_Rmathcal{X}$-cophantom morphisms $(n,d)$-$mathcal{X}_R$phantom和$(n,d)$-$_Rmathcal{X}$-cophantom态射
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-03-05 DOI: 10.24330/ieja.1260503
Mourad Khattari, D. Bennis
Several authors have been interested in some like phantom morphisms such as $d$-phantoms, $d$-$operatorname{Ext}$-phantoms, neat-phantom morphisms, clean- cophantom morphisms, $RD$-phantom morphisms and $RD$-$operatorname{Ext}$-phantom morphisms. In this paper, we prove that these notions can be unified. We are mainly interested in proving that the majority of the existing results hold true in our general framework.
一些作者对一些幻影态射很感兴趣,如$d$-phantom, $d$-$operatorname{Ext}$-phantom,整洁幻影态射,干净幻影态射,$RD$-phantom态射和$RD$-$operatorname{Ext}$-phantom态射。在本文中,我们证明了这些概念可以统一。我们主要感兴趣的是证明大多数现有结果在我们的一般框架下是正确的。
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引用次数: 0
A note on Friendly and Solitary Groups 关于友好群和孤立群的一个注记
IF 0.6 Q3 MATHEMATICS Pub Date : 2023-03-05 DOI: 10.24330/ieja.1260499
Shubham Mittal, Gaurav Mittal, R. K. Sharma
In this paper, we extend the notions of friendly and solitary numbers to group theory and define friendly and solitary groups of type-1 and type-2. We provide many examples of friendly and solitary groups and study certain properties of the type-2 friends of cyclic $p$-groups, where $p$ is a prime number.
在本文中,我们将友好和孤立数的概念推广到群论中,并定义了类型1和类型2的友好和孤立群。我们提供了许多友好群和孤立群的例子,并研究了循环$p$-群的2型友的某些性质,其中$p$是素数。
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International Electronic Journal of Algebra
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