Hopf cocycles associated to pointed and copointed deformations over S3

The algebras in the classification of finite dimensional pointed and copointed Hopf algebras over the symmetric group on three letters are all Hopf cocycle deformations of their associated graded objects. We show that these cocycles are generically pure, namely they are not co-homologous to exponentials of Hochschild 2-cocycles; apart from very specific examples. We provide a full description of these cocycles on a given basis.

Publication Details

Journal
Conicet
Published
2025-03-01
Primary Topic
Algebraic structures and combinatorial models
Type
article
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article

Hopf cocycles associated to pointed and copointed deformations over S3

Conicet
Algebraic structures and combinatorial models
article

Hopf cocycles associated to pointed and copointed deformations over S3

article en

Abstract

The algebras in the classification of finite dimensional pointed and copointed Hopf algebras over the symmetric group on three letters are all Hopf cocycle deformations of their associated graded objects. We show that these cocycles are generically pure, namely they are not co-homologous to exponentials of Hochschild 2-cocycles; apart from very specific examples. We provide a full description of these cocycles on a given basis.

Conicet
Openalex Percentile: Top 25%
Algebraic structures and combinatorial models
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Hopf cocycles associated to pointed and copointed deformations over S3 · Conicet (2025) | TGRS Research Map | TGRS