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arXiv · 1906.05109

Two-cocycles and cleft extensions in left braided categories

István Heckenberger·Kevin Wolf
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Abstract

We define two-cocycles and cleft extensions in categories that are not necessarily braided, but where specific objects braid from one direction, like for a Hopf algebra $H$ a Yetter-Drinfeld module braids from the left with $H$-modules. We will generalize classical results to this context and give some application for the categories of Yetter-Drinfeld modules and $H$-modules. In particular we will describe liftings of coradically graded Hopf algebras in the category of Yetter-Drinfeld modules with these techniques.

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István Heckenberger, Kevin Wolf. 2019-06-12. Two-cocycles and cleft extensions in left braided categories. https://arxiv.org/abs/1906.05109

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