Joshua Bardwell, Dominic Searles
We construct modules of the $0$-Hecke algebra whose images under the quasisymmetric characteristic map are the Young row-strict quasisymmetric Schur functions. This provides a representation-theoretic interpretation of this basis of quasisymmetric functions, answering a question of Mason and Niese (2015). Additionally, we classify when these modules are indecomposable.
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Recently Tewari and van Willigenburg constructed modules of the 0-Hecke algebra that are mapped to the quasisymmetric Schur functions by the quasisymmetric characteristic and decomposed them into a direct sum of certain submodules. We show that these submodules are indecomposable by determining their endomorphism rings.
We begin by deriving an action of the 0-Hecke algebra on standard reverse composition tableaux and use it to discover 0-Hecke modules whose quasisymmetric characteristics are the natural refinements of Schur functions known as quasisymmetric Schur functions. Furthermore, we classify combinatorially which of these 0-Hecke modules are indecomposable. From here, we establish that the natural equivalence relation arising from our 0-Hecke action has equivalence classes that are isomorphic to subintervals of the weak Bruhat order on the symmetric group. Focussing on the equivalence classes containin…
Quasisymmetric Schur $Q$-functions and peak Young quasisymmetric Schur functions
本文探讨拟对称Schur $Q$-函数与峰值杨拟对称Schur函数的关系，通过引入双射结合算法证明过渡矩阵性质，给出钩长公式等组合性质，明确特定情况下的展开式。
Distinguished filtrations of the $0$-Hecke modules for dual immaculate quasisymmetric functions
本文证明对偶无瑕拟对称函数对应的不可分解$0$-Hecke模在Young拟对称Schur函数基下具有区分滤过，并利用Mason的RSK类比构造了新的不可分解模，给出正展开的表示论解释。
We introduce a general method for constructing modules for $0$-Hecke algebras and supermodules for $0$-Hecke-Clifford algebras from diagrams of boxes in the plane, and give formulas for the images of these modules in the algebras of quasisymmetric functions and peak functions under the relevant characteristic map. As initial applications, we resolve a question of Jing and Li (2015), introduce a new basis of the peak algebra analogous to the quasisymmetric Schur functions, uncover a new connection between Schur $Q$-functions and quasisymmetric Schur functions, give a representation-theoretic in…
The extended Schur functions form a basis of quasisymmetric functions that contains the Schur functions. We provide a representation-theoretic interpretation of this basis by constructing $0$-Hecke modules whose quasisymmetric characteristics are the extended Schur functions. We further prove these modules are indecomposable.
0-Hecke Modules, Domino Tableaux, and Type-$B$ Quasisymmetric Functions
本文将升序相容推广至所有 Coxeter 群以构造 0-Hecke 模，并在 B 型中解释拟对称、峰函数及移位多米诺函数，证明正展开与限制特征公式。
Let $n$ be a nonnegative integer. For each composition $α$ of $n$, Berg $\textit{et al.}$ introduced a cyclic indecomposable $H_n(0)$-module $\mathcal{V}_α$ with a dual immaculate quasisymmetric function as the image of the quasisymmetric characteristic. In this paper, we study $\mathcal{V}_α$'s from the homological viewpoint. To be precise, we construct a minimal projective presentation of $\mathcal{V}_α$ and a minimal injective presentation of $\mathcal{V}_α$ as well. Using them, we compute ${\rm Ext}^1_{H_n(0)}(\mathcal{V}_α, {\bf F}_β)$ and ${\rm Ext}^1_{H_n(0)}( {\bf F}_β, \mathcal{V}_α)$…
The purpose of this paper is to provide a unified method for dealing with various 0-Hecke modules constructed using tableaux so far. To do this, we assign a $0$-Hecke module to each left weak Bruhat interval, called a weak Bruhat interval module. We prove that every indecomposable summand of the $0$-Hecke modules categorifying dual immaculate quasisymmetric functions, extended Schur functions, quasisymmetric Schur functions, and Young row-strict quasisymmetric Schur functions is a weak Bruhat interval module. We further study embedding into the regular representation, induction product, restri…
Generalised hook lengths and Schur elements for Hecke algebras
