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On multidimensional Schur rings of finite groups 有限群的多维Schur环
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2023-02-02 DOI: 10.1515/jgth-2023-0032
Gang Chen, Qingchun Ren, Ilia N. Ponomarenko
Abstract For any finite group 𝐺 and a positive integer 𝑚, we define and study a Schur ring over the direct power G m G^{m} , which gives an algebraic interpretation of the partition of G m G^{m} obtained by the 𝑚-dimensional Weisfeiler–Leman algorithm. It is proved that this ring determines the group 𝐺 up to isomorphism if m ≥ 3 mgeq 3 , and approaches the Schur ring associated with the group Aut ⁡ ( G ) operatorname{Aut}(G) acting on G m G^{m} naturally if 𝑚 increases. It turns out that the problem of finding this limit ring is polynomial-time equivalent to the group isomorphism problem.
摘要对于任意有限群𝐺和正整数𝑚,我们定义并研究了G m G^{m}上的直接幂上的Schur环,给出了用𝑚-dimensional Weisfeiler-Leman算法得到的G {m G^m}的划分的代数解释。证明了当m≥3m geq 3时,此环决定了群𝐺达到同构;当𝑚增大时,此环接近于与群Aut (G) operatorname{Aut} (G)相关联的舒尔环,该群作用于G {m G^m}。结果表明,寻找这个极限环的问题与群同构问题是多项式时间等价的。
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引用次数: 1
The R ∞ R_{infty} property for nilpotent quotients of Generalized Solvable Baumslag–Solitar groups 广义可解baumslag -孤子群幂零商的R∞R_ {infty}性质
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2023-01-31 DOI: 10.1515/jgth-2022-0129
Wagner C. Sgobbi, Da Silva, D. Vendrúscolo
Abstract We say a group 𝐺 has property R ∞ R_{infty} if the number R ⁢ ( φ ) R(varphi) of twisted conjugacy classes is infinite for every automorphism 𝜑 of 𝐺. For such groups, the R ∞ R_{infty} -nilpotency degree is the least integer 𝑐 such that G / γ c + 1 ⁢ ( G ) G/gamma_{c+1}(G) has property R ∞ R_{infty} . In this work, we compute the R ∞ R_{infty} -nilpotency degree of all Generalized Solvable Baumslag–Solitar groups Γ n Gamma_{n} . Moreover, we compute the lower central series of Γ n Gamma_{n} , write the nilpotent quotients Γ n , c = Γ n / γ c + 1 ⁢ ( Γ n ) Gamma_{n,c}=Gamma_{n}/gamma_{c+1}(Gamma_{n}) as semidirect products of finitely generated abelian groups and classify which invertible integer matrices can be extended to automorphisms of Γ n , c Gamma_{n,c} .
摘要:对于𝐺的每一个自同构域中,如果扭曲共轭类的个数R¹(φ) R(varphi)是无限的,则群𝐺具有R∞R_ {infty}的性质。对于这样的群,R∞R_ {infty} -幂零度是最小的整数𝑐,使得G/ γ c + 1¹(G) G/ gamma _ {c+1} (G)具有R∞R_ {infty}的性质。在这项工作中,我们计算了所有广义可解Baumslag-Solitar群Γ n Gamma _ 的R∞R_ {infty} -幂零度。此外,我们计算了Γ n的下中心级数{}Gamma _ {n},将幂零商Γ n, c = Γ n / Γ c + 1 (Γ n) Gamma _ {n,c} = Gamma _ {n} / gamma _ {c+1} (Gamma _ {n})作为有限生成的阿贝群的半直积,并对可逆整数矩阵可扩展为Γ n的自同态进行了分类。C Gamma _ {n,c}。
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引用次数: 0
Curvature distribution and hyperbolicity 曲率分布和双曲性
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2023-01-17 DOI: 10.1515/jgth-2022-0106
C. Chalk, M. Edjvet
Abstract We describe a method, based on curvature distribution techniques on van Kampen diagrams, for proving finitely presented groups hyperbolic. We apply our method and show that the generalised Fibonacci group F ⁢ ( r , n ) F(r,n) is hyperbolic when r ≥ 3 rgeq 3 and n ≥ 6 ⁢ r + 1 ngeq 6r+1 and determine which of the groups F ⁢ ( 3 , n ) F(3,n) are hyperbolic.
