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On lisse non-admissible minimal and principal W-algebras 关于利塞非容许最小和主 W 结构
Pub Date : 2024-08-08 DOI: arxiv-2408.04584
Tomoyuki Arakawa, Thomas Creutzig, Kazuya Kawasetsu
We discuss a possible generalization of a result by the third-named author onthe rationality of non-admissible minimal W-algebras. We then apply thisgeneralization to finding rational non-admissible principal W-algebras.
我们讨论了第三位作者关于不可容许的最小 W 结构的合理性的一个结果的可能推广。然后,我们将这一概括应用于寻找合理的不可容许主 W 轴。
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引用次数: 0
Growth Problems for Representations of Finite Groups 有限群表示的增长问题
Pub Date : 2024-08-08 DOI: arxiv-2408.04196
David He
We compute (exact and asymptotic) formulas for the growth rate of the numberof indecomposable summands in the tensor powers of representations of finitegroups, over a field of arbitrary characteristic. In characteristic zero, weobtain in addition a general exact formula for the growth rate and give acomplete solution to the growth problems in terms of the character table. Wealso provide code used to compute our formulas.
我们计算了在任意特征域上有限群表示张量幂中不可分解和数的增长率(精确和渐近)公式。在特征为零时,我们还得到了增长率的一般精确公式,并给出了用特征表解决增长问题的完整方案。我们还提供了用于计算公式的代码。
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引用次数: 0
The ring of perfect $p$-permutation bimodules for blocks with cyclic defect groups 具有循环缺陷群的块的完美 p$-permutation 双模环
Pub Date : 2024-08-08 DOI: arxiv-2408.04134
Robert Boltje, Nariel Monteiro
Let $B$ be a block algebra of a group algebra $FG$ of a finite group $G$ overa field $F$ of characteristic $p>0$. This paper studies ring theoreticproperties of the representation ring $T^Delta(B,B)$ of perfect$p$-permutation $(B,B)$-bimodules and properties of the $k$-algebra$kotimes_mathbb{Z} T^Delta(B,B)$, for a field $k$. We show that if theCartan matrix of $B$ has $1$ as an elementary divisor then $[B]$ is notprimitive in $T^Delta(B,B)$. If $B$ has cyclic defect groups we determine aprimitive decomposition of $[B]$ in $T^Delta(B,B)$. Moreover, if $k$ is afield of characteristic different from $p$ and $B$ has cyclic defect groups oforder $p^n$ we describe $kotimes_mathbb{Z} T^Delta(B,B)$ explicitly as adirect product of a matrix algebra and $n$ group algebras.
设 $B$ 是特征 $p>0$ 的域 $F$ 上有限群 $G$ 的群代数 $FG$ 的一个分块代数。本文研究完全$p$-permutation $(B,B)$双模的表示环$T^Delta(B,B)$的环论性质,以及$k$-代数$kotimes_mathbb{Z}的性质。T^Delta(B,B)$, 对于一个域 $k$.我们证明,如果 $B$ 的卡尔坦矩阵有 1$ 作为基本除数,那么 $[B]$ 在 $T^Delta(B,B)$ 中不是原始的。如果 $B$ 有循环缺陷群,我们将确定 $[B]$ 在 $T^Delta(B,B)$ 中的原始分解。此外,如果 $k$ 是不同于 $p$ 的特征域,并且 $B$ 有秩为 $p^n$ 的循环缺陷群,那么我们将描述 $kotimes_mathbb{Z}T^Delta(B,B)$ 明确地描述为矩阵代数与 $n$ 群代数的直接乘积。
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引用次数: 0
Auslander algebras, flag combinatorics and quantum flag varieties 奥氏代数、旗组合和量子旗品种
Pub Date : 2024-08-08 DOI: arxiv-2408.04753
Bernt Tore Jensen, Xiuping Su
Let $D$ be the Auslander algebra of $mathbb{C}[t]/(t^n)$, which isquasi-hereditary, and $mathcal{F}_Delta$ the subcategory of good $D$-modules.For any $mathsf{J}subseteq[1, n-1]$, we construct a subcategory$mathcal{F}_Delta(mathsf{J})$ of $mathcal{F}_Delta$ with an exactstructure $mathcal{E}$. We show that under $mathcal{E}$,$mathcal{F}_Delta(mathsf{J})$ is Frobenius stably 2-Calabi-Yau and admits acluster structure consisting of cluster tilting objects. This then leads to anadditive categorification of the cluster structure on the coordinate ring$mathbb{C}[operatorname{Fl}(mathsf{J})]$ of the (partial) flag variety$operatorname{Fl}(mathsf{J})$. We further apply $mathcal{F}_Delta(mathsf{J})$ to study flag combinatoricsand the quantum cluster structure on the flag variety$operatorname{Fl}(mathsf{J})$. We show that weak and strong separation can bedetected by the extension groups $operatorname{ext}^1(-, -)$ under$mathcal{E}$ and the extension groups $operatorname{Ext}^1(-,-)$,respectively. We give a interpretation of the quasi-commutation rules ofquantum minors and identify when the product of two quantum minors is invariantunder the bar involution. The combinatorial operations of flips and geometricexchanges correspond to certain mutations of cluster tilting objects in$mathcal{F}_Delta(mathsf{J})$. We then deduce that any (quantum) minor isreachable, when $mathsf{J}$ is an interval. Building on our result for the interval case, Geiss-Leclerc-Schr"{o}er'sresult on the quantum coordinate ring for the open cell of$operatorname{Fl}(mathsf{J})$ and Kang-Kashiwara-Kim-Oh's enhancement of thatto the integral form, we prove that$mathbb{C}_q[operatorname{Fl}(mathsf{J})]$ is a quantum cluster algebra over$mathbb{C}[q,q^{-1}]$.