本研究比较分拆钩长的两种推广，应用于Ariki-Koike代数模表示论，证明单模Schur元可被其广义核的Schur元整除，且A型Hecke代数下该值等于核与商的Schur元乘积。
Contractions and applications of crystal skeletons: Young quasisymmetric and Stanley symmetric functions
研究晶体骨架相关内容，通过收缩准晶体得到晶体骨架并将其进一步平铺为准晶体骨架，刻画了相关边，收缩准晶体骨架组件产生布劳威尔序，还通过分析斯坦利对称函数展示了这些工具在对称函数中的应用。
Poset modules of the $0$-Hecke algebras and related quasisymmetric power sum expansions
本文研究0-Hecke代数的偏序集模，证明相关Grothendieck群的直和具有拟对称函数Hopf代数结构，还分析Schur函数拟类似物的拟对称幂和展开，给出新算法并通过边界条表表示对偶无污函数等的展开系数。
q-rook monoid algebras, Hecke algebras and Schur-Weyl duality
The representation theory of 0-Hecke-Clifford algebras as a degenerate case is not semisimple and also with rich combinatorial meaning. Bergeron et al. have proved that the Grothendieck ring of the category of finitely generated supermodules of 0-Hecke-Clifford algebras is isomorphic to the algebra of peak quasisymmetric functions defined by Stembridge. In this paper we further study the category of finitely generated projective supermodules and clarify the correspondence between it and the peak algebra of symmetric groups. In particular, two kinds of restriction rules for induced projective s…
This article introduces the duplex Hecke algebra, which is an infinite dimensional algebra generated by two Hecke algebras. This concept originates from the degenerate duplex Hecke algebra in the theory of Schur-Weyl duality related to enhanced reductive algebraic groups. We will study the finite dimensional natural representation of the duplex Hecke algebra on tensor space and prove that the duplex Hecke algebra forms a duality with the Levi type quantum group.
Regular Schur labeled skew shape posets and their 0-Hecke modules
该研究在Stanley的$P$-分拆猜想假设下，刻画了正则Schur标记斜形状偏序集的性质，分类其线性扩张集合与相关0-Hecke模，并构造了模关于Schur基的特异滤过。
By considering type B analogs of permutations and tableaux, we extend abstract dual equivalence to type B in two directions. In one direction, we define involutions on signed permutations and shifted tableaux that give a weak dual equivalence, thereby giving another proof of the Schur positivity of Schur Q- and P-functions. In another direction, we define an abstract shifted dual equivalence parallel to dual equivalence and prove that it can be used to establish Schur P-positivity of a function expressed as a sum of shifted fundamental quasisymmetric functions.
We study the Schur elements and the a-function for cyclotomic Hecke algebras. As a consequence, we show the existence of canonical basic sets, as defined by Geck-Rouquier, for certain complex reflection groups. This includes the case of finite Weyl groups for all choices of parameters (in characteristic 0).
We prove that the double affine Hecke algebra of type A is Morita equivalent to the quantized affine Schur algebra.
A 0-Hecke algebra is a deformation of the group algebra of a Coxeter group. Based on work of Norton and Krob--Thibon, we introduce a tableau approach to the representation theory of 0-Hecke algebras of type A, which resembles the classic approach to the representation theory of symmetric groups by Young tableaux and tabloids. We extend this approach to type B and D, and obtain a correspondence between the representation theory of 0-Hecke algebras of type B and D and quasisymmetric functions and noncommutative symmetric functions of type B and D. Other applications are also provided.
0-Hecke modules for row-strict dual immaculate functions
本研究引入拟对称函数新基行严格对偶无瑕函数，构造其循环不可分解0-Hecke模，借助偏序集明确对合ψ的模作用，揭示相关子模与商模，完整给出表生成函数变体对应0-Hecke模特征标的组合与表示论结论。
A representation-theoretic interpretation of the Schur expansion of two-row genomic Schur functions
本文通过0-Hecke模块验证了Kim和Yoo的猜想，为二维基因Schur函数的Schur展开提供了表示论解释。
After establishing a geometric Schur-Weyl duality in a general setting, we recall this duality in type A in the finite and affine case. We extend the duality in the affine case to positive parts of the affine algebras. The positive parts have nice ideals coming from geometry, allowing duality for quotients. Some of the quotients of the positive affine Hecke algebra are then identified to some cyclotomic Hecke algebras and the geometric setting allows the construction of canonical bases.
