Partial generalized crossed products and a seven term exact sequence (expanded version)

Mikhailo Dokuchaev; Itailma Rocha

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arXiv · 2105.01268

Partial generalized crossed products and a seven term exact sequence (expanded version)

Mikhailo Dokuchaev·Itailma Rocha

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Abstract

Given a non-necessarily commutative unital ring $R$ and a unital partial representation $\Theta $ of a group $G$ into the Picard semigroup $\mathbf{PicS} (R)$ of the isomorphism classes of partially invertible $R$-bimodules, we construct an abelian group $\mathcal{C}(\Theta /R) $ formed by the isomorphism classes of partial generalized crossed products related to $\Theta $ and identify an appropriate second partial cohomology group of $G$ with a naturally defined subgroup $\mathcal{C}_0(\Theta /R) $ of $\mathcal{C}(\Theta /R).$ Then we use the obtained results to give an analogue of the Chase-Harrison-Rosenberg exact sequence associated with an extension of non-necessarily commutative rings $R\subseteq S$ with the same unity and a unital partial representation $ G \to \mathcal{S}_R(S)$ of an arbitrary group $G$ into the monoid $\mathcal{S}_R(S)$ of the $R$-subbimodules of $S.$ This generalizes the works by Kanzaki and Miyashita.

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Mikhailo Dokuchaev, Itailma Rocha. 2021-05-04. Partial generalized crossed products and a seven term exact sequence (expanded version). https://arxiv.org/abs/2105.01268

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