让 $D$ 是$mathbb{C}[t]/(t^n)$ 的奥斯兰德代数,它是类继承的,而 $mathcal{F}_Delta$ 是好 $D$ 模块的子类。对于任意 $mathsf{J}subseteq[1, n-1]$, 我们构建了一个具有精确结构 $mathcal{E}$ 的子类$mathcal{F}_Delta(mathsf{J})$。我们证明在 $mathcal{E}$ 条件下,$mathcal{F}_Delta(mathsf{J})$ 是弗罗贝尼斯稳定的 2-Calabi-Yau 并允许由簇倾斜对象组成的簇结构。这就导致在(部分)旗变$operatorname{Fl}(mathsf{J})$ 的坐标环$mathbb{C}[operatorname{Fl}(mathsf{J})]$ 上的簇结构的附加分类。我们进一步应用 $mathcal{F}_Delta(mathsf{J})$ 来研究旗簇组合学以及旗簇$operatorname{Fl}(mathsf{J})$ 上的量子簇结构。我们证明,弱分离和强分离可以分别通过$mathcal{E}$下的扩展群$operatorname{ext}^1(-, -)$和扩展群$operatorname{Ext}^1(-,-)$来检测。我们给出了量子微分的准换向规则的解释,并确定了当两个量子微分的乘积在条形内卷下是不变的。翻转和几何交换的组合操作对应于$mathcal{F}_Delta(mathsf{J})$中簇倾斜对象的某些突变。然后我们推导出,当 $mathsf{J}$ 是一个区间时,任何(量子)小数都是可达到的。基于我们在区间情况下的结果、盖斯-勒克莱尔-施莱尔在$operatorname{Fl}(mathsf{J})$的开放单元的量子坐标环上的结果,以及康-卡什瓦拉-金-奥(Kang-Kashiwara-Kim-Oh)对积分形式的增强、我们证明$mathbb{C}_q[operatorname{Fl}(mathsf{J})]$ 是一个在$mathbb{C}[q,q^{-1}]$ 上的量子簇代数。
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引用次数: 0
On endosplit $p$-permutation resolutions and Broué's conjecture for $p$-solvable groups 关于可解 p 美元群的内裂 p 美元互变决议和布鲁厄猜想
Pub Date : 2024-08-07 DOI: arxiv-2408.04094
Sam K. Miller
Endosplit $p$-permutation resolutions play an instrumental role in verifyingBrou'{e}'s abelian defect group conjecture in numerous cases. In this article,we give a complete classification of endosplit $p$-permutation resolutions andreduce the question of Galois descent of an endosplit $p$-permutationresolution to the Galois descent of the module it resolves. This is shown usingtechniques from the study of endotrivial complexes, the invertible objects ofthe bounded homotopy category of $p$-permutation modules. As an application, weshow that a refinement of Brou'{e}'s conjecture proposed by Kessar andLinckelmann holds for all blocks of $p$-solvable groups.