Bicolored Eulerian quasisymmetric functions, affine lengths, and Theta operators
该研究引入双色欧拉拟对称函数的q-模拟，通过对齐、交叉概念及双射描述其精细化形式，借助Theta算子证明其对称性，并基于Theta不变量猜想推导其舒尔正性。
In this paper, we introduce the sign q-permutation representation of the Iwahori-Hecke algebra on the tensor space of the graded vector space. We establish Schur-Weyl reciprocity between the quantum general super Lie algebra and the Iwahori-Hecke algebra. Our result includes Schur-Weyl reciprocity of both the super case and the quantum case, and unifies those two important cases.
Weak Bruhat interval modules of the 0-Hecke algebras for stable Grothendieck polynomials
本文针对稳定 Grothendieck 多项式的齐次分量，用标准集值杨表定义 0-Hecke 代数模，证明其拟对称特征等于该分量，并分解为弱 Bruhat 区间模的直和。
We define a higher level version of the affine Hecke algebra and prove that, after completion, this algebra is isomorphic to a completion of Webster's tensor product algebra of type A. We then introduce a higher level version of the affine Schur algebra and establish, again after completion, an isomorphism with the quiver Schur algebra. An important observation is that the higher level affine Schur algebra surjects to the Dipper-James-Mathas cyclotomic q-Schur algebra. Moreover, we give nice diagrammatic presentations for all the algebras introduced in this paper.
This paper classifies the blocks of the cyclotomic Hecke algebras of type G(r,1,n) over an arbitrary field. Rather than working with the Hecke algebras directly we work instead with the cyclotomic Schur algebras. The advantage of these algebras is that the cyclotomic Jantzen sum formula gives an easy combinatorial characterization of the blocks of the cyclotomic Schur algebras. We obtain an explicit description of the blocks by analyzing the combinatorics of `Jantzen equivalence'. We remark that a proof of the classification of the blocks of the cyclotomic Hecke algebras was announced in 1999.…
For any algebra $A$ over an algebraically closed field $\mathbb{F}$, we say that an $A$-module $M$ is Schurian if $\mathrm{End}_A(M) \cong \mathbb{F}$. We say that $A$ is Schurian-finite if there are only finitely many isomorphism classes of Schurian $A$-modules, and Schurian-infinite otherwise. In this paper, we build on the work of Ariki and the second author to show that all blocks of type $A$ Hecke algebras of weight at least $2$ in quantum characteristic $e \geq 3$ are Schurian-infinite. This proves that if $e \geq 3$ then blocks of type $A$ Hecke algebras are Schurian-finite if and only …
Following the generalization of the notion of families of characters, defined by Lusztig for Weyl groups, to the case of complex reflection groups, thanks to the definition given by Rouquier, we show that the degree and the valuation of the Schur elements (functions A and a) remain constant on the "families" of the cyclotomic Hecke algebras of the exceptional complex reflection groups. The same result has already been obtained for the groups of the infinite series and for some special cases of exceptional groups.
Weak Bruhat interval modules for genomic Schur functions
本文通过定义递增无间隙表上的 $H_m(0)$-作用构造基因组 Schur 函数齐次分量对应的模，并借助置换指派将其分解为弱 Bruhat 区间模的直和，进而确定各直和项的投射覆盖。
The paper uses the cellular basis of the (semi-simple) degenerate cyclotomic Hecke algebras to investigate these algebras exhaustively. As a consequence, we describe explicitly the "Young's seminormal form" and a orthogonal bases for Specht modules and determine explicitly the closed formula for the natural bilinear form on Specht modules and Schur elements for the degenerate cyclotomic Hekce algebras.
