报告一：
题目： Finite dimensional quasi-Hopf algebras of finite Cartan type
报告人：张印火 教授
单位： 比利时 Hasselt 大学
时间：9月10日下午3:30-4:30 地点： 四牌楼五四楼304会议室
摘要：
In this paper, we present a general method for constructing finite-dimensional quasi-Hopf algebras from finite abelian groups and braided vector spaces of Cartan type. The study of such quasi-Hopf algebras leads to the classification of finite-dimensional radically graded basic quasi-Hopf algebras over abelian groups with dimensions not divisible by $2,3,5,7$ and associators given by abelian $3$-cocycles. As special cases , the small quasi-quantum groups are introduced and studied. Many new explicit examples of finite-dimensional genuine quasi-Hopf algebras are obtained.
报告二：
题目：Reconstruction of tensor categories from their invariants
报告人：陈惠香 教授
单位： 扬州大学
时间：9月10日下午4:30-5:30 地点： 四牌楼五四楼304会议室
摘要：In this paper, we study the tensor categories of finite rank over an algebraically closed field
$\mathbb F$. Given a data $(R, A, \phi, a)$ with some conditions supposed on it, where $R$ is a $\mathbb{Z}_+$-ring of rank $n$ over $\mathbb Z$, $A$ is a finite dimensional $\mathbb F$-algebra with a full set of $n$ primitive orthogonal idempotents, $\phi$ is an algebra map from $A\otimes_{\mathbb F}A$ to an algebra $M(R, A, n)$ constructed by $A$ and $R$, and $a=\{a_{i,j,l}|1\< i,j,l\<n\}$ is a family of ``invertible matrices over $A$, we display a procedure to construct a Krull Schmidt and abelian tensor category $\mathcal C$ over $\mathbb F$ from $(R, A, \phi, a)$ such that $R$ is the Green ring of $\mathcal C$ and $A$ is the Auslander algebra of $\mathcal C$. In this case, $\mathcal C$ has finitely many indecomposable objects and finite dimensional Hom-spaces. We also give a sufficient and necessary condition for such two tensor categories to be tensor equivalent. Conversely, from any given Krull Schmidt and abelian tensor category $\mathcal C$ over $\mathbb F$ with finitely many indecomposable objects and finite dimensional Hom-spaces, one can get a data $(R, A, \phi, a)$ which satisfies all the conditions supposed in the procedure above such that $R$ and $A$ are the Green ring and the Auslander algebra of $\mathcal C$, respectively.
Moreover, it is shown that the new Krull Schmidt and abelian tensor category constructed from the data $(R, A, \phi, a)$ is tensor equivalent to the original category $\mathcal C$.
$\mathbb F$. Given a data $(R, A, \phi, a)$ with some conditions supposed on it, where $R$ is a $\mathbb{Z}_+$-ring of rank $n$ over $\mathbb Z$, $A$ is a finite dimensional $\mathbb F$-algebra with a full set of $n$ primitive orthogonal idempotents, $\phi$ is an algebra map from $A\otimes_{\mathbb F}A$ to an algebra $M(R, A, n)$ constructed by $A$ and $R$, and $a=\{a_{i,j,l}|1\< i,j,l\<n\}$ is a family of ``invertible matrices over $A$, we display a procedure to construct a Krull Schmidt and abelian tensor category $\mathcal C$ over $\mathbb F$ from $(R, A, \phi, a)$ such that $R$ is the Green ring of $\mathcal C$ and $A$ is the Auslander algebra of $\mathcal C$. In this case, $\mathcal C$ has finitely many indecomposable objects and finite dimensional Hom-spaces. We also give a sufficient and necessary condition for such two tensor categories to be tensor equivalent. Conversely, from any given Krull Schmidt and abelian tensor category $\mathcal C$ over $\mathbb F$ with finitely many indecomposable objects and finite dimensional Hom-spaces, one can get a data $(R, A, \phi, a)$ which satisfies all the conditions supposed in the procedure above such that $R$ and $A$ are the Green ring and the Auslander algebra of $\mathcal C$, respectively.
Moreover, it is shown that the new Krull Schmidt and abelian tensor category constructed from the data $(R, A, \phi, a)$ is tensor equivalent to the original category $\mathcal C$.
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