内分 $p$-permutation 解析在验证布鲁(Brou/'{e})的无边际缺陷群猜想中发挥了重要作用。在本文中,我们给出了内分 $p$-permutation 解析的完整分类,并将内分 $p$-permutation 解析的伽罗瓦后裔问题简化为它所解析的模块的伽罗瓦后裔问题。我们利用研究内琐复数的技术证明了这一点,内琐复数是$p$-permutation模块的有界同调范畴的可逆对象。作为一个应用,我们证明了凯萨和林克尔曼提出的布鲁{e}猜想的细化对于$p$可解群的所有块都成立。
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引用次数: 0
Projective (or spin) representations of finite groups. II 有限群的射影(或自旋)表示。二
Pub Date : 2024-08-07 DOI: arxiv-2408.03486
Tatsuya Tsurii, Satoe Yamanaka, Itsumi Mikami, Takeshi Hirai
In the previous paper, we proposed a practical method of constructingexplicitly representation groups $R(G)$ for finite groups $G$, and apply it tocertain typical finite groups $G$ with Schur multiplier $M(G)$ containing primenumber 3. In this paper, we construct a complete list of irreducible projective(or spin) representations of $G$ and compute their characters (called spincharacters). It is a continuation of our study of spin representations in thecases where $M(G)$ contains prime number 2 to the cases where other prime $p$appears, firstly $p=3$. We classify irreducible spin representations andcalculate spin characters according to their spin types.
在上一篇论文中,我们提出了一种为有限群 $G$ 明确构造表示群 $R(G)$ 的实用方法,并将其应用于某些典型的有限群 $G$ ,其舒尔乘数 $M(G)$ 包含初数 3。在本文中,我们构建了 $G$ 不可还原的投影(或自旋)表示的完整列表,并计算了它们的字符(称为自旋字符)。这是我们在 $M(G)$ 包含素数 2 的情况下对自旋表示的研究的延续,也是其他素数 $p$ 出现的情况的延续,首先是 $p=3$。我们对不可还原自旋表示进行分类,并根据它们的自旋类型计算自旋字符。
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引用次数: 0
Lüroth's theorem for fields of rational functions in infinitely many permuted variables 无穷多周变数有理函数域的吕洛特定理
Pub Date : 2024-08-07 DOI: arxiv-2408.04028
M. Rovinsky
L"uroth's theorem describes the dominant maps from rational curves over afield. In this note we study the dominant maps from cartesian powers $X^{Psi}$ ofabsolutely irreducible varieties $X$ over a field $k$ for infinite sets $Psi$that are equivariant with respect to all permutations of the factors $X$. Atleast some of such maps arise as compositions$h:X^{Psi}xrightarrow{f^{Psi}}Y^{Psi}to Hbackslash Y^{Psi}$, where$Xxrightarrow{f}Y$ is a dominant $k$-map and $H$ is an automorphism group $H$of $Y|k$, acting diagonally on $Y^{Psi}$. In characteristic 0, we show that this construction, when properly modified,gives all dominant equivariant maps from $X^{Psi}$, if $dim X=1$. Forarbitrary $X$, the results are only partial. In a subsequent paper, the `quasicoherent' equivariant sheaves on the targetsof such $h$'s will be studied. Some preliminary results have already appearedin arXiv:math/2205.15144. A somewhat similar problem is to check, whether the irreducible invariantsubvarieties of $X^{Psi}$ arise as pullbacks under $f^{Psi}$ (for appropriate$f$'s) of subvarieties of $Y$ diagonally embedded into $Y^{Psi}$. This wouldbe a complement to the famous theorem of D.E.Cohen on the noetherian propertyof the symmetric ideals. We show that this is the case if $dim X=1$.
L"uroth 定理描述了有理曲线在一个域上的支配映射。在这篇论文中,我们研究了在一个域$k$上的绝对不可还原变种$X$的笛卡尔幂$X^{/Psi}$的主映射,这些笛卡尔幂$X^{/Psi}$的无限集$Psi$相对于因子$X$的所有排列是等变的。至少有一些这样的映射是以组合$h:X^{Psi}xrightarrow{f^{Psi}}Y^{Psi}}to Hbackslash Y^{Psi}$的形式出现的,其中$Xxrightarrow{f}Y$是一个占优的$k$映射,而$H$是$Y|k$的一个自变群$H$,对角地作用于$Y^{Psi}$。在特征为 0 的情况下,如果 $dim X=1$ ,我们将证明这种构造经过适当修改后,可以给出来自 $X^{Psi}$ 的所有主导等变映射。对于任意的 $X$,结果只是部分的。在以后的论文中,我们将研究这种 $h$'s 目标上的 "类相干 "等变剪切。一些初步结果已经出现在 arXiv:math/2205.15144 中。一个有点类似的问题是检查 $X^{Psi}$的不可还原无变量子域是否作为 $Y^{Psi}$(对于适当的 $f$'s)对角嵌入 $Y^{Psi}$ 的子域的 $f^{Psi}$ 下的回拉而出现。这将是对科恩(D.E.Cohen)关于对称ideal的noetherian性质的著名定理的补充。我们证明,如果 $dim X=1$ 时,情况就是这样。
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引用次数: 0
$τ$-cluster morphism categories of factor algebras 因子代数的τ$-簇形态类别
Pub Date : 2024-08-07 DOI: arxiv-2408.03818
Maximilian Kaipel
We take a novel lattice-theoretic approach to the $tau$-cluster morphismcategory $mathfrak{T}(A)$ of a finite-dimensional algebra $A$ and define thecategory via the lattice of torsion classes $mathrm{tors } A$. Using thelattice congruence induced by an ideal $I$ of $A$ we establish a functor $F_I:mathfrak{T}(A) to mathfrak{T}(A/I)$ and if $mathrm{tors } A$ is finite aninclusion $mathcal{I}: mathfrak{T}(A/I) to mathfrak{T}(A)$. We characterisewhen these functors are full, faithful and adjoint. As a consequence we find anew family of algebras for which $mathfrak{T}(A)$ admits a faithful groupfunctor.