We use crystals of tableaux and descent compositions to understand the decomposition of Schur functions $s_λ$ into Gessel's fundamental quasisymmetric functions $F_α$. The connected crystal of tableaux $B(λ)$, associated to $s_λ$, is shown to be partitionned into a disjoint union of connected induced subgraphs $B(T_α)$ corresponding to the $F_α$'s. We show that these subgraphs, which we call quasicrystals, are isomorphic (as graphs) to specific crystals of tableaux. This allows us to give a formula for the number of tableaux of shape $λ$ and maximal entry $n$. We also use this setting to give …
We define an action of the 0-Hecke algebra of type A on the Stanley-Reisner ring of the Boolean algebra. By studying this action we obtain a family of multivariate noncommutative symmetric functions, which specialize to the noncommutative Hall-Littlewood symmetric functions and their (q,t)-analogues introduced by Bergeron and Zabrocki, and to a more general family of noncommutative symmetric functions having parameters associated with paths in binary trees introduced recently by Lascoux, Novelli, and Thibon. We also obtain multivariate quasisymmetric function identities, which specialize to re…
Poset modules of the $0$-Hecke algebras of type $B$
本文研究了类型B的0-Hecke代数的Poset模，通过定义和分析相关范畴的Grothendieck群同构于拟对称函数空间，并探讨了区分Poset与弱Bruhat区间模的关系。
Kazhdan-Lusztig bases of parabolic Hecke algebras and applications to Schur-Weyl duality
本文研究了抛物Hecke代数的Kazhdan-Lusztig基及其在Schur-Weyl双曲面中的应用，包括不可约表示的分类和核的构造。
Schurian-finiteness of blocks of type B Hecke algebras
本文研究了类型B Hecke代数块的Schurian有限性，确定了非积分情况下的所有块和积分情况下的大部分块的有限性，剩余情况通过分解数和表示论方法进行分析。
This paper gives a Schur-Weyl duality approach to the representation theory of the affine Hecke algebras of type C with unequal parameters. The first step is to realize the affine braid group of type $C_k$ as the group of braids on $k$ strands with two poles. Generalizing familiar methods from the one pole (type A) case, this provides commuting actions of the quantum group $U_q\mathfrak{g}$ and the affine braid group of type $C_k$ on a tensor space $M\otimes N \otimes V^{\otimes k}$. Special cases provide Schur-Weyl pairings between the affine Hecke algebra of type $C_k$ and the quantum group …
Trace forms on the cyclotomic Hecke algebras and cocenters of the cyclotomic Schur algebras
本文在A型分圆Hecke代数上定义了统一的迹型，并构造了双基及分圆Schur代数余中心的显式基，证明其维数与基域、Hecke参数及分圆参数无关。
For irreducible characters $\{ χ_q^λ\,|\, λ\vdash n \}$, induced sign characters $\{ ε_q^λ\,|\, λ\vdash n \}$, and induced trivial characters $\{ η_q^λ\,|\, λ\vdash n \}$ of the Hecke algebra $H_n(q)$, and Kazhdan-Lusztig basis elements $C'_w(q)$ with $w$ avoiding the patterns 3412 and 4231, we combinatorially interpret the polynomials $χ_q^λ(q^{l(w)/2}C'_w(q))$, $ε_q^λ(q^{l(w)/2} C'_w(q))$, and $\smash{η_q^λ(q^{l(w)/2} C'_w(q))}$. This gives a new algebraic interpretation of chromatic quasisymmetric functions of Shareshian and Wachs, and a new combinatorial interpretation of special cases of …
Mirabolic Hecke algebras, Schur-Weyl duality and Frobenius character formulas
本文研究了偏微分Hecke代数的新的呈现方式，建立了其与量子群之间的Schur-Weyl对偶性，并推导出Frobenius特征公式及递归的Murnaghan-Nakayama规则。
Given a module $M$ for the algebra $\mathcal{D}_{\mathtt{q}}(G)$ of quantum differential operators on $G$, and a positive integer $n$, we may equip the space $F_n^G(M)$ of invariant tensors in $V^{\otimes n}\otimes M$, with an action of the double affine Hecke algebra of type $A_{n-1}$. Here $G= SL_N$ or $GL_N$, and $V$ is the $N$-dimensional defining representation of $G$. In this paper we take $M$ to be the basic $\mathcal{D}_{\mathtt{q}}(G)$-module, i.e. the quantized coordinate algebra $M= \mathcal{O}_{\mathtt{q}}(G)$. We describe a weight basis for $F_n^G(\mathcal{O}_{\mathtt{q}}(G))$ com…
