Cohomology of abelian matched pairs and the Kac sequence

Details Cohomology of abelian matched pairs and the Kac sequence Cohomology of abelian matched pairs and the Kac sequence

2002-12-09

arxiv.org/abs/math/0212124v1

Mathematics

Rings and Algebras

29 pages

Scientific paper

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.

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