我们对有限维代数 $A$ 的 $tau$ 簇形态范畴 $mathfrak{T}(A)$ 采用了一种新颖的晶格理论方法,并通过扭转类的晶格 $mathrm{tors } 来定义该范畴。A$.利用由 $A$ 的理想 $I$ 引起的晶格全等,我们建立了一个函子 $F_I:mathfrak{T}(A) to mathfrak{T}(A/I)$ ,如果 $mathrm{tors } A$ 是有限的,那么这个函子就是 $F_I:mathfrak{T}(A) to mathfrak{T}(A/I)$ 。A$ 是有限包含 $mathcal{I}:到 mathfrak{T}(A/I)$。我们将描述这些函数是全函数、忠实函数和邻接函数时的特征。因此,我们发现了一个新的代数家族,对于这个家族,$mathfrak{T}(A)$ 允许一个忠实的群函数。
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引用次数: 0
Log-concavity of cluster algebras of type $A_n$ A_n$ 型群集代数的对数凹性
Pub Date : 2024-08-07 DOI: arxiv-2408.03792
Zhichao Chen, Guanhua Huang, Zhe Sun
After Gross, Hacking, Keel, Kontsevich [GHKK18] introduced the theta basiswhich is shown to be indexed by its highest term exponent in cluster variablesof any given seed, we are interested in all the non-vanishing exponents inthese cluster variables. We prove that the coefficients of the exponents of anycluster variable of type $A_n$ are log-concave. We show that the clustermonomials of $A_2$ type are log-concave. As for larger generality, weconjecture that the log-concavity of cluster monomials is also true.
在格罗斯、哈金、基尔和康采维奇[GHKK18]介绍了θ基之后,我们对这些簇变量中所有不相等的指数感兴趣。我们证明,任何 $A_n$ 类型的聚类变量的指数系数都是对数凹的。我们证明了 $A_2$ 类型的聚类自治变量是对数凹的。至于更大的一般性,我们猜想簇单项式的对数凹性也是真的。
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引用次数: 0
Quasi-biserial algebras, special quasi-biserial algebras and labeled Brauer graph algebras 准双星代数、特殊准双星代数和标注布劳尔图代数
Pub Date : 2024-08-07 DOI: arxiv-2408.03778
Yuming Liu, Bohan Xing
In this paper, we define and study quasi-biserial algebras, specialquasi-biserial algebras and labeled Brauer graph algebras. These algebrasnaturally generalize biserial and special biserial algebras to algebras of wildrepresentation type, in a different direction of multiserial and specialmultiserial algebras. We show that all special quasi-biserial algebras arequasi-biserial, all special quasi-biserial algebras are quotients of symmetricspecial quasi-biserial algebras and all symmetric special quasi-biserialalgebras are labeled Brauer graph algebras. Moreover, we show that the labeledBrauer graph algebras are derived equivalent under Kauer moves.
在本文中,我们定义并研究了准双列代数、特准双列代数和标注布劳尔图代数。这些数论自然地将双贝塞尔数论和特殊双贝塞尔数论泛化为野生表示类型的数论,与多贝塞尔数论和特殊多贝塞尔数论的方向不同。我们证明了所有特殊准双列代数都是准双列的,所有特殊准双列代数都是对称特殊准双列代数的商,所有对称特殊准双列代数都是带标记的布劳尔图代数。此外,我们还证明了带标记的布劳尔图代数在考尔移动下是派生等价的。
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引用次数: 0
期刊
arXiv - MATH - Representation Theory
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