We define a new product on orbits of pairs of flags in a vector space, using open orbits in certain varieties of pairs of flags. This new product defines an associative $\mathbb{Z}$-algebra, denoted by $G(n,r)$. We show that $G(n,r)$ is a geometric realisation of the 0-Schur algebra $S_0(n, r)$ over $\mathbb{Z}$, which is the $q$-Schur algebra $S_q(n,r)$ at q=0. We view a pair of flags as a pair of projective resolutions for a quiver of type $\mathbb{A}$ with linear orientation, and study $q$-Schur algebras from this point of view. This allows us to understand the relation between $q$-Schur al…
We study the $H_n(0)$-module $\mathbf{S}^σ_α$ due to Tewari and van Willigenburg, which was constructed using new combinatorial objects called standard permuted composition tableaux and decomposed into cyclic submodules. First, we show that every direct summand appearing in their decomposition is indecomposable and characterize when $\mathbf{S}^σ_α$ is indecomposable. Second, we find characteristic relations among $\mathbf{S}^σ_α$'s and expand the image of $\mathbf{S}^σ_α$ under the quasi characteristic in terms of quasisymmetric Schur functions. Finally, we show that the canonical submodule o…
An enhanced algebraic group $\uG$ of $G=\GL(V)$ over $\bbc$ is a product variety $\GL(V)\times V$, endowed with an enhanced cross product. Associated with a natural tensor representation of $\uG$, there are naturally Levi and parabolic Schur algebras $\mathcal{L}$ and $\mathcal{P}$ respectively. We precisely investigate their structures, and study the dualities on the enhanced tensor representations for variant groups and algebras. In this course, an algebraic model of so-called degenerate double Hecke algebras (DDHA) is produced, and becomes a powerful implement. The connection between $\math…
A basis and Schur-Weyl duality for the loop Hecke algebra
本文在温和参数条件下给出环路Hecke代数的新表示和一组基，用高阶线性重写理论与Dyck路径组合证明基的线性无关性并计算其基数，从而证明Damiani-Martin-Rowell猜想，并建立其与量子gl(1|1)负半部分的Schur-Weyl对偶解释。
We introduce an affine Schur algebra via the affine Hecke algebra associated to Weyl group of affine type C. We establish multiplication formulas on the affine Hecke algebra and affine Schur algebra. Then we construct monomial bases and canonical bases for the affine Schur algebra. The multiplication formula allows us to establish a stabilization property of the family of affine Schur algebras that leads to the modified version of an algebra ${\mathbf K}^{\mathfrak c}_n$. We show that ${\mathbf K}^{\mathfrak c}_n$ is a coideal subalgebra of quantum affine algebra ${\bf U}(\hat{\mathfrak{gl}}_n…
Quantum super Schur--Weyl duality and character formulas for mirabolic Hecke algebras
该研究建立了mirabolic Hecke代数的量子超Schur–Weyl对偶，推导了其不可约特征标的相关公式，还构造了超mirabolic RSK双射，并建立了其与q-rook幺半群代数的参数反转同构以转移相关结果。
The quiver Hecke algebra $R$ can be also understood as a generalization of the affine Hecke algebra of type $A$ in the context of the quantum affine Schur-Weyl duality by the results of Kang, Kashiwara and Kim. On the other hand, it is well-known that the Auslander-Reiten(AR) quivers $Γ_Q$ of finite simply-laced types have a deep relation with the positive roots systems of the corresponding types. In this paper, we present explicit combinatorial descriptions for the AR-quivers $Γ_Q$ of finite type $A$. Using the combinatorial descriptions, we can investigate relations between finite dimensiona…