摘要本文描述了一种基于van Kampen图上曲率分布技术的证明有限表示群双曲型的方法。我们应用我们的方法,证明了广义Fibonacci群F(r,n) F(r,n)是双曲的,当r≥3r geq 3和n≥6 (r + 1n geq 6r+1),并确定了哪些群F(3,n)是双曲的。
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引用次数: 0
On generations by conjugate elements in almost simple groups with socle 2𝐹4(𝑞2)′ 近似单群共轭元的代论(2)𝐹4(𝑞2)
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2022-12-28 DOI: 10.1515/jgth-2022-0216
D. Revin, A. Zavarnitsine
Abstract We prove that if L = F 4 2 ⁢ ( 2 2 ⁢ n + 1 ) ′ L={}^{2}F_{4}(2^{2n+1})^{prime} and 𝑥 is a nonidentity automorphism of 𝐿, then G = ⟨ L , x ⟩ G=langle L,xrangle has four elements conjugate to 𝑥 that generate 𝐺. This result is used to study the following conjecture about the 𝜋-radical of a finite group. Let 𝜋 be a proper subset of the set of all primes and let 𝑟 be the least prime not belonging to 𝜋. Set m = r m=r if r = 2 r=2 or 3 and m = r − 1 m=r-1 if r ⩾ 5 rgeqslant 5 . Supposedly, an element 𝑥 of a finite group 𝐺 is contained in the 𝜋-radical O π ⁡ ( G ) operatorname{O}_{pi}(G) if and only if every 𝑚 conjugates of 𝑥 generate a 𝜋-subgroup. Based on the results of this and previous papers, the conjecture is confirmed for all finite groups whose every nonabelian composition factor is isomorphic to a sporadic, alternating, linear, unitary simple group, or to one of the groups of type B 2 2 ⁢ ( 2 2 ⁢ n + 1 ) {}^{2}B_{2}(2^{2n+1}) , G 2 2 ⁢ ( 3 2 ⁢ n + 1 ) {}^{2}G_{2}(3^{2n+1}) , F 4 2 ⁢ ( 2 2 ⁢ n + 1 ) ′ {}^{2}F_{4}(2^{2n+1})^{prime} , G 2 ⁢ ( q ) G_{2}(q) , or D 4 3 ⁢ ( q ) {}^{3}D_{4}(q) .
