Abelian Ideals and Cohomology of Symplectic Type

Cohomology of abelian matched pairs and the Kac sequence

The purpose of this paper is to introduce a cohomology theory for abelian matched pairs of Hopf algebras and to explore its relationship to Sweedler cohomology, to Singer cohomology and to extension theory. An exact sequence connecting these cohomology theories is obtained for a general abelian matched pair of Hopf algebras, generalizing those of Kac and Masuoka for matched pairs of finite groups and finite dimensional Lie algebras. The morphisms in the low degree part of this sequence are given explicitly, enabling concrete computations.

A BV-algebra Structure on Hochschild Cohomology of the Group Ring of Finitely Generated Abelian Groups

We study a Batalin-Vilkovisky algebra structure on the Hochschild cohomology of the group ring of finitely generated abelian groups. The Batalin-Vilkovisky algebra structure for finite abelian groups comes from the fact that the group ring of finite groups is a symmetric algebra, and the Batalin-Vilkovisky algebra structure for free abelian groups of finite rank comes from the fact that its group ring is a Calabi-Yau algebra.

Non-Abelian Hopf Cohomology

We introduce non-abelian cohomology sets of Hopf algebras with coefficients in Hopf modules. We prove that these sets generalize Serre's non-abelian group cohomology theory. Using descent techniques, we establish that our construction enables to classify as well twisted forms for modules over Hopf-Galois extensions as torsors over Hopf-modules.

Nijenhuis李代数的非阿贝尔上同调以及自同构与导子的可诱导性

Non-abelian cohomology of Nijenhuis Lie algebras and the inducibility of automorphisms and derivations

该研究引入Nijenhuis李代数的非阿贝尔上同调群，给出其非阿贝尔扩张同构类的参数化与阿贝尔扩张分类，并刻画了自同构、导子可诱导性的上同调阻碍。