Quantum imaginary Schur-Weyl duality
本文建立了任意参数下无扭仿射A型箭袋Hecke代数与对称群Iwahori-Hecke代数之间的对偶，推广了Kleshchev和Muth的虚Schur-Weyl对偶，并用于计算简单模和标准模的特征。
Affine Hecke and Schur algebras of type A without a square root of q
本文提出了一种无需q平方根的仿射细胞结构，用于类型A的仿射Hecke和Schur代数，以支持p-adic域上GL_n(F)的表示理论研究。
$(q,t)$-chromatic symmetric functions
本文利用仿射 Hecke 代数表示构造了单位区间图的 $(q,t)$-色对称函数，推广了 Kato 公式，并在 $q=1$ 时约化为色拟对称函数，给出 Stanley-Stembridge 猜想的代数证明及概率论解释。
On (super)symmetrizing forms and Schur elements of cyclotomic Hecke-Clifford algebras
本文引入了超对称化超代数的 Schur 元素，证明了 cyclotomic Hecke-Clifford 代数在特定条件下具有超对称性或对称性，并计算了半单情况下的 Schur 元素，同时定义了新的对称化形式。
In this paper the authors investigate the $q$-Schur algebras of type B that were constructed earlier using coideal subalgebras for the quantum group of type A. The authors present a coordinate algebra type construction that allows us to realize these $q$-Schur algebras as the duals of the $d$th graded components of certain graded coalgebras. Under suitable conditions an isomorphism theorem is proved that demonstrates that the representation theory reduces to the $q$-Schur algebra of type A. This enables the authors to address the questions of cellularity, quasi-hereditariness and representatio…
As a natural generalization quantum Schur algebras associated with the Hecke algebra of the symmetric group, we introduce the quantum Schur superalgebra of type Q associated with the Hecke-Clifford superalgebra, which, by definition, is the endomorphism algebra of the induced module over the Hecke-Clifford superalgebra from certain permutation modules over the Hecke algebra of the symmetric group. We will describe certain integral bases for these superalgebras in terms of matrices and will establish the base change property for them. We will also identify the quantum Schur superalgebra of type…
Let ${\mathsf F}$ be the Schur functor from the category of finite dimensional ${\mathcal H}_{\vartriangle}(r)_\mathbb C$-modules to the category of finite dimensional ${\mathcal S}_{\vartriangle}(n,r)_{\mathbb{C}}$-modules, where ${\mathcal H}_{\vartriangle}(r)_\mathbb C$ is the extended affine Hecke algebra of type $A$ over ${\mathbb C}$ and ${\mathcal S}_{\vartriangle}(n,r)_{\mathbb{C}}$ is the affine quantum Schur algebras over $\mathbb{C}$. The Drinfeld polynomials associated with ${\mathsf F}(V)$ were determined in \cite[7.6]{CP96} and \cite[4.4.2]{DDF} in the case of $n>r$, where $V$ is…
We construct a new basis for a slim cyclotomic $q$-Schur algebra $\cysSr$ via symmetric polynomials in Jucys--Murphy operators of the cyclotomic Hecke algebra $\cysHr$. We show that this basis, labelled by matrices, is not the double coset basis when $\cysHr$ is the Hecke algebra of a Coxeter group, but coincides with the double coset basis for the corresponding group algebra, the Hecke algebra at $q=1$. As further applications, we then discuss the cyclotomic Schur--Weyl duality at the integral level. This also includes a category equivalence and a classification of simple objects.
Asymptotic Schur algebras and cellularity of q-Schur algebras
本文证明了有限型 q-Schur 代数的胞腔性，推广了 Geck 的定理，并研究了渐近 Schur 代数的特殊模与 Schur 代数的左胞腔表示，推广了 Lusztig 的相关工作。
Schurian-finiteness of blocks of type $A$ Hecke algebras
本研究借助$\tau$-倾斜有限性与Schurian有限性的等价关系，证明$e\geq3$的$A$型Hecke代数中权重≥2的块为Schurian-无限的，还得到分次Scopes等价的结论。
Ribbon complexes for the 0-Hecke algebra
本文通过构造带状复形，证明了0-Hecke代数中射影模的Koszul性，并定义了斜射影模及其非交换Frobenius特征。
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