摘要证明了若L= F 4 2 (22 2 n + 1) ' L={}^{2}f_{4}(2^{2n+1})^{prime} 并且s1是𝐿的非恒等自同构,则G=⟨L, x⟩G=langle L,xrangle 有四个元素共轭到1,生成𝐺。利用这一结果研究了有限群的𝜋-radical的猜想。设0是所有素数集合的一个固有子集,设𝑟是不属于0的最小素数。设m=r,如果r=2,则设m=r,如果r=2或3,则设m=r−1,如果r小于5 r,则设m=r = 1geqslant 5 . 假设,一个有限群𝐺的元素≥1包含在𝜋-radical O π (G) operatorname{O}_{pi}(G)当且仅当所有的𝑚共轭式都产生𝜋-subgroup。基于本论文和前几篇论文的结果,对于所有非贝尔组成因子同构于一个偶发的、交替的、线性的、酉的单群或B型群中的一个22²(22²²n + 1)的有限群,证实了这个猜想。 {}^{2}b……{2}(2^{2n+1}), g22减去(32减去n + 1) {}^{2}g_{2}(3^{2n+1}), f42减去(22减去n + 1) {}^{2}f_{4}(2^{2n+1})^{prime} , g2∑(q) G_{2}(q)或者d43∑(q) {}^{3.}d_{4}(q)。
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引用次数: 0
A bound for the orders of centralizers of irreducible subgroups of algebraic groups 代数群的不可约子群的中心器阶的界
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2022-12-07 DOI: 10.1515/jgth-2022-0111
M. Liebeck
Abstract We prove that if 𝐺 is a connected semisimple algebraic group of rank 𝑟, and 𝐻 is a subgroup of 𝐺 that is contained in no proper parabolic subgroup, then we have | C G ⁢ ( H ) | < c r ⁢ | Z ⁢ ( G ) | lvert C_{G}(H)rvert
摘要证明了如果𝐺是一个秩为𝑟的连通半简单代数群,且𝐻是𝐺的一个子群,且该子群不包含真抛物子群,则有| C G¹(H) | < C r¹| Z¹(G) | lvert c_{g}(h)rvert
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引用次数: 1
A classification of skew morphisms of dihedral groups 二面体群的偏斜态射分类
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2022-11-16 DOI: 10.1515/jgth-2022-0085
Kan Hu, I. Kovács, Young Soo Kwon
Abstract A skew morphism of a finite group 𝐴 is a permutation 𝜑 of 𝐴 fixing the identity element and for which there is an integer-valued function 𝜋 on 𝐴 such that φ ⁢ ( x ⁢ y ) = φ ⁢ ( x ) ⁢ φ π ⁢ ( x ) ⁢ ( y ) varphi(xy)=varphi(x)varphi^{pi(x)}(y) for all x , y ∈ A x,yin A . In this paper, we restrict ourselves to the case when A = D n A=D_{n} , the dihedral group of order 2 ⁢ n 2n . Wang et al. [Smooth skew morphisms of dihedral groups, Ars Math. Contemp. 16 (2019), 2, 527–547] determined all 𝜑 under the condition that π ( φ ( x ) ) ≡ π ( x ) ( mod | φ | ) ) pi(varphi(x))equivpi(x)pmod{lvertvarphirvert}) holds for every x ∈ D n xin D_{n} , and later Kovács and Kwon [Regular Cayley maps for dihedral groups, J. Combin. Theory Ser. B 148 (2021), 84–124] characterised those 𝜑 such that there exists an inverse-closed ⟨ φ ⟩ langlevarphirangle -orbit, which generates D n D_{n} . We show that these two types of skew morphisms comprise all skew morphisms of D n D_{n} . The result is used to classify the finite groups with a complementary factorisation into a dihedral and a core-free cyclic subgroup. As another application, a formula for the total number of skew morphisms of D p t D_{p^{t}} is also derived for any prime 𝑝.
摘要有限群的偏态射是一个固定单位元的变量的置换,对于这个置换,存在一个整数值函数,使得对于A x,y in A, φ∞(x) y = φ∞(x)∞(x)∞(x)∞(y) varphi (xy)= varphi (x) varphi{ ^ }{pi} (x)(y)。在本文中,我们限制了当A= dn A={D_n}, 2次方n 2n的二面体群。Wang et al.[二面体群的光滑倾斜态射,数学学报。]当代16(2019),2,527 - 547]在π (φ (x))≡π (x) (mod | φ |) pi (varphi (x)) equivpi (x) pmod{lvertvarphirvert})对每个x∈dn x in D_n{成立的条件下确定了所有的变量,后来Kovács和Kwon[二面体群的正则Cayley映射,J. Combin]。理论SerB 148(2021), 84-124]表征了那些变量,使得存在一个反封闭的⟨φ⟩}langlevarphirangle -轨道,它产生了dn {D_n}。我们证明了这两种类型的倾斜态射包含了{dnd_n}的所有倾斜态射。利用这一结果将具有互补分解的有限群划分为二面体和无核循环子群。作为另一个应用,对于{任意素数𝑝,也导出了{pdtd_p ^}}t的偏态射总数的公式。
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引用次数: 5
Diagonal embeddings of finite alternating groups 有限交替群的对角嵌入
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2022-11-15 DOI: 10.1515/jgth-2022-0059
S. Thomas
Abstract We will present an alternative approach to Zalesskiĭ’s theorem on diagonal embeddings of finite alternating groups.
