箭图幂零包络代数的几何实现

Remarks on quantum unipotent subgroup and dual canonical basis

We prove the tensor product decomposition of the half of quantized universal enveloping algebra associated with a Weyl group element which was conjectured by Berenstein and Greenstein.

A realisation of the quantum linear superalgebra

We reconstruct the quantum enveloping superalgebra ${\bf U}(\mathfrak{gl}_{m|n})$ over $\mathbb Q(v)$ via (finite dimensional) quantum Schur superalgebras. In particular, we obtain a new basis containing the standard generators of ${\bf U}(\mathfrak{gl}_{m|n})$ and explicit multiplication formulas between the generators and an arbitrary basis element.

单侧理想与哈里-查恩双模

Unipotent Ideals and Harish-Chandra Bimodules

本文定义了单侧表示，通过nilpotent共轭轨道的有限等变覆盖，结合滤代数和泊松同构，证明了单侧理想和表示的性质，包括参数化和单位性。

Realisation of Lusztig cones

The negative part $U^-$ of a quantised enveloping algebra associated to a simple Lie algebra possesses a canonical basis $\mathcal{B}$ with favourable properties. Lusztig has associated a cone to a reduced expression $\mathbf{i}$ for the longest element $w_0$ in the Weyl group of $\mathfrak{g}$, with good properties with respect to monomial elements of $\mathcal{B}$. The first author has associated a subalgebra $A_{\mathbf{i}}$ of $U^-$, compatible with the dual basis $\mathcal{B}^*$, to each reduced expression $\mathbf{i}$. We show that, after a certain twisting, the string parametrisation of…

量子群的Drinfeld double、倾斜模与复反射群相关的$\u2124$-模数据

Drinfeld double of quantum groups, tilting modules and $\mathbb{Z}$-modular data associated to complex reflection groups

本研究推广Lusztig与Malle关于复反射群幺正特征标及$\u2124$-模数据的工作，通过研究单复李代数Borel子代数量子包络代数Drinfeld double的倾斜模范畴，构造了部分对应数据的范畴化。

Cluster algebra structures and semicanonical bases for unipotent groups

Let Q be a finite quiver without oriented cycles, and let $Λ$ be the associated preprojective algebra. To each terminal representation M of Q (these are certain preinjective representations), we attach a natural subcategory $C_M$ of $mod(Λ)$. We show that $C_M$ is a Frobenius category,and that its stable category is a Calabi-Yau category of dimension 2. Then we develop a theory of mutations of maximal rigid objects of $C_M$, analogous to the mutations of clusters in Fomin and Zelevinsky's theory of cluster algebras. We show that $C_M$ yields a categorification of a cluster algebra $A(C_M)$, wh…