摘要本文将给出zalesski’s关于有限交替群对角嵌入定理的一种替代方法。
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引用次数: 0
Conjugacy classes of maximal cyclic subgroups of metacyclic 𝑝-groups 亚环的极大环子群的共轭类𝑝-groups
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2022-10-15 DOI: 10.1515/jgth-2022-0103
M. Bianchi, R. Camina, M. Lewis
Abstract In this paper, we set η ⁢ ( G ) eta(G) to be the number of conjugacy classes of maximal cyclic subgroups of a finite group 𝐺. We compute η ⁢ ( G ) eta(G) for all metacyclic 𝑝-groups. We show that if 𝐺 is a metacyclic 𝑝-group of order p n p^{n} that is not dihedral, generalized quaternion, or semi-dihedral, then η ⁢ ( G ) ≥ n - 2 eta(G)geq n-2 , and we determine when equality holds.
摘要:本文设η (G) eta (G)为有限群𝐺的极大循环子群的共轭类的个数。我们计算所有元环𝑝-groups的η∑(G) eta (G)。我们证明了如果𝐺是p n p^{n}阶的元环𝑝-group,它不是二面体、广义四元数或半二面体,则η∑(G)≥n-2 eta (G) geq n-2,并确定了等式在什么时候成立。
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引用次数: 0
The average character degree of finite groups and Gluck’s conjecture 有限群的平均特征度与Gluck猜想
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2022-09-19 DOI: 10.1515/jgth-2022-0120
Alexander Moret'o
Abstract We prove that the order of a finite group 𝐺 with trivial solvable radical is bounded above in terms of acd ⁡ ( G ) operatorname{acd}(G) , the average degree of the irreducible characters. It is not true that the index of the Fitting subgroup is bounded above in terms of acd ⁡ ( G ) operatorname{acd}(G) , but we show that, in certain cases, it is bounded in terms of the degrees of the irreducible characters of 𝐺 that lie over a linear character of the Fitting subgroup. This leads us to propose a refined version of Gluck’s conjecture.
摘要证明了一类具有平凡可解根的有限群𝐺的阶是由不可约字符的平均次,即acd (G) 算子名{acd}(G)有界的。拟合子群的索引不是真的在上面以add (G) 算子名{add}(G)有界,但我们证明,在某些情况下,它是以位于拟合子群的线性特征上的𝐺的不可约字符的度有界。这让我们提出了格拉克猜想的一个改进版本。
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引用次数: 1
Character degrees of normally monomial 𝑝-groups of maximal class 极大类正常单项𝑝-groups的特征度
IF 0.5 3区 数学 Q3 Mathematics Pub Date : 2022-09-12 DOI: 10.1515/jgth-2021-0212
Dongfang Yang, Heng Lv
Abstract A finite group 𝐺 is normally monomial if all its irreducible characters are induced from linear characters of normal subgroups of 𝐺. In this paper, we study the largest irreducible character degree and the maximal abelian normal subgroup of normally monomial 𝑝-groups of maximal class in terms of 𝑝. In particular, we determine all possible irreducible character degree sets of normally monomial 5-groups of maximal class.
如果一个有限群𝐺的所有不可约性质均由其正规子群𝐺的线性性质导出,则该群为正规单项式群。本文研究了关于𝑝的极大类的正态单项𝑝-groups的最大不可约特征度和极大阿贝尔正规子群。特别地,我们确定了极大类的正常单项式5群的所有可能的不可约特征度集。
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引用次数: 0
期刊
Journal of Group Theory
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